Tetra-kis(μ-2,4-difluoro-benzoato)bis-[(2,2'-bipyridine)(2,4-difluoro-benzoato)terbium(III)]

Abstract

In the centrosymmetric dinuclear title compound, [Tb(2)(C(7)H(3)F(2)O(2))(6)(C(10)H(8)N(2))(2)], the Tb(III) ion is coordinated by an N,N'-bidentate 2,2'-bipyridine mol-ecule, and two O,O'-bidentate 2,4-difluoro-benzoate (dfb) anions. One of the latter also bonds to the second Tb(III) centre through one of its O atoms. The third dfb anion bonds to one Tb atom from each of its O atoms. Thus, the three dfb species have three different coordination modes. This results in an irregular TbN(2)O(7) coordination sphere for the metal ion. The F atoms and their associated H atoms in the simple bidentate dfb anion are disordered over two sets of sites in a 0.672 (10):0.328 (10) ratio.

Fig. 1.

A view of the molecular structure of (I), showing 30% probability displacement ellipsoids. Symmetry code: (i) –x +1, –y + 2, –z + 1.