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  • 1
    Electronic Resource
    Electronic Resource
    [Pt(dien)]2+ migrates intramolecularly from methionine S to imidazole Nz 2 in the peptides H-His-Gly-Met-OH and Ac-His-Ala-Ala-Ala-Met-NHPh (1999)
    Springer
    JBIC 4 (1999), S. 412-420 
    Details
    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
    URL: http://dx.doi.org/10.1007/s007750050327
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von Alkalimetaselenoarseniten Darstellung und Kristallstrukturen von MAsSe2, M = K, Rb, Cs (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 561 (1988), S. 139-148 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Concerning Alkali Metal Metaselenoarsenites. Preparation and Crystal structures of MAsSe2, M = K, Rb, CsThe metaselenoarsenites MAsSe2, M = K, Rb, Cs were prepared by methanolothermal reaction of M2CO3 with As2Se3 at a temperature of 130°C. Their X-ray structural analyses demonstrated that the compounds contain polymetaselenoarsenite anions [AsSe2-]∞, in which the basic units are ψ-AsSe3 tetrahedra, which are linked via shared corners into infinite chains. Vierer single chains are observed for KAsSe2 and RbAsSe2, zweier single chains for CsAsSe2. The stretching units s are respectively 3,157, 2.336 and 3,378 Å. The relationship between the conformation of metaselenoarsenite chains and cation size is discussed.
    Notes: Die Metaselenoarsenite MAsSe2, M = K, Rb, Cs wurden durch methanolothermale Reaktion von M2CO3 mit As2Se3 bei einer Temperatur von 130°C dargestellt. Ihre Röntgenstrukturanalysen ergaben, daß die Verbindungen Polymetaselenoarsenit-Anionen [AsSe2-]∞ beinhalten, in denen die Grundelemente ψ-AsSe3-Tetraeder sind, die über gemeinsame Ecken zu unendlichen Ketten verknüpft sind. Für KAsSe2 und RbAsSe2 werden Vierer-, für CsAsSe2 Zweier-Einfachketten gefunden. Die Streckungseinheiten s betragen 3,157, 2,336 bzw. 3,378 Å. Die Beziehung zwischen Konformation von Metaselenoarsenitketten und Kationgröße wird erläutert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885610115
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von Cs4Sn5S12 · 2 H2O, ein Cäsium(I)-thiostannat(IV) mit fünf- und sechsfach koordiniertem Zinn (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 23-30 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Cs4Sn5S12 · 2 H2O, a Cesium(I) Thiostannate(IV) with Fivefold and Sixfold Coordinated TinCs4Sn5S12 · 2 H2O was prepared by hydrothermal reaction of Cs2CO3 with SnS2 at a temperature of 130°C. An X-ray structural analysis demonstrated that the compound contains polythiostannate(IV) sheet anions [Sn5S124-]∞, for which the basic elements are trigonal SnS5-bipyramids and SnS6-octahedra. Five of the six independent sulphur atoms in the asymmetric unit are coordinated by two tin atoms, one by three tin atoms.
    Notes: Cs4Sn5S12 · 2 H2O wurde durch hydrothermale Reaktion von Cs2CO3 mit SnS2 bei einer Temperatur von 130°C dargestellt. Eine Röntgenstrukturanalyse ergab, daß die Verbindung schichtartige Polythiostannat(IV)-Anionen [Sn5S124-]∞ beinhaltet, in denen die Grundelemente trigonale SnS5-Bipyramide sowie SnS6-Oktaeder sind. Von den sechs unabhängigen Schwefelatomen der asymmetrischen Einheit werden fünf zweimal und eins dreimal von Zinnatomen koordiniert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885620104
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur von Tetraethylcyclotetraarsoxan-Komplexen von Kupfer(I)-Halogeniden (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 334-342 
    Details
    ISSN: 0044-2313
    Keywords: Copper(I) halide complexes ; tetraethylcyclotetraarsoxane copper(I) complexes ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Structure of Tetraethylcyclotetraarsoxane Complexes of Copper(I) HalidesThe polymeric complexes [Cu4Cl4{cyclo-(C2H5AsO)4}3]n (1), [Cu3Br3{cyclo-(C2H5AsO)4}2]n (2) and [Cu6I6{cyclo-(C2H5AsO)4}3]n (3) were prepared by the reaction of (C2H5AsO)n and CuX (X = Cl, Br, I) in acetonitrile and characterised by X-ray analysis. All three complexes contain only tetramers (C2H5AsO)4 as ligands, in which the As4O4 ring systems coordinate between two and four Cu-atoms. In each case one As4O4 ring with a crown-shaped conformation is observed, which coordinates either four (in 1) or three (in 2 and 3) axially sited Cu-atoms. In addition there are further (C2H5AsO)4 ligands, which display either a boat-chair- (in 1) or a twist-chair-conformation (in 1-3). The individual building units are connected to one another via Cu—X—Cu bridges (in 2 and 3) and/or centrosymmetric As4O4 ring systems (in 1-3) into chain (1) or layer structures (2 und 3).
    Notes: Die polymeren Komplexe [Cu4Cl4{cyclo-(C2H5AsO)4}3]n (1), [Cu3Br3{cyclo-(C2H5AsO)4}2]n (2) und [Cu6I6{cyclo-(C2H5AsO)4}3]n (3) wurden durch die Umsetzung von (C2H5AsO)n und CuX (X = Cl, Br, I) in Acetonitril dargestellt und durch Röntgenstrukturanalyse charakterisiert. Alle drei Komplexe enthalten lediglich Tetramere (C2H5AsO)4 als Liganden, wobei die As4O4-Ringsysteme zwischen zwei und vier Cu-Atomen koordinieren. Es wird jeweils ein As4O4-Ring mit Kronenkonformation beobachtet, der entweder vier (in 1) oder drei (in 2 und 3) Cu-Atome axial koordiniert. Außerdem liegen weitere (C2H5AsO)4-Liganden in boat-chair- (in 1) oder twist-chair-Konformation (in 1-3) vor. Die einzelnen Baueinheiten werden über Cu—X—Cu-Brücken (in 2 und 3) und/oder zentrosymmetrische As4O4-Ringsysteme (in 1-3) zu Ketten-(1) oder Schichtstrukturen (2 und 3) verknüpft.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200222
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  • 5
    Electronic Resource
    Electronic Resource
    Synthese sowie Kristall- und Molekülstruktur von Tetrafluoro[2-(pyrrolidinio)ethyl]silicatProfessor Ulrich Wannagat zum 70. Geburtstage gewidmet (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1012-1016 
    Details
    ISSN: 0044-2313
    Keywords: Zwitterionic λ5-organofluorosilicate ; pentacoordinate silicon ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal and Molecular Structure of Tetrafluoro[2-(pyrrolidinio)ethyl]silicateThe zwitterionic tetrafluoro[2-(pyrrolidinio)ethyl]silicate (4) was synthesized by reaction of trimethoxy(2-pyrrolidinoethyl)silane (5) with hydrogen fluoride in ethanol/hydrofluoric acid at 0°C. The crystal and molecular structure of 4 was studied at -100°C by single-crystal X-ray diffraction. In addition, 4 was characterized by solution-state NMR studies (CD3CN: 1H, 13C).
    Notes: Das zwitterionische Tetrafluoro[2-(pyrrolidinio)ethyl]silicat (4) wurde durch Reaktion von Trimethoxy(2-pyrrolidinoethyl)silan (5) mit Fluorwasserstoff in einem Ethanol/Flußsäure-Gemisch bei 0°C synthetisiert. Die Kristall- und Molekülstruktur von 4 wurde bei - 100°C mittels einer Einkristall-Röntgenstrukturanalyse untersucht. Außerdem wurde 4 durch NMR-Untersuchungen in Lösung charakterisiert (CD3CN: 1H, 13C).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190610
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  • 6
    Electronic Resource
    Electronic Resource
    Tetramethylcyclotetraarsoxane Bridged Copper(I) Halides with Porous Sheet and Framework Structures ∞2[CuX{cyclo-(MeAsO)4}] (X=Cl, Br, I) and ∞3[Cu3X3{cyclo-(MeAsO)4}2] (X=Cl, Br) (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1399-1406 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19976230914
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  • 7
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von RbSb3Se5 (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 557 (1988), S. 98-104 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of RbSb3Se5RbSb3Se5 was prepared by methanolothermal reaction of Rb2CO3 with Sb2Se3 at a temperature of 175°C. An X-ray structural analysis demonstrated that the compound contains polyselenoantimonate(III) anions (Sb3Se5-)n. A ψ-tetrahedral coordination is observed for one of the independent Sb atoms, a ψ-trigonal bipyramidal coordination for the other two. The Sb—Se polyhedra are linked through joint edges into sheets.
    Notes: RbSb3Se5 wurde durch methanolothermale Reaktion von Rb2CO3 mit Sb2Se3 bei einer Temperatur von 175°C dargestellt. Eine Röntgenstrukturanalyse ergab, daß die Verbindung Polyselenoantimonat(III)-Anionen (Sb3Se5-)n beinhaltet. Für eines der drei unabhängigen Sb-Atome wird eine ψ-tetraedrische Koordination, für die anderen eine ψ-trigonalbipyramidale Koordination gefunden. Die Sb—Se-Polyeder sind über gemeinsame Ecken zu Schichten vernetzt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885570110
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesen, Einkristall-Röntgenstrukturanalysen und 29Si-Festkörper-NMR-Untersuchungen eines zwitterionischen λ5-Spirosilicats und eines käfigartigen Octa(silasesquioxans)Professor Hartmut Bärnighausen zum 60. Geburtstage gewidmet (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 347-358 
    Details
    ISSN: 0044-2313
    Keywords: Zwitterionic λ5-spirosilicate ; cage-like octa(silasesquioxane) ; Si—C cleavage reactions ; crystal structures ; 29Si CP/MAS NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses, Single-Crystal X-Ray Analyses and Solid-State 29Si NMR Studies of a Zwitterionic λ5-Spirosilicate and a Cage-like Octa(silasesquioxane)The zwitterionic λ5-spirosilicate bis[2,3-naphthalenediolato(2 -)][2-(dimethylammonio)phenyl]silicate (1; isolated as 1 · 1/2 CH3CN) was synthesized by reaction of the [2-(dimethylamino)phenyl]dimethoxyorganosilanes 5, 6 and 7 [2-(Me2N)C6H4Si(OMe)2R: R = Ph (5), cyclo—C6H11 (6), Me (7)] with 2,3-dihydroxynaphthalene in acetonitrile at room temperature. Reaction of 1 · 1/2 CH3CN or [2-(dimethylamino)phenyl]trimethoxysilane (3) with water in acetonitrile yielded the cage-like octa{[2-(dimethylamino)phenyl]silasesquioxane} (2). The crystal structures of 1 · 1/2 CH3CN and 2 were studied by X-ray diffraction. In addition, 1 · 1/2 CH3CN and 2 were characterized by solid-state (29Si CP/MAS) and solution NMR studies (1H, 13C, 29Si).
    Notes: Das zwitterionische λ5-Spirosilicat Bis[2,3-naphthalindiolato(2 -)][2-(dimethylammonio)- phenyl]silicat (1; isoliert als 1 · 1/2 CH3CN) wurde durch Reaktion der [2-(Dimethylamino)phenyl]dimethoxyorganylsilane 5, 6 bzw. 7 [2-(Me2N)C6H4Si(OMe)2R: R = Ph (5), cyclo-C6H11 (6), Me (7)] mit 2,3-Dihydroxynaphthalin in Acetonitril bei Raumtemperatur synthetisiert. Durch Reaktion von 1 · 1/2 CH3CN bzw. [2-(Dimethylamino)phenyl]trimethoxysilan (3) mit Wasser in Acetonitril wurde das käfigartige Octa{[2-(dimethylamino)phenyl]silasesquioxan} (2) erhalten. Die Kristallstrukturen von 1 · 1/2 CH3CN und 2 wurden mittels Röntgenbeugung untersucht. Außerdem wurden 1 · 1/2 CH3CN und 2 durch Festkörper-NMR-Untersuchungen (29Si-CP/MAS) und NMR-Untersuchungen an Lösungen charakterisiert (1H, 13C, 29Si).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190220
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  • 9
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Rb2Sn3S7 · 2H2O und Rb4Sn2Se6 (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1041-1045 
    Details
    ISSN: 0044-2313
    Keywords: Rubidium chalcogenidostannates(IV) ; solvatothermal synthesis ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Rb2Sn3S7 · 2 H2O and Rb4Sn2Se6Rb2Sn3S7 · 2 H2O has been prepared by hydrothermal reaction of SnS2 and Rb2CO3 in an with H2S saturated aqueous solution at 190°C. The crystal lattice contains chain anions ∞1[Sn3S72-] which display both SnS4 tetrahedra and SnS6 octahedra. Methanolothermal reaction of SnCl2 with Se and Rb2CO3 at 145°C leads to the formation of Rb4Sn2Se6 which contains edge-bridged bitetrahedral [Sn2Se6]4- anions.
    Notes: Rb2Sn3S7 · 2 H2O wurde durch hydrothermale Reaktion von SnS2 und Rb2CO3 in einer mit H2S gesättigten wäßrigen Lösung bei 190°C synthetisiert. Das Kristallgitter enthält Kettenanionen ∞1[Sn3S72-], die sowohl SnS4-Tetraeder als auch SnS6-Oktaeder aufweisen. Methanolothermale Reaktion von SnCl2 mit Se und Rb2CO3 bei 145°C führt zur Bildung der Phase Rb4Sn2Se6, die isolierte kantenverknüpfte bitetraedrische Anionen [Sn2Se6]4- enthält.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200616
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Darstellung und Kristallstruktur von Rb2Sb4S7 (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 557 (1988), S. 105-111 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Preparation and Crystal Structure of Rb2Sb4S7Rb2Sb4S7 was prepared by methanolothermal reaction of Rb2CO3 with Sb2S3 at a temperature of 140°C. An X-ray structural analysis demonstrated that the compound contains polythioantimonate(III) anions (Sb4S72-)n, for which the basic element is a ψ-trigonal (SbS4)-bipyramid. Edge bridged SbS4 polyhedra build vierer single chains (Sb4S84-)n, which are linked via two symmetry related S atoms with neighbouring chains so that an (Sb4S72-)n sheet is formed.
    Notes: Rb2Sb4S7 wurde durch methanolothermale Reaktion von Rb2CO3 mit Sb2S3 bei einer Temperatur von 140°C dargestellt. Eine Röntgenstrukturanalyse ergab, daß die Verbindung Polythioantimonat(III)-Anionen (Sb4S72-)n enthält, in denen die Grundelemente ψ-trigonale SbS4-Bipyramiden sind. Kantenverbrückte SbS4-Polyeder bilden Vierer-Einfachketten (Sb4S84-)n, die dergestalt über zwei symmetrieverwandte S-Atome mit benachbarten Ketten verknüpft sind, daß eine (Sb4S72-)n-Schicht entsteht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885570111
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