Bis(diphenylphosphido) derivatives of the heavier group 2 elements

被引:37
作者
Crimmin, Mark R.
Barrett, Anthony G. M.
Hill, Michael S.
Hitchcock, Peter B.
Procopiou, Panayiotis A.
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England
[2] Univ Sussex, Chem Lab, Brighton BN1 9QJ, E Sussex, England
[3] GlaxoSmithKline Med Res Ctr, Stevenage SG1 2NY, Herts, England
关键词
D O I
10.1021/ic701608x
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
A number of heavier alkaline-earth (Ae) diphenylphosphides have been prepared by protonolysis of the corresponding bis(trimethylsilyl)amides and completely characterized in the solid state and in solution. Through careful control of the reaction and workup conditions, preparations performed with tetrahydrofuran (THF) as the only donor solvent crystallize as octahedral tetrakis-solvated THF adducts [Ae(PPh2)(2)(THF)(4)] when Ae = Ca and Sr. Both structures are similar and contain the two diphenylphosphicle substituents in a trans disposition. In contrast, the analogous reaction performed upon the barium amide yielded a one-dimensional polymeric complex containing both five- and six-coordinated Ba centers in which the polymer is propagated via bridging diphenylphosphide units. Further strictly mononuclear derivatives of the Ca and Ba diphenylphosphides may be straightforwardly prepared by treatment of the THF adducts with 18-crown-6. Although the THF-solvated species are evidently labile to loss of solute, solution (diffusion-ordered spectroscopy NMR, THF-d(8)) studies indicate that, under catalytically relevant conditions, a similar mononuclear constitution is most likely retained.
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页码:10410 / 10415
页数:6
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