Facile pyrazolylborate ligand degradation at lanthanide centers: X-ray crystal structures of pyrazolylborinate-bridged bimetallics

被引：33
作者：
Domingos, A
Elsegood, MRJ
Hillier, AC
Lin, GY
Liu, SY
Lopes, I
Marques, N
Maunder, GH
McDonald, R
Sella, A
Steed, JW
Takats, J
机构：
[1] UCL, Christopher Ingold Labs, Dept Chem, London WC1H 0AJ, England
[2] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada
[3] ITN, Dept Quim, P-2686953 Sacavem, Portugal
[4] Loughborough Univ Technol, Dept Chem, Loughborough LE11 3TU, Leics, England
[5] Kings Coll London, Dept Chem, London WC2R 2LS, England
来源：
INORGANIC CHEMISTRY | 2002年 / 41卷 / 25期
关键词：
D O I：
10.1021/ic025801c
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Adventitious hydrolysis of a number of different complexes with the molecular formula Ln(Tp(Me2))(2)X [Tp(Me2) = (HB-(dmpz)(3)), where X is a basic anionic ligand] in various solvents, yielded crystals of highly insoluble dimers of the general formula [Ln(Tp(Me2))(mu-BOp(Me2))](2) (1) [Ln = La, Ce, Sm; BOp(Me2) = (HBO(dmpz)(2))(2-); dmpzH = 3,5-dimethylpyrazole]. The results of several single-crystal X-ray determinations are reported. One metal nitrogen distance, that lying across from the two negatively charged bridging oxygen atoms, is 0,06 Angstrom longer than the others, suggesting an unusual trans influence at a lanthanide center. The formation of 1 is proposed to involve the intermediacy of Ln(Tp(Me2))(2)OH formed by protonolysis with adventitious water.
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页码：6761 / 6768
页数：8
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