科研之友
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摘要
A ytterbium coordination polymer, {[Yb-2(OH)(2)(atpt)(2)]center dot 0.5H(2)O} (n) , (atpt = 2-aminoterephthalate) was synthesized by using the reaction of YbCl3 center dot 6H(2)O with 2-aminoterephthalic acid under hydrothermal condition and structurally characterized by single-crystal X-ray diffraction method. The Yb(III) complex crystallizes in the monoclinic system P2/c with a=13.1306(9) angstrom, b=7.8049(5) angstrom, c=21.5601(12) angstrom, beta=111.481(3)degrees, V=2056.1(2) angstrom(3), Z=4. There are two crystallographically independent Yb3+ ions in the crystal, in which one is seven-coordinate, the other is eight-coordinate, and both of them are in oxygen environments. The ligand atpt adopts two coordination modes, bis(bridging bidentate) and bis(chelating and bridging tridentate). In addition, every hydroxyl group adopts mu(3)-O mode linking three Yb3+ ions. It is through the linkage of atpt and hydroxyl group that ytterbium ions are linked together to form a 3-D structure with an open metal-organic framework.
