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In this work, a series of new metal phosphonates were hydrothermally synthesized and structurally characterized based on m-xylylenediphosphonic acids(H4L), including[M(H2L)(bpy)](M = Mn 1, Co 2), [MH2L)(phen)](M = Co3, Cu 4), and [Cu2(H2L)2(bpy00)2] 5(bpy = 2,20-bipyridine,phen = 1,10-phenanthroline, bpy00= 4,40-dimethyl-2,20-bipyridine). X-ray diffraction indicated that compounds 1 and2 were isomorphic. Complexes 3 and 4 were shown to crystallize in different space groups but had similar crystallographic units. In the complexes, H4 L was seen to partially deprotonate to afford H2L2-. The H2L2-ligands in 1–4functioned as tetradentate ligands with each phosphonate group adopting bidentate coordination mode with two M centers to generate a 2D layer. In addition, the H2L2-anions in5 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.
In this work, a series of new metal phosphonates were hydrothermally synthesized and structurally characterized based on m-xylylenediphosphonic acids (H4L), including [M (H2L) (bpy)] (M = Mn1, Co2) (bpy = 2,20-bipyridine, phen = 1,10-phenanthroline, bpy00 = 4,40-dimethyl- 2,20-bipyridine). X-ray diffraction indicated those compounds 1 and 2 were isomorphic. Complexes 3 and 4 were shown to crystallize in different space groups but similar crystallographic units. In the complexes, H4 L was seen to partially deprotonate to afford H2L2-. The H2L2-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 H2L2-anions in5 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.