Synthesis, crystal structures, spectroscopic, thermal analysis, electrochemical and solution studies of two new mixed metal coordination polymers based on dipicolinic acid and 3,4-diaminopyridine
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- 作者：Zohreh Derikv ; Giuseppe Bruno ; Hadi Amiri Rudbari ; Ardeshir Shokrollahi ; Fereshteh Zarghampour ; Azadeh Azadbakht
- 关键词：Heterometallic coordination polymer ; Electrochemical behaviors ; Solution studies ; Dipicolinic acid
- 刊名：Inorganica Chimica Acta
- 出版年：30 January, 2014
- 年：2014
- 卷：410
- 期：Complete
- 页码：221-229
- 全文大小：1432 K
文摘
Two new 2D heteronuclear coordination polymers with Ni(II), Zn(II) and Ca(II), namely {(dapH)2[CaM2(pydc)4(H2O)2]路2H2O}n (M = Ni (1) and M = Zn (2)) where [pydcH2 = pyridine-2,6-dicarboxylic acid (dipicolinic acid), dap = 3,4-diaminopyridine] have been synthesized and characterized by elemental analysis, infrared spectroscopy, thermal (TG/DTG/DTA) analysis, electrochemical as well as X-ray single crystal diffraction. The compounds 1 and 2 display isostructural features and crystallized in the monoclinic P21/n space group. Both of the compounds contain cationic and anionic fragments and two uncoordinated water molecules. In 1 and 2 (pydc)2鈭?/sup> acts as tridentate ligands and connected to calcium ions through carboxylate bridging. Then each dipicolinate ligand bridges one calcium to a M(II) atom.
The equilibrium constants of the binary, ternary and quaternary complexes of ligands or proton transfer system with metal ions in an aqueous solution were investigated by a potentiometric pH titration method.