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  • 1
    ISSN: 0044-2313
    Keywords: Amidinato complexes of thallium(III) ; syntheses ; i.r. spectra ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Trimethylsilyl Substituted Amidinato Complexes of Thallium(III). The Crystal Structure of [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3]The amidinato complexes [Ph—C(NSiMe3)2TlCl3] and [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3] have been prepared by the reaction of TlCl3 with N,N,N′-tris(trimethylsilyl)benzamidine in THF solution. They were characterized by IR spectroscopy, [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3] additionally by an X-ray structure determination. Space group P21/c, Z = 4, 4300 observed unique reflexions, R = 0.053. Lattice dimensions at -43°C: a = 1157.2, b = 2346.3, c = 1536.9 pm, β = 105.98°. The structure consists of amidinium cations, and of anions [Ph—C(NSiMe3)2TlCl3]-, in which the thallium atom is fivefold surrounded by three chlorine atoms and by two nitrogen atoms of the amidinato chelate.
    Notes: Die Amidinatokomplexe [Ph—C(NHSiMe3)2TlCl2] und [Ph—C(NHSiMe3)2TlCl2] [Ph—C(NSiMe3)2TlCl3] entstehen bei der Einwirkung von Thallium(III)-chlorid auf N,N,N′-Tris(trimethylsilyl)benzamidin in Tetrahydrofuranlösung. Sie werden durch ihre IR-Spektren, und [Ph—C(NHSiMe3)2] [Ph—C(NSiMe3)2TlCl3] zusätzlich durch eine Kristallstrukturanalyse charakterisiert. Raumgruppe P21/c, Z = 4, 4300 unabhängige beobachtete Reflexe, R = 5,3%. Die Gitterkonstanten betragen bei -43°C: a = 1157,2; b = 2346,3; c = 1536,9 pm; β = 105,98°. Die Verbindung besteht aus einem Amidiniumkation und einem [Ph—C(NSiMe3)2TlCl3]--Anion, in dem das Thalliumatom verzerrt trigonal-bipyramidal von drei Cl-Atomen und chelatartig von den beiden N-Atomen des Amidinatoliganden umgeben ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Phosphorane Iminato Complexes of Selenium ; Chloroselenates(II) ; Syntheses ; Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorane Iminato-Trichloroselenates(II): Syntheses and Crystal Structures of [SeCl(NPPh3)2]+SeCl3- and [Me3SiN(H)PMe3]2+[Se2Cl6]2-[SeCl(NPPh3)2]+SeCl3- has been synthesized by the reaction of Se2Cl2 with Me3SiNPPh3 in acetonitrile solution, forming orangered crystals, whereas red crystals of [Me3SiN(H)PMe3]2+[Se2Cl6]2- were obtained by the reaction of Me3SiNPMe3 with SeOCl2 in acetonitrile solution. Both complexes were characterized by X-ray structure determinations.[SeCl(NPPh3)2]+SeCl3-: Space group P21/n, Z = 4, structure solution with 7 489 observed unique reflections, R = 0.057. Lattice dimensions at -60°C: a = 1 117.0; b = 2 241, c = 1 407.5 pm, β = 95.61°. In the cation [SeCl(NPPh3)2]+ the selenium atom is ϕ-tetrahedrally coordinated by the chlorine atom and by the nitrogen atoms of the phosphorane iminato ligands, whereas the anion SeCl3- has a T-shaped structure with ϕ-trigonal-bipyramidale surrounding of the selenium atom.[Me3SiN(H)PMe3]2+[Se2Cl6]2-: Space group P21/c, Z = 4, structure solution with 2 093 observed unique reflections, R = 0.080. Lattice dimensions at -70°C: a = 956, b = 828, c = 1 973 pm, β = 93.80°. The structure consists of [Me3SiN(H)PMe3]+ ions and planar [Se2Cl6]2- anions, in which the selenium atoms are bridged nearly symmetrically by two chlorine atoms.
    Notes: [SeCl(NPPh3)2]+SeCl3- entsteht in Form orangeroter Kristalle bei der Reaktion von Se2Cl2 mit Me3SiNPPh3 in Acetonitrillösung, während [Me3SiN(H)PMe3]2+[Se2Cl6]2- als rote Kristalle durch Einwirkung von Me3SiNPMe3 auf SeOCl2 in Acetonitrillösung gebildet wird. Beide Verbindungen wurden kristallographisch charakterisiert.[SeCl(NPPh3)2]+SeCl3-: Raumgruppe P21/n, Z = 4, Strukturlösung mit 7 489 beobachteten unabhängigen Reflexen, R = 0,057. Gitterabmessungen bei -60°C: a = 1 117,0; b = 2 241; c = 1 407,5 pm, β = 95,61°. In dem Kation [SeCl(NPPh3)2]+ ist das Selenatom ϕ-tetraedrisch von dem Chloratom und von den N-Atomen der beiden Phosphaniminatoliganden umgeben, während das Anion SeCl3- T-förmige Gestalt hat mit ϕ-trigonal-bipyramidaler Umgebung des Selenatoms.[Me3SiN(H)PMe3]2+[Se2Cl6]2-: Raumgruppe P21/c, Z = 4, Strukturlösung mit 2 093 beobachteten unabhängigen Reflexen, R = 0,080. Gitterabmessungen bei -70°C: a = 956; b = 828; c = 1 973 pm, β = 93,80°. Die Struktur besteht aus [Me3SiN(H)PMe3]+-Ionen und planaren Anionen [Se2Cl6]2-, in denen die Selenatome über nahezu symmetrische Chlorobrücken zentrosymmetrisch verknüpft sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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