SYNTHETIC PATHWAYS FOR (MU-HO)ZN2 COMPLEXES

被引:28
作者
ALSFASSER, R [1 ]
VAHRENKAMP, H [1 ]
机构
[1] UNIV FREIBURG,INST ANORGAN & ANALYT CHEM,ALBERTSTR 21,W-7800 FREIBURG,GERMANY
来源
CHEMISCHE BERICHTE-RECUEIL | 1993年 / 126卷 / 03期
关键词
ZINC COMPLEXES; DINUCLEAR; HYDROXIDE BRIDGES; PYRAZOLE LIGANDS; IMIDAZOLE LIGANDS;
D O I
10.1002/cber.19931260321
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The reactions of the 3-substituted kalium hydrotris(pyrazolyl)borates 1 c, d (R = tert-butyl, anisyl) with Zn(ClO4)2 . 6 H2O produce the dinuclear mu-hydroxo complexes [L3Zn-O(H)-ZnL3](ClO4)3 (2a, b; L = 5-tert-butylpyrazole, 5-anisylpyrazole), due to hydrolytic cleavage of the B N bonds. These and similar complexes (2c, d; L = 5-tert-butyl-3-methylpyrazole, 5-phenylpyrazole) are also accessible directly from Zn(ClO4)2. 6 H2O, the substituted pyrazole, and KOH, and in one case (2 b; L = 5-anisylpyrazole) by hydrolytic cleavage of [HB(3-anisylpyrdzoly)3ZnEt] with perchloric acid. With other pyrazole and imidazole ligands, the Zn(ClO4)2/L/KOH reaction produces the simple complexes [ZnL6](ClO4)2 (3a, b; L = pyrazole, 3-methyl-5-phenylpyrazole) and [ZnL4](ClO4)2 (4; L = 2-methylimidazole). The crystal structures of 2a and 4, each containing tetrahedrally coordinated zinc atoms, have been determined.
引用
收藏
页码:695 / 701
页数:7
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