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  • 1995-1999  (2)
  • 1975-1979  (1)
  • Inorganic Chemistry  (2)
  • Histidine  (1)
  • X-ray structural analysis
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  • 1
    ISSN: 1432-1327
    Keywords: Key words Platinum(II) ; Migration ; Oligopeptides ; Methionine ; Histidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The pH- and time-dependent reaction of [Pt(dien)(H2O)]2+ with the methionine- and histidine-containing peptides H-His-Gly-Met-OH and Ac-His-Ala-Ala-Ala-Met-NHPh at 313 K has been investigated by HPLC and NMR spectroscopy. For both peptides, initial relatively rapid formation of the kinetically favoured methionine S-bound complex is followed by slow intramolecular migration of the [Pt(dien)]2+ fragment to imidazole Nε 2 (or, in the case of H-His-Gly-Met-OH, to a much lesser extent to the competing imidazole Nδ 1) of the histidine side chain over a period of 500 h. Time-dependent studies for the pentapeptide at pH 8.0 demonstrate that this isomerization can take place by either direct S→Nε 2 migration or by a two-step mechanism involving initial Nε 2 coordination of a second [Pt(dien)]2+ fragment and subsequent cleavage of the orginal Pt-S bond in the resulting dinuclear complex. The rate of κS/κN ε 2 isomerization is markedly reduced on lowering the pH to 5.1.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Copper(I) halides ; tetramethylcyclotetraarsoxane complexes ; lamellar structures ; framework structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetramethylcyclotetraarsoxan-verbrückte Kupfer(I)-Halogenide mit porösen Schicht- und Raumnetz-Strukturen ∞2[CuX{cyclo-(MeAsO)4}] (X=Cl, Br, I) und ∞3[Cu3X3{cyclo-(MeAsO)4}2] (X=Cl, Br)Offene Schicht- und Raumnetzstrukturen von ∞2[CuX{cyclo-(MeAsO)4}] (X=Cl, Br, I) 1-3 und ∞3[Cu3X3{cyclo-(MeAsO)4}2] (X=Cl, Br) 4 und 5 können durch Selbstorganisation aus CuX und Methylcycloarsoxan (MeAsO)n in Acetonitril erhalten werden. 1-3 bilden 44-Netze, in denen (CuX)2-Einheiten durch μ-KAs1 : 2 KAs3 - koordinierte (MeAsO)4-Liganden zu großen 28-zähligen Ringen verbunden sind. Im Gegensatz dazu sind parallel angeordnete ∞1[CuX]-Ketten in 4 und 5 durch μ4-K4As-koordinierte (MeAsO)4-Gruppen zu Schichten verbunden, die durch μ-1 kAs1 : 2 kAs3-Verbrückung mit (MeAsO)4-Cyclotetrameren zur Bildung einer porösen Raumnetzstruktur führen. 1-5 wurden mittels Röntgenstrukturanalyse charakterisiert.
    Notes: Open sheet and framework structures ∞2[CuX{cyclo-(MeAsO)4}] (X=Cl, Br, I) 1-3 and ∞3[Cu3X3{cyclo-(MeAsO)4}2] (X=Cl, Br) 4 and 5 may be prepared by self-assembly from CuX and methylcycloarsoxane (MeAsO)n in acetonitrile solution. 1-3 exhibit 44 nets in which (CuX)2 units are connected through μ-1 KAs1 : 2 KAs3 coordinated (MeAsO)4 ligands into large 28-membered rings. In contrast, adjacent ∞1[CuX] chains in 4 and 5 are connected into sheets by μ4-K4 As coordinated (MeAsO)4 building blocks, with μ-1 KAs1 : 2 KAs3 bridging of these layers by independent (MeAsO)4 cyclotetramers leading to the generation of a porous framework structure. 1-5 were characterised by X-ray structural analysis.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 415 (1975), S. 43-50 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure of Diaza-diphosphetidin, [(C6F5)F2P—NCH3]2The synthesis, n. m. r. spectra and crystal structure of the diaza-diphosphetidin, [(C6F5)F2P—NCH3]2, are reported.
    Notes: Die Darstellung, Kernresonanzspektren und Kristallstruktur des Diaza-diphosphetidins, [(C6F5)F2P—NCH3]2, wird beschrieben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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