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  • 1
    ISSN: 0044-2313
    Keywords: Phosphorane Iminato Complexes ; Copper(II) ; Synthesis ; Magnetic Behaviour ; EPR Spectrum ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: [Cu4(NPMe3)3(O2C—CH3)5] - a Tetrameric Phosphorane Iminato Complex of Copper(II). Synthesis, Crystal Structure, Magnetic Behaviour, and EPR SpectrumThe title compound and the corresponding benzoate complex [Cu4(NPMe3)3(O2C—C6H5)5] have been prepared by reactions of copper(II)acetate and copper(II)benzoate, respectively, with Me3SiNPMe3 in dichloromethane. Both complexes are characterized by IR spectroscopy. The acetate complex is additionally characterized by the measurement of the magnetic susceptibility, by its EPR spectrum, and by a crystal structure determination.[Cu4(NPMe3)3(O2C—CH3)5] · CH2Cl2: Space group I41/a, Z = 16, structure solution with 7 960 independent reflections, R = 0.044. Lattice dimensions at -70°C: a = b = 3 670.6; c = 1 091.9 pm. The structure consists of four Cu atoms which are arranged at the corners of a distorted tetrahedron with Cu…Cu distances between 290 and 318 pm. Three of the faces of the tetrahedron are linked by μ3-N atoms of the phosphorane iminato groups. Three of the acetate ligands form chelates, the other two are monofunctionally coordinated. Three of the copper atoms have a planar surrounding, the forth Cu atom has a (4 + 1) coordination.
    Notes: Die Titelverbindung sowie der entsprechende Benzoat-Komplex [Cu4(NPMe3)3(O2C—C6H5)5] wurden durch Reaktion von Kupfer(II)acetat bzw. von Kupfer(II)benzoat mit Me3SiNPMe3 in Dichlormethan hergestellt und durch ihre IR-Spektren charakterisiert. Der Acetatkomplex wurde zusätzlich durch die Messung der magnetischen Suszeptibilität, des EPR-Spektrums und durch eine Kristallstrukturanalyse charakterisiert.[Cu4(NPMe3)3(O2C—CH3)5] · CH2Cl2: Raumgruppe I41/a, Z = 16, Strukturlösung mit 7 960 unabhängigen Reflexen, R = 0,044. Gitterkonstanten bei -70°C: a = b = 3 670,6; c = 1 091,9 pm. Die Struktur besteht aus vier Cu-Atomen, die ein verzerrtes Tetraeder bilden mit Cu…Cu-Abständen zwischen 290 und 318 pm. Drei der Tetraederflächen sind durch μ3-N-Atome dreier NPMe3--Gruppen überbrückt, drei der Acetatliganden sind chelatartig gebunden, während zwei Acetatgruppen monofunktionell koordinieren. Drei der Cu-Atome haben planare Umgebung, das vierte hat eine (4 + 1)-Koordination.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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