Three coordination polymers built from planar tetranuclear clusters and 5-sulfoisophthalic acid

Abstract

Three coordination polymers built from planar tetranuclear clusters and H3sip ligands, Pb2Cl(sip)(bipy) (1), Pb2Br(sip)(H2O) (2), and Ni4(sip)2(pyz)2(H2O)8(OH)2·2H2O (3) (H3sip = 5-sulfoisophthalic acid, bipy = 2,2′-bipyridine, and pyz = pyrazine), have been hydrothermally synthesized and characterized by IR, TGA, and single-crystal X-ray diffraction. Compound 1 features a 2-D layer-like structure containing tetranuclear square [Pb4(SO3)2] clusters. Complex 2 has a 3-D open framework architecture constructed from tetranuclear cluster [Pb4Br2(SO3)2] inorganic building blocks. The tetranuclear units, [Ni4(OH)2(COO)4], in 3 are interlinked through carboxylates and µ2-pyz ligands to generate a 2-D layer structure. The connecting modes between tetranuclear clusters and organic ligands in the three compounds are discussed in this article. In the solid state at room temperature, yellow photoluminescence in 1 and 2 are observed.