Publication Date:
2014-02-13
Description:
Two new cadmium(II) coordination compounds, [Cd 4 (SBTC) 2 (2,2′-bpy) 6 (H 2 O) 4 ](2,2′-bpy) ( 1 ) (2,2′-bpy = 2,2′-bipyridyl) and {[K 2 Cd(SBTC)(H 2 O) 4 ](H 2 O) 2 } n ( 2 ), were synthesized using a novel ligand of 5-sulfonyl-1,2,4-bezenetricarboxylic acid (H 4 -SBTC) featuring three carboxylate groups and one sulfonate group stationed on a phenyl central motif. Compound 1 is a discrete tetranuclear [Cd 4 (SBTC) 2 (2,2′-bpy) 6 (H 2 O) 4 ] structure with a solvated 2,2′-bpy molecule, wherein the four cadmium ions are bridged by two μ 3 -SBTC 4– ligands. The discrete tetranuclear [Cd 4 (SBTC) 2 (2,2′-bpy) 6 (H 2 O) 4 ] motif is extended into a three-dimensional (3D) supramolecular framework through hydrogen bonds and π–π interactions. In compound 2 the cadmium ions and potassium ions are interconnected by the SBTC 4– ligands and bridging water molecules to give a complex 3D structure. The 3D structure is constructed by a rare 3D inorganic cadmium-potassium-oxide framework, in which the cadmium and potassium ions are bridged by the sulfonate groups and bridging water molecules. In the solid state, compounds 1 and 2 exhibit photoluminescence with emission maximum at 380 and 445 nm, respectively.
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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