Platinum(II) complexes with polydentate N-heterocyclic carbenes: synthesis, structural characterization and hydrosilylation catalysis.
The platinum(II) complexes of multidentate N-heterocyclic carbenes, [Pt(L1)(2)Cl](PF(6)) (1, L1 = N-methyl-N-(2-pyrimidinyl)imidazolylidene), [Pt(L2)Cl](PF(6)) (2, L2 = N-butyl-N-(1,10-phenanthrolin-2-yl)imidazolylidene), [PtL3](PF(6))(2) (3, L3 = bis(N-picolylimidazolylidenyl)methane), [PtL4](PF(6))(2) (4, L4 = (bis(N-2-pyrimidylimidazolylidenyl)methane) (4) and [Pt(L5)(2)](PF(6))(2) [5, L5 = bis(N-pyridylimidazoliumyl)methane] have been synthesized and structurally characterized. All these complexes exhibit slightly distorted square-planar configuration. These complexes are efficient catalyst precursors for hydrosilylation of alkynes. Complexes 2 and 4 are much more active than complexes 1, 3 and 5. In the hydrosilylation of arylacetylenes, relatively long induction periods were observed for 1, 3 and 5.
Lu
Chunxin
C
Department of Chemistry, Zhejiang University, Xixi Campus, Hangzhou, 310028, People's Republic of China.
Gu
Shaojin
S
Chen
Wanzhi
W
Qiu
Huayu
H