Publication Date:
2014-11-05
Description:
In this work, a series of new metal phosphonates were hydrothermally synthesized and structurally characterized based on m -xylylenediphosphonic acids (H 4 L), including [M(H 2 L)(bpy)] (M = Mn 1 , Co 2 ), [MH 2 L)(phen)] (M = Co 3 , Cu 4 ), and [Cu 2 (H 2 L) 2 (bpy″) 2 ] 5 (bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, bpy″ = 4,4′-dimethyl-2,2′-bipyridine). X-ray diffraction indicated that compounds 1 and 2 were isomorphic. Complexes 3 and 4 were shown to crystallize in different space groups but had similar crystallographic units. In the complexes, H 4 L was seen to partially deprotonate to afford H 2 L 2− . The H 2 L 2− ligands in 1 – 4 functioned as tetradentate ligands with each phosphonate group adopting bidentate coordination mode with two M centers to generate a 2D layer. In addition, the H 2 L 2− anions in 5 functioned as tridentate ligands with one phosphonate group adopting the bidentate mode and another phosphonate group adopti ng the monodentate mode, thus linking three Cu atoms to provide a 1D chain. The IR and thermal stabilities of these compounds were subsequently examined.
Print ISSN:
1001-6538
Electronic ISSN:
1861-9541
Topics:
Natural Sciences in General
