Platinum complexes with diamino-substituted phosphorus ligands: Synthesis, characterization, and their reactivity with a Lewis acid - 14/09/10
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Abstract |
Reaction of dialkyl- or diaryl-platinum complexes PtR2(cod) (cod=η2, η2-1,5-cyclooctadiene, R=Me, p-tol) with diamino-substituted phosphorus ligands P(NMeCH2)2(R′) (R′=OMe, NEt2) produced neutral complexes, cis-[Pt(R)2{P(NMeCH2)2(R′)}2]. On the other hand, reaction of dihalogeno platinum complex PtX2(cod) (X=Cl, I) with P(NMeCH2)2(OMe) yielded a cationic complex [PtX{P(NMeCH2)2(OMe)}3]X. A platinum complex having both methyl and halogeno ligands, PtMeX(cod), reacted with P(NMeCH2)2(OMe) to give a cationic methyl complex [PtMe{P(NMeCH2)2(OMe)}3]X, by contrast, it reacted with P(NMeCH2)2(NEt2) to yield a neutral methyl complex [PtMeX{P(NMeCH2)2(NEt2)}2]. Reaction of [PtMe{P(NMeCH2)2(OMe)}3]X with BF3·OEt2 and then NaBPh4 afforded [PtX{P(NMeCH2)2(OMe)}3]BPh4, showing preferential Me group abstraction on the Pt center rather than the OMe abstraction on the phosphorus atom, followed by the coordination of X to the Pt center. All new complexes were fully characterized using 1H, 13C{1H}, and 31P{1H} NMR measurements and elemental analyses. In addition, structures of several complexes were determined by single crystal X-ray diffraction studies.
El texto completo de este artículo está disponible en PDF.Keywords : Platinum, Phosphorus heterocycles, Lewis acid, X-ray diffraction
Esquema
Vol 13 - N° 8-9
P. 943-953 - août 2010 Regresar al número
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