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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 468 (1980), S. 55-67 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Acyl-and Alkylidenephosphines. XI. Synthesis, Molecular and Crystal Structure of 1,2-Bis(2′,2′-dimethylpropionyl)-1, 2-diphenyldiphosphine2,2-Dimethylpropionyl-phenylphosphine and bis[bis(trimethylsily)amino]mercury react to form mercury and 1, 2-bis(2′, 2′-dimethylpropionyl)-1, 2-diphenyldiphosphine 1 a. The compound crystallizes orthorhombic in the non-centrosymmetric space group Pca21 with a = 22.13(1); b = 17.59(2); c = 11.14(2) Å; Z = 8. As found by an X-ray structure determination (R = 4%) at -145°C the S,S and R,R enantiomeres showing a transoid arrangement of the substituents at the phosphorus atoms are present in the solid state. The asymmetric part of the until cell contains tow molecules with different conformation. Compared with the standard value the bond between the phosphorus and the carbon atom of the carbonyl group is elongated (1. 89 Å). Further averaged data are: P—P 2.21; C—O 1.21; P—C(phenyl) 1.84 Å; ∡ P—P—C(O) 97°; P—P—C(phenyl) 96°.
    Notes: 2,2-Dimethylpropionyl-phenylphosphan und Bis[bis(trimethylisilyl)-amino]quecksilber reagieren unter Quecksilberabscheidung zum 1,2-Bis(2′,2′-dimethylpropionyl)-1, 2-diphenyldiphosphan 1a. Die Verbindung kristallisiert orthorhombisch in der nichtzentrosymmetrischen Raumgruppe Pca21 mit a = 22,13(1); b = 17,59(2); c = 11,14(2) Å; Z = 8. Wie eine Röntgenstrukturanalyse (R = 4,0%) bei -145°C zeigt, liegen die Enantiomeren R,R und S,S mit einer transoiden Anordnung der Substituenten an den Phosphoratomen vor. Die asymmetrische Einheit der Elementarzelle enthält zwei Moleküle unterschiedlicher Konformation. Der Abstand zwischen Phosphor- und Carbonylkohlenstoffatom ist mit 1,89 Å gegenüber dem Standardwert verlängert. Charakteristische mittlere Bindungsabstände und -winkel sind: P—P 2,21; C—O 1, 21; P—C(Phenyl) 1, 84 Å; ∡ P—P—C(O) 97°; P—P—C(Phenyl) 96°.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Trimethylsilyl Derivatives of Vb Elements. VII. Crystal Structures of Lithium Bis(trimethylsilyl)bismuthide · DME and of Tetrakis(trimethylsilyl)dibismuthane as well as Some Comments on the Crystal Structure of Bis(4-methoxyphenyl)ditellaneColourless lithium bis(trimethylsilyl)bismuthide · DME1,2-Dimethoxyethan (DME); Tetrahydrofuran (THF) 1 and green, metallic lustrous tetrakis(trimethylsilyl)dibismuthane 2 crystallize isotopic to their antimony homologues [1, 2]. As it is shown by crystal structure determinations { 1 : -90°C; I 4 2d; a = 1017,3(4); c = 3738,0(26) pm; Z = 8; R w= 0,065; 2 : + 20°C; P2 1/c; a = 680,9(4); b = 1704,8(13); c = 1197,9 (10) pm; β = 119,46(6)°; Z = 2; R w= 0,084} both compounds form chains which in the case of bismuthide 1 are built up as screws of alternating bismuth and lithium atoms; bonding further to two trimethylsilyl groups or to the chelating DME ligand both atoms gain coordination number 4 {Li—Bi 292(3); Bi—Si 263.3(14) pm; Bi—Li—Bi 132(1); Li—Bi—Li 148(1); ϕ(Li—Bi—Li—Bi) 83°}. In the case of dibismuthane 2 the centrosymmetric molecules are strung, their Bi-Bi groups forming nearly linear zigzag chains with shortened intermolecular contact distances {Bi-Bi 303.5(3); Bi … Bi 380.4(3); Bi—Si 268 pm; Bi—Bi … Bi 169; Bi—Bi—Si 97.4(5) and 92.0(5)°}. Structure and properties of 2 are compared with those of similar compounds; the crystal structure of brown, green metallic lustrous bis(4-methoxyphenyl)ditellane 5 already published by Ludlow and McCarthy[3] is reinvestigated with respect to very short intermolecular Te…Te contacts.
    Notes: Das farblose Lithium-bis(trimethylsilyl)bismutid · DME 1 und das grüne, metallähnlich glänzende Tetrakis(trimethylsilyl)dibismutan 2 kristallisieren isotyp zu ihren jeweiligen Antimon-Homologen [1, 2]. Nach Röntgenstrukturanalysen {1: -90°C; I42d; a = 1017,3(4); c = 3738,0(26) pm; Z = 8; Rw = 0,065; 2: + 20°C; P21/c; a = 680,9(4); b = 1704,8(13); c = 1197,9 (10) pm; β = 119,46(6)°; Z = 2; Rw = 0,084} bilden beide Verbindungen im Festkörper Ketten. Beim Bismutid 1 bauen sie sich schraubenartig aus Bismut- und Lithiumatomen in alternierender Abfolge auf; durch Bindung zu zwei Trimethylsilyl-Substituenten bzw. zum Chelatliganden DME wird jeweils die Koordinationszahl 4 erreicht {Li—Bi 292(3); Bi—Si 263,3(14) pm; Bi—Li—Bi 132(1); Li—Bi—Li 148(1); ϕ(Li—Bi—Li—Bi) 83°}. Beim Dibismutan 2 reihen sich die Bi—Bi-Hanteln zu fast linearen, homonuklearen Zickzack-Ketten mit verkürztem intermolekularem Kontakt auf; das Molekül besitzt die zentrosymmetrische Konformation {Bi—Bi 303,5(3); Bi…Bi 380,4(3); Bi—Si 268 pm; Bi—Bi…Bi 169; — Bi—Bi—Si 97,4(5) und 92,0(5)°}. Struktur und Eigenschaften von 2 werden mit denen ähnlicher Verbindungen verglichen; die bereits von Ludlow u. McCarthy [3] publizierte Kristallstruktur des braunen, grün metallisch glänzenden Bis(4-methoxyphenyl)ditellans 5 wird im Hinblick auf sehr kurze intermolekulare Te … Te-Kontakte untersucht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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