title: Poly[diaqua-penta-kis(μ(4)-benzene-1,2-dicarboxyl-ato)(μ(3)-benzene-1,2-dicarboxyl-ato)tetra-thulium(III)].
abstract: The title compound, [Tm(4)(C(8)H(4)O(4))(6)(H(2)O)(2)](n), has been synthesized hydro-thermally. The asymmetric unit has four unique Tm(III) ions that are six-, seven-, eight- and nine-coordinate. The cations are inter-connected by bridging benzene-1,2-dicarboxyl-ate (BDC) anions to form an infinite two-dimensional framework, in which the BDC ligands adopt three different coordination modes. Adjacent sheets are further packed to form a three-dimensional supra-molecular framework through O-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, Teachers College of Qingdao University, Qingdao, Shandong 266071, People's Republic of China.
authors.forename: Guo-Ming
authors.initials: GM
authors.lastname: Wang
authors.forename: Chun-Sheng
authors.initials: CS
authors.lastname: Duan
authors.forename: Hui-Luan
authors.initials: HL
authors.lastname: Liu
authors.forename: Hui
authors.initials: H
authors.lastname: Li