Synthesis and molecular structures of hydrotris(dimethylpyrazolyl)borate complexes of the lanthanides
- Christopher Ingold Labs., London (United Kingdom); and others
The reaction of lanthanide triflates with 2 equiv of potassium hydrotris(dimethylpyrazoly)borate (Tp{sup Me}{sub 2}) gives good yields of complexes of composition Ln(Tp{sup Me}{sub 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/c with a = 17.629(3) {angstrom}, b = 12.740(2) {angstrom}, c = 18.163(3) {angstrom}, {beta} = 107.34(1){degrees}, V = 3893(1) {angstrom}{sup 3}, Z = 4, and R{sub 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}, c = 8.746(2) {angstrom}, {beta} = 91.66(3){degrees}, V = 1983(1) {angstrom}{sup 3}, Z = 2, and R{sub w} = 0.0416. In solution, however, complex 6 adopts a seven-coordinate molecular structure with the triflate ion within the first coordination sphere.
- OSTI ID:
- 255628
- Journal Information:
- Inorganic Chemistry, Vol. 35, Issue 1; Other Information: PBD: 3 Jan 1996
- Country of Publication:
- United States
- Language:
- English
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