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Synthesis and molecular structures of hydrotris(dimethylpyrazolyl)borate complexes of the lanthanides

Liu, SY; Maunder, GH; Sella, A; Stevenson, M; Tocher, DA; (1996) Synthesis and molecular structures of hydrotris(dimethylpyrazolyl)borate complexes of the lanthanides. INORG CHEM , 35 (1) 76 - 81.

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Abstract

The reaction of lanthanide triflates with 2 equiv of potassium hydrotris(dimethylpyrazolyl)borate (Tp(Me2)) gives good yields of complexes of composition Ln(Tp(Me2))(2)OTf. For La (2), Ce (3), Pr (4), and Nd (5) the complexes ate seven-coordinate in the solid state with the triflate group coordinated to the metal in unidentate fashion. Complex 5 crystallizes in the monoclinic space group P2(1)/c with a = 17.629(3) Angstrom, b = 12.740(2) Angstrom, c = 18.163(3) Angstrom, beta = 107.35(1)degrees, V = 3893(1) Angstrom(3), Z = 4, and R(w) = 0.0458. For the complexes of Y (1), Sm (6), Eu (7), Gd (8), Dy (9), Ho (10), and Yb (11), the smaller size of the metal ion leads to ejection of the triflate from the coordination sphere and the complexes are ionic in the solid state with a six-coordinate metal center. Complex 11 crystallizes in the monoclinic space group C2/m with a = 16.593(7) Angstrom, b = 13.671(5) Angstrom, beta = 91.66(3)degrees, V = 1983(1) Angstrom(3), Z = 2, and R(w) = 0.0416. In solution, however, complex 6 adopts a seven-coordinate molecular structure with the triflate ion within the first coordination sphere.

Type:Article
Title:Synthesis and molecular structures of hydrotris(dimethylpyrazolyl)borate complexes of the lanthanides
Keywords:X-RAY CRYSTAL, HETEROLEPTIC POLYPYRAZOLYLBORATE DERIVATIVES, LN = CE, POLY(PYRAZOLYL)BORATE DERIVATIVES, IONS, TRIS<HYDRIDOTRIS(PYRAZOL-1-YL)BORATO>YTTERBIUM(III), TROPOLONATE, CHEMISTRY, YB
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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