Synthesis and Molecular Structures of Hydrotris(dimethylpyrazolyl)borate Complexes of the Lanthanides

Autor:	Graham H. Maunder, Sung-Ying Liu, Andrea Sella, Derek A. Tocher, Maya Stevenson
Rok vydání:	1996
Předmět:	Inorganic Chemistry Lanthanide Crystallography Denticity Coordination sphere Lanthanide trifluoromethanesulfonates Chemistry Coordination number Inorganic chemistry Ionic bonding Physical and Theoretical Chemistry Trifluoromethanesulfonate Monoclinic crystal system
Zdroj:	Inorganic Chemistry. 35:76-81
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic941469w
Popis:	The reaction of lanthanide triflates with 2 equiv of potassium hydrotris(dimethylpyrazolyl)borate (Tp(Me)()2) gives good yields of complexes of composition Ln(Tp(Me)()2)(2)OTf. For La (2), Ce (3), Pr (4), and Nd (5) the complexes are 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) Å, b = 12.740(2) Å, c = 18.163(3) Å, beta = 107.35(1) degrees, V = 3893(1) Å(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) Å, b = 13.671(5) Å, c = 8.746(2) Å, beta = 91.66(3) degrees, V = 1983(1) Å(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.
Databáze:	OpenAIRE
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