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

被引:46
作者
Liu, SY [1 ]
Maunder, GH [1 ]
Sella, A [1 ]
Stevenson, M [1 ]
Tocher, DA [1 ]
机构
[1] UNIV LONDON UNIV COLL,CHRISTOPHER INGOLD LABS,DEPT CHEM,LONDON WC1H 0AJ,ENGLAND
关键词
D O I
10.1021/ic941469w
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
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.
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页码:76 / 81
页数:6
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