Synthesis And Properties Of Metal Coordination Complexes Including Proton Transfer Process Based On Pyridine-2,6-dicarboxylic Acid

Owing to the special physical properties, fluorescence, electricity, magnetism and antibacterial for instance, constructing such supramolecular coordination complex networks in collaboration with kinds of intermolecular forces has aroused wide interests in supramolecular chemistry. The proton transfer process is somewhat an effective method to combine different intermolecular forces, such as hydrogen bonding, coordination, electrostatic and π-π stack, into supramolecular networks which is of rather stable three dimensional spaces.In this paper, based on pyridine-2,6-dicarboxylic acid, two proton transfer compounds (pydaH2)(pydc) and (phenH)2(pydc) were synthesized, originated from2,6-diaminopyridine and1,10-phenanthroline respectively. Six novel complexes,(pydaH)2Eu(pydc)3-H5O2-2H2O,(pydaH)2Ni(pydc)2-H2O,(pydaH2)Co(pydc)2-6H2O,(pydaH)Fe(pydc)2-4H2O,(pydaH)2Cu (pydc)2-H2O, Cu(pydcH)2-3H2O, were obtained through the coordination of (pydaH2)(pydc) with Eu3+, Ni2+, Co2+, Fe3+, Cu2+.The structures of above-mentioned six metal-organic complexes were characterized by X-ray single crystal diffraction, infrared spectrum (IR), elemental analysis, and thermal analyzer(TGA). The fluorescence properties of complex (pydaH)2Eu(pydc)3-H5O2-2H2O and its Y3+(Ⅲ) doped complexes were measured by solid fluorescence spectrum. The magnetism properties of complex (pydaH)2Ni(pydc)2-H2O,(pydaH2)Co(pydc)2-6H2O,(pydaH)Fe(pydc)2-4H2O were mearsured by variable temperature magnetic susceptibility. And the biological antibacterial activities of complexes (pydaH)2Cu(pydc)2-H2O and Cu(pydcH)2"3H2O were mearsured by Kirby-Beuer.The results showed that, three-dimensional networks of proton transfer complexes were construced through the self-assembly process of weak intermolecular forces, hydrogen bonding, coordination, electrostatic and π-π stack, synergeticly. In addition, complex (pydaH)2Eu(pydc)3H5O2-2H2O emited strong monochrome fluorescence. The luminescence emission was sensitized by the doping of non-fluorescence ion Y3+. The magnetic test results of complexes,(pydaH)2Ni (pydc)2-H2O,(pydaH2)Co(pydc)2-6H2O,(pydaH)Fe(pydc)2-4H2O showed that, it was of weak antiferromagnetic coupling at lower temperature.The antibacterial activities of complexes (pydaH)2Cu(pydc)2-H2O and Cu(pydcH)2-3H2O against B.coli and S.aureus were weak.Another novel proton transfer complex including Eu3+, pyridine-2,6-dicarboxylic acid and1,10-phenanthroline, was synthesized through the coordination of (phenH)2(pydc) with Eu3+. The structures of complex were characterized by FT-IR, elemental analysis, and TGA. The fluorescence property and antibacterial activity were also investigated. The results showed that the complex was an ideal muti-functional rare earth composited materials with strong fluorescence emission and excellent antibacterial activity.