Phosphine oxide functionalised with two bipyridine subunits:: a novel ligand for the engineering of sterically hindered complexes

被引:10
作者
Douce, L
Charbonnière, L
Cesario, M
Ziessel, R
机构
[1] ECPM, Lab Chim Elect & Photon Mol, CNRS, UPRESA 7008, F-67087 Strasbourg, France
[2] CNRS, Inst Chim Subst Nat, F-91128 Gif Sur Yvette, France
关键词
D O I
10.1039/b102520c
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Ligand L, containing two 6-methyl-6'-methyl-yl-2,2'-bipyridine moieties linked by a "PhP=O'' spacer, has been prepared. Subsequent complexation with [Cu(CH3CN)(4)](BF4) led to a unique complex of formula [CuL](BF4). The molecular structure has been determined by X-ray crystallography in the solid state and NMR studies in solution. The complex displays an intense absorption band in the visible wavelength range with maxima at 418 and 509 nm, and is oxidised reversibly at +0.66 V (DeltaE(p) = 80 mV) to the corresponding Cu(II) species, while two successive reductions of the coordinated bipyridine fragments occur at -1.60 (DeltaE(p) = 66) and -1.84 V (DeltaE(p) = 70 mV) vs. SCE. Direct spectrophotometric titrations with global analysis allowed us to elicit stability constants for the emergent complex and to highlight the formation of a dinuclear complex in the presence of excess copper.
引用
收藏
页码:1024 / 1030
页数:7
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