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Facile pyrazolylborate ligand degradation at lanthanide centers: X-ray crystal structures of pyrazolylborinate-bridged bimetallics.
6761 - 6768.
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.
|Title:||Facile pyrazolylborate ligand degradation at lanthanide centers: X-ray crystal structures of pyrazolylborinate-bridged bimetallics|
|Keywords:||HETEROLEPTIC POLYPYRAZOLYLBORATE DERIVATIVES, LN = CE, MOLECULAR-STRUCTURE, POLY(PYRAZOLYL)BORATE DERIVATIVES, POLY(PYRAZOL-1-YL)BORATE COMPLEXES, HYDROTRIS(PYRAZOLYL)BORATE LIGAND, CARBOXYLATE COMPLEXES, CARBONIC-ANHYDRASE, SAMARIUM COMPLEX, STERIC CONTROL|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
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