Synthesis and coordination chemistry of ortho-perfluoroalkyl-derivatised triarylphosphines

被引:37
作者
Croxtall, B [1 ]
Fawcett, J [1 ]
Hope, EG [1 ]
Stuart, AM [1 ]
机构
[1] Univ Leicester, Dept Chem, Leicester LE1 7RH, Leics, England
来源
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 2002年 / 04期
关键词
D O I
10.1039/b107390g
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
In order to establish the steric and electronic effects of fluorous ponytails in the ortho-positions of triarylphosphines the two novel phosphines, PPh2(2-C6H4C6F13) II and P(4-C6H4C6F13)(2)(2-C6H4C6F13) V, have been synthesised and their coordination chemistry investigated and compared with that of the ortho-trifluoromethyl-derivatised ligand, PPh2(2-C6H4CF3) VI. The single crystal X-ray structures of Ph2P(O)(2-C6H4C6F13) and Ph2P(O)(2-C6H4CF3), along with that of PPh2(2-C6H4CF3), are reported and compared with each other. The large steric influence of the ortho-tri fluoromethyl and -perfluorohexyl substituents results in the formation of the, normally, less-thermodynamically favoured trans-[PtCl2L2] complexes. Analysis of the single crystal X-ray structures of trans-[PtCl2{PPh2(2-C6H4CF3)}(2)] 1, trans-[PtCl2{PPh2(2-C6H4C6F13)}(2)] 2 and trans-[RhCl(CO){PPh2(2-C6H4CF3)}(2)] 4 reveals a larger cone angle for PPh2(2-C6H4CF3) (169degrees) than for PPh2(2-C6H4C6F13). An average cone angle of 166degrees was calculated for the latter phosphine with values ranging from 164 to 168degrees.
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收藏
页码:491 / 499
页数:9
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