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Abstract: A new cobalt(II) phosphonate, [enH2]0.5[Co(pa)(H2O)]·H2O (1) (H3pa=hydroxy-phosphono-acetic acid, HO2CCH(OH)PO3H2; en=ethylenediamine), has been hydrothermally synthesized and structurally characterized. Compound 1 has a honeycomb-like layer structure which is composed of CoO6 octahedra and μ3-pa ligands with the protonated en and lattice water molecules stabilized between the layers. Magnetic studies indicate that 1 shows weak ferromagnetic behavior, spin-glass behavior, and metamagnetic behavior. [Copyright &y& Elsevier]

Abstract: Hydrothermal treatment of a mixture of H3imdc (4,5-imidazoledicarboxylic acid), Na2SO4, Dy(NO3)3·6H2O and NaOH generated a novel inorganic–organic hybrid framework, {[Dy2(SO4)(Himdc)2(H2O)5]·H2O}n (1). Its crystal structure contains alternately arranged 1D left- and right-handed helical {Dy(Himdc)}n chains, each helical chain is composed of alternately arranged Dy(1) and Dy(2) ions connected by Himdc2– with bis(bidentate) linking mode. Every three helical chains are bridged by inorganic SO4 2− anions, which link Dy3+ ions in a tris(monodentate) mode to form a 3D framework. Compound 1 displays intense yellow photoluminescence corresponding to the characteristic 4F9/2 → 6HJ transitions of the Dy3+ ion. [Copyright &y& Elsevier]

Abstract: A new 2D coordination polymer with the formula [Co4(μ3-OH)2(H2nip-2H)2(H2nip-H)2(bpe)2] n (1) (H2nip=5-nitro-isophthalic acid, bpe= trans-1,2-bis(4-pyridyl)ethylene), has been hydrothermally synthesized and structurally characterized. The structure of 1 is built around uncommon, rhombic {Co4} clusters with double T d and double O h Co(II) geometries, which are extended into 2D network by the rigid deprotonated H2nip and bpe bridges. Magnetic property study indicates there is weak antiferromagnetic coupling interaction between Co(II) ions, which mainly arises from the antiferromagnetic coupling interaction in the tetramer, based on the nature of the μ3-hydroxyl group and syn–syn carboxylate-bridged modes. [Copyright &y& Elsevier]