A microporous coordination polymer with 1-D channels constructed from a basic reaction system

A ytterbium coordination polymer, {[Yb2(OH)2(atpt)2]·0.5H2O}n, (atpt = 2-aminoterephthalate) was synthesized by using the reaction of YbCl3·6H2O 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) Å, b = 7.8049(5) Å, c = 21.5601(12) Å, β = 111.481(3)°, V = 2056.1(2) Å3, 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 μ3-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.