Mixed-Ligand Coordination Complexes With Phenyl Acetate And Dipyridyl Compounds: Hydrothermal Synthesis, In Situ Metal/Ligand Reactions Of Phenyl Malonic Acid, And Crystal Structures

Nowadays the strategy to design and construct novel metal-organic architectures utilizing multifunctional building blocks upon reaction with various metal ions seems to be a marvelous success. In this presentation, ten novel coordination compounds, namely [Co(pa)2(3-bpo)2(H2O)2] (1), [Cd(pa)2(3-bpo)2(H2O)2] (2), [Co(pa)2(4-bpo)2- (H2O)2]·4H2O (3), [{Cd(pa)2(4-bpo)(H2O)}]n (4), {[Zn(pa)(4-bpo)(H2O)2]·[Zn(pa)2(4- bpo)(H2O)]}n (5), {[Mn(pa)2(4-bpo)(H2O)2]}n (6), {[Co(pa)2(4-bpo)(H2O)2]}n (7), {[Zn(pa)2(4-bpo)(H2O)2]}n (8), {[Ni(pa)2(4-bpo)(H2O)2]}n (9), and an unexpected {[Pb(pa)2(H2O)]}n (10), are prepared by the reaction of phenylacetic acid, derived via in situ reaction of phenylmalonic acid, and N-donor co-ligands, and different metal ions. All these complexes are characterized by the FT-IR, elemental analyses, and X-ray single-crystal diffractions.The results indicate that (1) the decarboxylation occurs easily to phenylmalonate under hydrothermal condition. (2) complexes 1, 2, 3 are zero-dimension structure, and the others are all one-dimension chain motif. Complexes 1, 2 are further linked by hydrogen bonds to form a one-dimensional chain, but 3, 4 to form a two-dimensional motif. Complexes 5~9 are three-dimensional supramocular networks via the hydrogen bonds. 10 is a one-dimension supramolecular structure having two distinct chains through hydrogen linkages. (3) in 4 carboxylate groups of the ligand act as a chelate mode and chelate-bridging in 10. While in others adopt a monodentate mode. (4) PbII prefer to form the 1-D chain with the hard base phenylacetata anion compared with the other transition metal ions.