Syntheses and Crystal Structures of Two New Metal Phosphonates: [Mn(H2O)(2)(C12H8N2)(HO3PCH2CH2CO2)] and [Co(H2O)(4)(C10H8N2)]center dot(HO3PCH2CH2CO2)

By the reactions of manganese(II) acetate, 2-sulfoethylphosphonic acid, 1,10-phen (1,10-phen = 1, 10-phenanthroline) or cobalt(II) acetate, 4,4'-bipy and 2-carboxyethylphosphonic acid, two novel compounds of [Mn(H2O)(2)(C12H8N2)(HO3PCH2CH2CO2)] (1) and[Co(H2O)(4) (C10H8N2)]center dot (HO3PCH2CH2CO2) (2) have been synthesized and characterized by IR spectroscopy, elemental analyses and single-crystal X-ray diffraction. Compound 1 has a 0D structure. Two Mn(II) ions are linked by two 2-carboxyethylphosphonic acid ligands, forming a centrosymmetric dimer. These dimers are further interlinked into a 2D layer structure by pi-pi stacking interactions and hydrogen bonds. Compound 2 has a 1D chain structure. The 2-carbo-xyethylphosphonic acid remains uncoordinated and acts-as the organic template. By the bridge of 4,4'-bipy, the [Co(4,4'-bipy)](2+) chains are formed.