Poly[tris(μ-2-aminobenzene-1,4-dicarboxylato)tetrakis(N,N-dimethylformamide)diyttrium(III)]
2011
The asymmetric unit of the title coordination polymer, [Y2(C8H5NO4)3(C3H7NO)4]n, contains one Y3+ ion, three half-molecules of the 2-aminobenzene-1,4-dicarboxylate (abz) dianion and two O-bonded N,N-dimethylformamide (DMF) molecules. Each abz half-molecule is completed by crystallographic inversion symmetry and its –NH2 group is disordered in each case [relative occupancies within the asymmetric unit = 0.462 (18):0.538 (18), 0.93 (2):0.07 (2) and 0.828 (16):0.172 (16)]. The combination of disorder and crystal symmetry means that each of the four C—H atoms of the benzene ring of each of the dianions bears a statistical fraction of an –NH2 group. The coordination geometry of the yttrium ion is a fairly regular YO8 square antiprism arising from its coordination by two DMF molecules, four monodentate abz dianions and one O,O-bidentate abz dianion. The polymeric building unit is a dimeric paddle-wheel with two metal ions linked by four bridging abz dianions. Further bridging linkages connect the dimers into a three-dimensional framework containing voids in which highly disordered DMF molecules are presumed to reside.
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