John, Michael

[["dc.bibliographiccitation.firstpage","10049"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","Inorganic Chemistry"],["dc.bibliographiccitation.lastpage","10059"],["dc.bibliographiccitation.volume","48"],["dc.contributor.author","Stollenz, Michael"],["dc.contributor.author","John, Michael"],["dc.contributor.author","Gehring, Henrike"],["dc.contributor.author","Dechert, Sebastian"],["dc.contributor.author","Grosse, Christian"],["dc.contributor.author","Meyer, Franc"],["dc.date.accessioned","2018-11-07T11:22:18Z"],["dc.date.available","2018-11-07T11:22:18Z"],["dc.date.issued","2009"],["dc.description.abstract","The synthesis of three pyrazole-based, potentially binucleating ligands 3,5-bis(R(1)N(CH(3))CH(2))-4-R(2)pyrazole (L(1)H: R(1) pyridyl-2-methyl-, R(2) = Ph; L(2)H: R(1) = 8-quinolyl-, R(2) = H; L(3)H: R(1) = 8-quinolyl-, R(2) = Ph) is described. Reaction of L(1-3)H with 1 equiv. of mesitylcopper affords oligonuclear homoleptic complexes of the type [CuL](n) (1-3). The single crystal X-ray structure of 2 shows a tetranuclear assembly of linear coordinated copper(I)-centers bridged by pyrazolato ligands that alternate above and below the Cu(4) plane, with additional weak interactions from some of the ligand side arms. As the single crystal X-ray structure of 3 reveals, phenyl substitution at the 4-position of the pyrazolato framework leads to significant structural modification of the Cu(4) array, giving a rhombical tetranuclear complex with two linear coordinated copper(I) centers that exhibit a short intramolecular Cu:: center dot Cu contact (2.8212(10) angstrom) and two peripheral copper(I) centers in a distorted tetrahedral coordination mode. Thus, 3 represents a very rare example of an inorganic pyrazolato cuprate which can also be viewed as a partly rearranged structural isomer of 2. Furthermore, the crystal lattice of 3 shows an extended network of intra- and intermolecular pi-pi stacking interactions between the aromatic rings. In solution, 1-3 each form two types of oligomers a and b that slowly (<1 s(-1)) equilibrate at room temperature. Using Diffusion Ordered Spectroscopy (DOSY) and variable temperature (1)H NMR spectroscopy it can be shown that a and b correspond to a tetrameric and a (planar) trimeric species. Coordination of the pyridyl/quinolyl side arms that is observed in the solid state seems to be only transient in solution."],["dc.description.sponsorship","Fonds der Chernischen Industrie"],["dc.identifier.doi","10.1021/ic900727h"],["dc.identifier.isi","000270987400019"],["dc.identifier.pmid","19803532"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/55964"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","0020-1669"],["dc.title","Oligonuclear Homoleptic Copper(I) Pyralzolates with Multinucleating Ligand Scaffolds: High Structural Diversity in Solid-State and Solution"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","337"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","European Journal of Organic Chemistry"],["dc.bibliographiccitation.lastpage","349"],["dc.bibliographiccitation.volume","2015"],["dc.contributor.author","Mitronova, Gyuzel Yu"],["dc.contributor.author","Polyakova, Svetlana"],["dc.contributor.author","Wurm, Christian Andreas"],["dc.contributor.author","Kolmakov, Kirill"],["dc.contributor.author","Wolfram, Thomas"],["dc.contributor.author","Meineke, Dirk N. H."],["dc.contributor.author","Belov, Vladimir N."],["dc.contributor.author","John, Michael"],["dc.contributor.author","Hell, Stefan"],["dc.date.accessioned","2017-09-07T11:44:46Z"],["dc.date.available","2017-09-07T11:44:46Z"],["dc.date.issued","2015"],["dc.description.abstract","Aromatic nucleophilic substitution (SNAr) of fluorine in 9-(3'-carboxy-4',5',6',7'-tetrafluorophenyl) groups of xanthene dyes constitutes a powerful tool in dye design. Thiols and amines regioselectively replace F-6'. This approach enables additional hydrophilic residues or functional groups required for bioconjugation to be introduced. By using this methodology, a \"bright\" and photostable dye for two-color superresolution microscopy was synthesized (with absorption and emission maxima at 604 and 627 nm, respectively). In the case of red-emitting rhodamine dyes with 3'-carboxy-4',5',7'-trifluorophenyl residues, two-dimensional NMR techniques and a chemical transformation were used to prove the precise position of the additional substituent - a carboxylic acid group linked through the S-atom at C-6'. Furthermore, simple H-1 NMR spectra reliably permit the position of the additional carboxy substituent in the 3'-carboxyphenyl ring (at C-5' or C-6') to be established. Information on the exact position of this substituent is significant for the design of molecular probes and for the prediction of the properties of their bioconjugates."],["dc.identifier.doi","10.1002/ejoc.201403269"],["dc.identifier.gro","3141988"],["dc.identifier.isi","000347722900011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/3301"],["dc.language.iso","en"],["dc.notes.intern","WoS Import 2017-03-10"],["dc.notes.status","final"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.eissn","1099-0690"],["dc.relation.issn","1434-193X"],["dc.title","Functionalization of the meso-Phenyl Ring of Rhodamine Dyes Through SNAr with Sulfur Nucleophiles: Synthesis, Biophysical Characterizations, and Comprehensive NMR Analysis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","796"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","ChemCatChem"],["dc.bibliographiccitation.lastpage","805"],["dc.bibliographiccitation.volume","5"],["dc.contributor.author","Saha, Tapan Kumar"],["dc.contributor.author","Frauendorf, Holm"],["dc.contributor.author","John, Michael"],["dc.contributor.author","Dechert, Sebastian"],["dc.contributor.author","Meyer, Franc"],["dc.date.accessioned","2018-11-07T09:27:35Z"],["dc.date.available","2018-11-07T09:27:35Z"],["dc.date.issued","2013"],["dc.description.abstract","Dyes in wastewater severely affect the nature and quality of water by inhibiting the sunlight penetration into the stream, which thereby reduces the photosynthesis reaction. This poses a serious environmental threat in many developing countries. Recently, new methods for the treatment of colored dye effluent streams have attracted much attention. The [MnIII(tmpyp)]/H2O2 system (tmpyp=meso-tetrakis(1-methylpyridinium-4-yl)porphyrinato) was now found to degrade various azo dyes with remarkably high efficiency under ambient conditions in aqueous solution at certain pH values. Main products of the catalytic degradation of the dye amaranth by [MnIII(tmpyp)]/H2O2 were analyzed. The reaction mechanism was studied in more detail by using rapid-scan stopped-flow spectrophotometry as a function of pH, [catalyst], [H2O2], [dye], and [surfactants]. Spectral analyses and kinetic data suggested rapid formation of an intermediate [MnIII(tmpyp)(OOH)] (a compound 0-type intermediate), followed by the formation of a relatively stable trans-dioxomanganese(V) porphyrin complex, [MnV(O)2(tmpyp)] (a compoundI analog). The one-electron reduction of [MnV(O)2(tmpyp)] to [MnIV(O)(tmpyp)] (a compoundII analog) was accelerated greatly by amaranth. On the basis of the kinetic and spectroscopic data, a reaction mechanism of the formation of reactive intermediates [MnIII(tmpyp)(OOH)], [MnV(O)2(tmpyp)], and [MnIV(O)(tmpyp)] was proposed."],["dc.description.sponsorship","Alexander von Humboldt Foundation"],["dc.identifier.doi","10.1002/cctc.201200475"],["dc.identifier.isi","000315416200026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30572"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","1867-3880"],["dc.title","Efficient Oxidative Degradation of Azo Dyes by a Water-Soluble Manganese Porphyrin Catalyst"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5146"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Organometallics"],["dc.bibliographiccitation.lastpage","5151"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Scheele, Ulrich Juergen"],["dc.contributor.author","Georgiou, Maria"],["dc.contributor.author","John, Michael"],["dc.contributor.author","Dechert, Sebastian"],["dc.contributor.author","Meyer, Franc"],["dc.date.accessioned","2018-11-07T11:10:05Z"],["dc.date.available","2018-11-07T11:10:05Z"],["dc.date.issued","2008"],["dc.description.abstract","Reaction of Ag2O with the N-heterocyclic carbene (NHC) precursors 3,5-bis[3-(2,4,6-trimethylphenyl)imidazolium-1-ylmethyl]-1H-pyrazole bishexafluorophosphate (1a) and 3,5-bis[3-(2,6-diisopropylphenyl)imidazolium-1-ylmethyl]-1H-pyrazole bishexafluorophosphate (1b) yielded silver(l) complexes 2 and 3, respectively. X-ray crystallography revealed a tetranuclear dimeric solid state structure in the case of 2, whereas an unprecedented octanuclear tetrameric \"double-crown\"-like structure was found for 3, presumably due to the slightly bulkier ligand. Unlike 2, complex 3 is not stable in solution but in equilibrium with tetranuclear and hexanuclear complexes 4 and 5, respectively. The identity of those species could be elucidated by detailed NMR spectroscopic studies (H-1, C-13, N-15, Ag-109, and DOSY experiments), which also provide valuable benchmark data for correlating (1)J(AgN) couplings and Ag-109 chemical shifts with structural information."],["dc.description.sponsorship","Fonds der Chemischen Industrie"],["dc.identifier.doi","10.1021/om800487e"],["dc.identifier.isi","000259604200043"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53140"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","0276-7333"],["dc.title","Combining pyrazolate and N-heterocyclic carbene coordination motifs: Synthesis and characterization of a double-crowned silver complex"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1083"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Glia"],["dc.bibliographiccitation.lastpage","1099"],["dc.bibliographiccitation.volume","63"],["dc.contributor.author","Menzfeld, Christiane"],["dc.contributor.author","John, Michael"],["dc.contributor.author","van Rossum, Denise"],["dc.contributor.author","Regen, Tommy"],["dc.contributor.author","Scheffel, Joerg"],["dc.contributor.author","Janova, Hana"],["dc.contributor.author","Goetz, Alexander A."],["dc.contributor.author","Ribes, Sandra"],["dc.contributor.author","Nau, Roland"],["dc.contributor.author","Borisch, Angela"],["dc.contributor.author","Boutin, Philippe"],["dc.contributor.author","Neumann, Konstantin"],["dc.contributor.author","Bremes, Vanessa"],["dc.contributor.author","Wienands, Juergen"],["dc.contributor.author","Reichardt, Holger Michael"],["dc.contributor.author","Luehder, Fred"],["dc.contributor.author","Tischner, Denise"],["dc.contributor.author","Waetzig, Vicky"],["dc.contributor.author","Herdegen, Thomas"],["dc.contributor.author","Teismann, Peter"],["dc.contributor.author","Greig, Iain"],["dc.contributor.author","Mueller, Michael"],["dc.contributor.author","Pukrop, Tobias"],["dc.contributor.author","Mildner, Alexander"],["dc.contributor.author","Kettenmann, Helmut"],["dc.contributor.author","Brueck, Wolfgang"],["dc.contributor.author","Prinz, Marco R."],["dc.contributor.author","Rotshenker, Shlomo"],["dc.contributor.author","Weber, Martin S."],["dc.contributor.author","Hanisch, Uwe-Karsten"],["dc.date.accessioned","2018-11-07T09:56:53Z"],["dc.date.available","2018-11-07T09:56:53Z"],["dc.date.issued","2015"],["dc.description.abstract","The putative protein tyrosine kinase (PTK) inhibitor tyrphostin AG126 has proven beneficial in various models of inflammatory disease. Yet molecular targets and cellular mechanisms remained enigmatic. We demonstrate here that AG126 treatment has beneficial effects in experimental autoimmune encephalomyelitis (EAE), a model for multiple sclerosis. AG126 alleviates the clinical symptoms, diminishes encephalitogenic Th17 differentiation, reduces inflammatory CNS infiltration as well as microglia activation and attenuates myelin damage. We show that AG126 directly inhibits Bruton's tyrosine kinase (BTK), a PTK associated with B cell receptor and Toll-like receptor (TLR) signaling. However, BTK inhibition cannot account for the entire activity spectrum. Effects on TLR-induced proinflammatory cytokine expression in microglia involve AG126 hydrolysis and conversion of its dinitrile side chain to malononitrile (MN). Notably, while liberated MN can subsequently mediate critical AG126 features, full protection in EAE still requires delivery of intact AG126. Its anti-inflammatory potential and especially interference with TLR signaling thus rely on a dual mechanism encompassing BTK and a novel MN-sensitive target. Both principles bear great potential for the therapeutic management of disturbed innate and adaptive immune functions. GLIA 2015;63:1083-1099"],["dc.identifier.doi","10.1002/glia.22803"],["dc.identifier.isi","000353244400011"],["dc.identifier.pmid","25731696"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37056"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1098-1136"],["dc.relation.issn","0894-1491"],["dc.title","Tyrphostin AG126 Exerts Neuroprotection in CNS Inflammation by a Dual Mechanism"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","6070"],["dc.bibliographiccitation.issue","19"],["dc.bibliographiccitation.journal","Chemistry – A European Journal"],["dc.bibliographiccitation.lastpage","6076"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Grimm, Florian"],["dc.contributor.author","Rehman, Jasmin"],["dc.contributor.author","Stoldt, Stefan"],["dc.contributor.author","Khan, Taukeer A."],["dc.contributor.author","Schlötel, Jan Gero"],["dc.contributor.author","Nizamov, Shamil"],["dc.contributor.author","John, Michael"],["dc.contributor.author","Belov, Vladimir N."],["dc.contributor.author","Hell, Stefan W."],["dc.date.accessioned","2021-06-01T09:41:16Z"],["dc.date.available","2021-06-01T09:41:16Z"],["dc.date.issued","2021"],["dc.identifier.doi","10.1002/chem.202005134"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/84865"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.eissn","1521-3765"],["dc.relation.issn","0947-6539"],["dc.title","Rhodamines with a Chloronicotinic Acid Fragment for Live Cell Superresolution STED Microscopy "],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1542"],["dc.bibliographiccitation.issue","11-12"],["dc.bibliographiccitation.journal","Zeitschrift für Naturforschung B"],["dc.bibliographiccitation.lastpage","1552"],["dc.bibliographiccitation.volume","64"],["dc.contributor.author","Georgiou, Maria"],["dc.contributor.author","Wöckel, Simone"],["dc.contributor.author","Konstanzer, Vera"],["dc.contributor.author","Dechert, Sebastian"],["dc.contributor.author","John, Michael"],["dc.contributor.author","Meyer, Franc"],["dc.date.accessioned","2020-11-05T14:37:47Z"],["dc.date.available","2020-11-05T14:37:47Z"],["dc.date.issued","2009"],["dc.description.abstract","A set of pyrazole-bridged bis(imidazolium) compounds [H(3)L(1)]X(2) - [H(3)L(4)]X(2) (L(1) = 3,5-bis[1-(tert-butyl)imidazolium-1-ylmethyl]-1H-pyrazole; L(2) = 3,5-bis[1-(tert-butyl)imidazolium-1-ylmethyl]-4-phenyl-1H-pyrazole; L(3) = 3,5-bis[1-(1-adamantyl)imidazolium-1-ylmethyl]-1H-pyrazole; L(4) = 3,5-bis[1-(1-adamantyl)imidazolium-1-ylmethyl]-4-phenyl-1H-pyrazole; X = Cl(-). BF(4)(-) or PF(6)(-)) has been prepared, and three compounds have been characterized by X-ray crystallography. The unique [H(3)L(4)][H(2)L(4)](PF(6))(3) features a dimeric face-to-face arrangement of two molecules due to the involvement of both the pyrazole-NH and the imidazolium C(2)H in hydrogen bonding. [H(3)L(1)]X(2) - [H(3)L(4)]X(2) serve as precursors for silver(I) complexes with compartmental pyrazolate-bridged bis(NHC) ligands. The complexes have been readily prepared by the Ag(2)O route and feature either the known [(L(1-4))(2)Ag(4)](2+) or the new [(H(2)L(1))(4)Ag(4)](8+) motif, depending on the solvent for the reaction (MeCN or acetone). [(H(2)L(1))(4)Ag(4)](PF(6))(8) contains a central (pzAg)(4) ring with pendant imidazolium side arms. Upon further reaction with Ag(2)O in MeCN it was found to undergo transformation to the corresponding [(L(1))(2)Ag(4)](PF(6))(2). All complexes have been thoroughly studied by NMR spectroscopy in solution, and preliminary luminescence data of [(H(2)L(1))(4)Ag(4)](PF(6))(8) have been recorded."],["dc.identifier.doi","10.1515/znb-2009-11-1238"],["dc.identifier.isi","000273712900038"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/68196"],["dc.notes.intern","DOI Import GROB-352"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Verlag Z Naturforsch"],["dc.relation.eissn","1865-7117"],["dc.relation.issn","0932-0776"],["dc.title","Structural Variations in Tetrasilver(I) Complexes of Pyrazolate-bridged Compartmental N-Heterocyclic Carbene Ligands"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2563"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Organometallics"],["dc.bibliographiccitation.lastpage","2567"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Jana, Anukul"],["dc.contributor.author","Sarish, Sankaranarayana Pillai"],["dc.contributor.author","Roesky, Herbert W."],["dc.contributor.author","Schulzke, Carola"],["dc.contributor.author","Doering, Alexander"],["dc.contributor.author","John, Michael"],["dc.date.accessioned","2018-11-07T08:30:40Z"],["dc.date.available","2018-11-07T08:30:40Z"],["dc.date.issued","2009"],["dc.description.abstract","The reaction of I equiv of beta-diketiminate lithium, LLi center dot OEt(2) {L = HC(CMeNAr)(2) (Ar = 2,6-iPr(2)C(6)H(3)) nacnac ligand} with I equiv of PbCl(2) in THF afforded the beta-diketiminate lead(II) chloride (1) as a yellow compound. Treatment of I with stoichiometric amounts of methyl lithium, phenyl lithium, lithium phenylacetylide, and silver triflate resulted in the divalent organolead compounds LPb(II)Me (2), LPb(11)Ph (3), LPb(II)CCPh (4), and LPb(II)OTf (5). Compounds 2 and 3 are the first stable, monomeric lead(II) derivatives involving small alkyl and aryl groups Me and Ph, respectively, supported by the beta-diketiminate ligand. Compound 4 is the first alkynyl lead(II) derivative. All compounds (2, 3, 4, 5) were characterized by microanalysis, X-ray crystallography, and (1)H, (13)C, and (207)Pb NMR spectroscopy. Single-crystal X-ray structural analyses indicate that compounds 2-4 are monomeric, and the lead center resides in a trigonal-pyramidal environment, whereas 5 has a polymeric structure. The results demonstrate the effectiveness of the beta-diketiminate ligand in creating a protected surrounding for the lead atom."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft"],["dc.identifier.doi","10.1021/om801167c"],["dc.identifier.isi","000265383700026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16945"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Chemical Soc"],["dc.relation.issn","0276-7333"],["dc.title","Facile Access of Well-Defined Stable Divalent Lead Compounds with Small Organic Substituents"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Glia"],["dc.bibliographiccitation.volume","57"],["dc.contributor.author","Menzfeld, Christiane"],["dc.contributor.author","John, Michael"],["dc.contributor.author","Neumann, K."],["dc.contributor.author","Tischner, Denise"],["dc.contributor.author","Wienands, Juergen"],["dc.contributor.author","Reichardt, Holger Michael"],["dc.contributor.author","Luehder, Fred"],["dc.contributor.author","Brueck, Wolfgang"],["dc.contributor.author","Rotshenker, Shlomo"],["dc.contributor.author","Hanisch, Uwe-Karsten"],["dc.date.accessioned","2018-11-07T11:23:41Z"],["dc.date.available","2018-11-07T11:23:41Z"],["dc.date.issued","2009"],["dc.format.extent","S66"],["dc.identifier.isi","000270075500275"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56240"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-liss"],["dc.publisher.place","Hoboken"],["dc.relation.conference","9th European Meeting on Glial Cells in Health and Disease"],["dc.relation.eventlocation","Paris, FRANCE"],["dc.relation.issn","0894-1491"],["dc.title","TYRPHOSTIN AG126 MODULATES TOLL-LIKE RECEPTOR (TLR)-ACTIVATED RESPONSES IN MICROGLIA"],["dc.type","conference_abstract"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2114"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Chemistry - A European Journal"],["dc.bibliographiccitation.lastpage","2121"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Freye, Sabrina"],["dc.contributor.author","Engelhard, David M."],["dc.contributor.author","John, Michael"],["dc.contributor.author","Clever, Guido H."],["dc.date.accessioned","2018-11-07T09:28:35Z"],["dc.date.available","2018-11-07T09:28:35Z"],["dc.date.issued","2013"],["dc.description.abstract","In solution, the eight BF4 counterions of a positively charged D4-symmetric interpenetrated [Pd4ligand8]8+ double cage (1) are localized in distinct positions. At low temperatures, one BF4 ion is encapsulated inside the central pocket of the supramolecular structure, two BF4 ions are bound inside the equivalent outer pockets, and the remaining five BF4 ions are located outside the cage structure (expressed by the formula [3BF4@1][BF4]5). On warming, the two BF4 ions in the outer pockets are found to exchange with the exterior ions in solution whereas the central BF4 ion stays locked inside the central cavity (here written as [BF4@1][BF4]7). The exchange kinetics were determined by exchange spectroscopy (EXSY) NMR experiments and line-shape fitting in different solvents. The tremendously high affinity of this double cage for the binding of two chloride ions inside the outer pockets allows for complete exchange of two BF4 ions by the addition of solid AgCl to give [2Cl+BF4@1][BF4]5. The uptake of the two chloride ions is allosteric and is thus accompanied by a structural rearrangement (compression along the Pd4 axis) of the double cage structure. An analysis by using 900MHz NOESY NMR spectroscopy shows that this compression of about 3.3% is associated with a helical twist of 8 degrees, which together resemble a screw motion. As a consequence of squeezing each of the outer two pockets by 53%, the volume of the central pocket is increased by 43%, which results in an increase of 36% in the 19F spin-lattice relaxation time (T1) of the central BF4 ion. The packing coefficients (PC) for the ions in the outer pockets (103% for BF4 and 96% for Cl) were calculated."],["dc.description.sponsorship","DFG; Fonds der Chemischen Industrie"],["dc.identifier.doi","10.1002/chem.201203086"],["dc.identifier.isi","000314217100032"],["dc.identifier.pmid","23255121"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30814"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-v C H Verlag Gmbh"],["dc.relation.issn","0947-6539"],["dc.title","Counterion Dynamics in an Interpenetrated Coordination Cage Capable of Dissolving AgCl"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]