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  • 1
    ISSN: 0044-2313
    Keywords: Ether-phosphanes ; palladium complexes ; polysiloxane matrices ; crystal structure ; CP MAS NMR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Supported Organometallic Complexes. IV. Structural Investigations on Neutral and Cationic (Ether-phosphane)palladium(II) Complexes.Reaction of the (ether-phosphane) ligands PhP(R)CH2 - D (2a-c) [D=CH2OCH3: R=Ph (a), (CH2)3Si(OCH3)3 (b), (CH2)3SiO3/2 (b′); D= R=(CH2)3Si(OCH3)3 (c), (CH2)3SiO3/2 (c′)] with Cl2Pd(COD) (1) results in the formation of Cl2Pd(P  -  O)2 (3a-c). Cleavage of Cl- from 3 with AgSbF6 yields the cationic, monochelated complexes [ClPd(P  -  O)(P ∩ O)]+ (4 a - c) (P  -  O: η1-P-coordinated; P ∩ O: η2-O ∩ P-coordinated). 4 a crystallizes in the monoclinic space group P21/c with the lattice constants a=1 062,4(2), b=1 912,2(4) und c=1 635,5(3) pm, β=101,22(3)° and Z=4 (R=0,0341; Rw=0,033). With water 3 b, c and 4 b, c are subjected to polycondensation to give the supported complexes 3 b′, c′, 4 b′, c′. The structure 3 b′, c′, 4 b′, c′ is investigated by comparison of their 31P CP MAS data with the 31P{1H} NMR spectra of their soluble precursors 3 b, c, 4 b, c. 13C CP MAS NMR spectra of 3 b′, c′ and 4 b′, c′ indicate η1-P- and η2-O ∩ P-coordination of the ligands. The polysiloxane network of 4 b′ was inspected by contact time variation of the 29Si CP MAS NMR spectra and it appeared that 77% of the Si - O units are crosslinked, corresponding to a ratio T4:T3:T1=67:100:10.
    Notes: Die Reaktion der (Ether-Phosphan)-Liganden PhP(R)CH2 - D (2a - c) [D=CH2OCH3: R=Ph (a), (CH2)3Si(OCH3)3 (b), (CH2)3SiO3/2 (b′); D= R=(CH2)3Si(OCH3)3 (c), (CH2)3SiO3/2 (c′)] mit Cl2Pd(COD) (1) liefert die Komplexe Cl2Pd(P ∼ O)2 (3a - c). Durch Chloridabspaltung aus 3 a - c entstehen die kationischen Monochelaktomplexe [ClPd(P ∩O)(P ∼ O )]+ (4 a - c) (P ∼ O: η1-P-koordiniert; P ∩ O: η2-O ∩ P-koordiniert). 4a kristallisiert in der monoklinen Raumgruppe P21/c mit den Gitterkonstanten a=1 062,4(2), b=1 912,2(4) und c=1 635,5(3) pm, β=101,22(3)° und Z=4 (R=0,0341; Rw=0,033). 3 b, c und 4 b, c polykondensieren mit Wasser zu den trägerfixierten Komplexen 3 b′, c′, 4b′, c′. Die Bestimmung der Strukturen von 3 b′, c′, 4 b′, c′ erfolgt durch Vergleich der 31P-CP-MAS-NMR- mit den 31P{1H}-NMR-Spektren der löslichen Komplexe 3 b, c, 4 b, c. Aus den 13C-CP-MAS-NMR-Spektren von 4 b′, c′ ergibt sich die η1-P- und η2-O ∩ P-Koordination der Liganden. Eine Kontaktzeitvariation der 29Si-CP-MAS-NMR-Spektren von 4 b′ zeigt, daß die Matrix zu 77% vernetzt ist (T4:T3:T1=67:100:10).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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