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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 432 (1977), S. 51-57 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation, Crystal and Molecular Structure of Diphenyltin Glycylglycinate, (C6H5)2SnC4H6N2O3The title compound has been prepared from (C6H5)2SnO and Glycylglycine (H2GlyGly) in methanol. It crystallizes in the orthorhombic space group P212121 with a = 9.860(5), b = 11.787(8), c = 13.962(2) Å and Z = 4. The crystal structure has been determined from 1 109 independent reflections by Patterson and Fourier syntheses, and has been refined by least squares methods to R = 0.033. The (C6H5)2SnGlyGly molecules essentially form a heavily distorted trigonal bipyramid with peptide-N and the phenyl C-atoms bonded to Sn occupying the equatorial positions. The tridentate GlyGly ligand is practically planar coordinating through one carboxylate-O, peptide-N and amine-N. The single molecules are bridged by H-bonds between amine-N and carbonyl-O of the peptide-group and also carboxylate-O (not bonded to Sn). Important intramolecular bond distances and angles: see above.
    Notes: Die Titelverbindung wurde durch Umsetzung von (C6H5)2SnO mit Glycylglycin (H2GlyGly) in Methanol dargestellt. Sie kristallisiert orthorhombisch in der Raumgruppe P212121 mit a = 9,860(5), b = 11,787(8), c = 13,962(2) Å und Z = 4. Die Kristallstruktur wurde anhand von 1 109 unabhängigen Reflexen mittels Patterson- und Fourier-Synthesen bestimmt und nach der Kleinste-Quadrate-Methode bis zu einem R-Wert von 0,033 verfeinert. Die (C6H5)2SnGlyGly-Molekeln besitzen die Grundstruktur einer stark verzerrten trigonalen Bipyramide; Peptid-N und die beiden an Sn gebundenen Phenyl-C-Atome liegen äquatorial. Der dreizähnige GlyGly-Ligand ist praktisch planar und koordiniert über ein Carboxylat-O, sowie Peptid-N und Amin-N. Die Einzelmolekel sind über H-Brücken zwischen Amin-N und Carbonyl-O der Peptidgruppierung, sowie Carboxylat-O (nicht an Sn gebunden) verknüpft. Wichtige intramolekulare Abstände und Winkel: Sn—O: 2,157(8); Sn—N (Peptid): 2,082(8); Sn—N (Amin): 2,273(9); Sn—C: 2,113(9) (Mittelwert); C—N (Peptidgruppe): 1,330(13); C—N (Amin): 1,457(15) bzw. 1,499(14); C—Sn—C: 117,54(30); N—Sn—N 77,57(32); N(Peptid)—Sn—O: 75,71(31); C—Sn—N(Peptid): 121,1(3) (Mittelwert); C—N(Peptid)—C 119,47(91).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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