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  • 1
    ISSN: 0044-2313
    Keywords: Phosphoraneimine Complexes of Iodine Chlorides, Syntheses, IR Spectra, Crystal Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Silylated Phosphorane Imines with Iodine Monochloride and Iodine Trichloride. The Crystal Structures of [Me3SiNPMe3 · ICl], [Ph3PNCl · ICl], and [Me3PN(H)PMe3][ICl2]2The donor-acceptor complex [Me3SiNPMe3 · ICl] has been prepared from Me3SiNPMe3 and ICl in acetonitrile solution forming yellow-orange crystals. [Ph3PNCl · ICl] can be prepared by the reaction of Me3SiNPPh3 with ICl3 in dichloromethane solution forming pale yellow crystals. [Me3PN(H)PMe3][ICl2]2 is formed in a small amount by a slow reaction of Me3SiNPMe3 with ICl3 in CCl4 suspension in the presence of traces of moisture. All samples are characterized by IR spectroscopy and by X-ray structure analyses.[Me3SiNPMe3 · ICl] (1): Space group Iba2, Z = 8, structure solution with 1 727 observed unique reflections, R = 0.051. Lattice dimensions at -60°C: a = 1 510.7, b = 1 862.8, c = 988.9 pm. 1 has a molecular structure in which the N atom of the phosphorane imine is connected with the iodine atom of the ICl molecule in a linear arrangement N—I—Cl. Bond lengths N—I = 222.7 pm, I—Cl = 265.1 pm.[Ph3PNCl · ICl] (2): Space group Pna21, Z = 4, structure solution with 1 530 observed unique reflections, R = 0.030. Lattice dimensions at 20°C: a = 1 522.8, b = 1 408.3, c = 865.8 pm. 2 has a molecular structure in which the N atom of the N chlorophosphorane imine is connected with the iodine atom of the ICl molecule in a linear arrangement. Bond lengths N—Cl = 174.4 pm, N—I = 229.5 pm, I—Cl = 251.2 pm.[Me3PN(H)PMe3][ICl2]2 (3): Space group P21/c, Z = 4, structure solution with 1 989 observed unique reflections, R = 0.029. Lattice dimensions at -50°C: a = 1 223.1, b = 1 090.2, c = 1 482.8 pm, β = 112.21°. 3 consists of [Me3PN(H)PMe3]2+ ions and ICl2- anions. The PNP bond angle of the dication amounts to 134.4° with PN distances of 165.6 and 166.1 pm, approximately according to double bonds.
    Notes: Der Donor-Akzeptorkomplex [Me3SiNPMe3 · ICl] entsteht aus Me3SiNPMe3 und ICl in Acetonitrillösung als gelborange Kristalle. [Ph3PNCl ·ICl] wird durch Umsetzung von Me3SiNPPh3 mit ICl3 in Dichlormethanlösung als hellgelbe Kristalle erhalten. [Me3PN(H)PMe3][ICl2]2 bildet sich in geringer Menge aus Me3SiNPMe3 und ICl3 in Tetrachlorkohlenstoff nach Zutritt von Feuchtigkeit. Alle Präparate werden durch die IR-Spektren und durch Kristallstrukturanalysen charakterisiert.[Me3SiNPMe3 · ICl] (1): Raumgruppe Iba2, Z = 8, Strukturlösung mit 1 727 beobachteten unabhängigen Reflexen, R = 0,051. Gitterkonstanten bei -60°C: a = 1 510,7; b = 1 862,8; c = 988,9 pm. 1 hat eine Molekülstruktur, in der das N-Atom des Phosphanimins mit dem Iodatom des ICl-Moleküls in linearer Anordnung N—I—Cl verknüpft ist. Bindungslängen N—I = 222,7 pm, I—Cl = 265,1 pm.[Ph3PNCl · ICl] (2): Raumgruppe Pna21, Z = 4, Strukturlösung mit 1 530 beobachteten, unabhängigen Reflexen, R = 0,030. Gitterkonstanten bei 20°C: a = 1 522,8; b = 1 408,3; c = 865,8 pm. 2 hat eine Molekülstruktur, in der das N-Atom des N-Chlorphosphanimins mit dem Iodatom des ICl-Moleküls in linearer Anordnung verknüpft ist. Bindungslängen N—Cl = 174,4 pm, N—I = 229,5 pm, I—Cl = 251,2 pm.[Me3PN(H)PMe3][ICl2]2 (3): Raumgruppe P21/c, Z = 4, Strukturlösung mit 1 989 beobachteten unabhängigen Reflexen, R = 0,029. Gitterkonstanten bei -50°C: a = 1 223,1; b = 1 090,2; c = 1 482,8 pm, β = 112,21°. 3 besteht aus [Me3PN(H)PMe3]2+-Ionen und ICl2--Anionen. Der PNP-Bindungswinkel des Dikations beträgt 134,4° bei PN-Abständen von 165,6 und 166,1 pm, die etwa Doppelbindungen entsprechen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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