The Study Of Synthesis, Characterization And Reactivity Of Pyrazine-carboxylic Complexes And Polyoxometalaticligand Ruthenium Complexes

Metal coordination complexes have attracted interest due to their potential applications in photics, catalysis and magnetics. Here, we will describe the study of synthesis, characterization and reactivity of pyrazine-carboxylic complexes and polyoxometalaticligand ruthenium complexes.1. Treatment of pyrazine-2-carboxylic acid (pyzc) with Ni(OAc)2·4H2O under hydrothermal or reflux condition afforded [Ni(pyzc)2(H2O)2]·2H2O (1). Treatment of1with AgNO3afforded [Ag{Ni(pyzc)2(H2O)2}][NO3](2). Treatment of pyzc with two equivalent of BiPh3afforded [Bi4(Ph)4(pyzc)8](3). Complexes of1-3were characterized by elemental analyses, IR spectra, X-ray diffraction study or NMR spectra. Complex1is formally6-coordinated, of which NiⅡ atom located at the center of the pseudo-octahedral{NiO4N2} geometry. Two O atoms and two N atoms from two chelating pyzc ligands coordinate NiⅡ atom on equatorial plane, and two O atoms from coordinated water molecules occupy the axial positions. Complex2is a polymeric structure consisting of Ni(C4H3N2CO2)2(H2O)2units which linked into infinite chains by AgⅠ center via pyzc N atoms. The distance of Ag-N is2.255(7) A. The coordination environments of Ni(C4H3N2CO2)2(H2O)2units in2is similar with that of complex1. The combination of hydrogen bonding and weak Ag…O interactions in2serve to effectively link individual chains into a three-dimensional network. Complex3contains four Bi atoms. Each Bi atom is coordinated by two O atoms and one N atom from μ2, η2-pyzc ligand, and one O atom and one N atom from η2-pyzc ligand and one C atom from phenyl ligand.2. Treatment of polyoxometalatic ruthenium nitride complex (POM)Ru(=N)(POM=PW11O39/-) with Me3NO afforded ruthenium(Ⅱ) nitrosyl complex (POM)Ru(NO)(4), Irradiation of4with a Hg immersion lamp gave ruthenium(Ⅲ) complex (POM)Ru(H2O)(5). Treatment of5with PhICl2gave ruthenium(Ⅳ) complex (POM)RuCl (6). Complexs of4-6have been characterized by TG-DTG, IR, UV-vis and NMR spectra.