Some B–B linked ‘back-to-back’ bis[tris(pyrazolyl)borate] bridging ligands [(Rpz)3B–B(Rpz)3] (where Rpz is 3-R-pyrazolyl) have been prepared: when R=H or Me the ligands have two terdentate compartments, and have been used to prepare a variety of molybdenum complexes; when R=2-pyridyl, the ligand has two B–B linked hexadentate cavities which each bond a lanthanide(III) ion.
N. C. Harden, J. C. Jeffery, J. A. McCleverty, L. H. Rees and M. D. Ward, New J. Chem., 1998, 22, 661 DOI: 10.1039/A803034K
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