【摘 要】
：
Synthesized and characterized a series of lanthanide complexes [Ln(3,4,5-TEOBA)3phen]2(Ln=La(1),Pr(2),Nd(3),Sm(4),Eu(5); 3,4,5-TEOBA=3,4,5-Triethoxybenzoic acid; phen=1,10-phenanathroline).Single crys
【机 构】
：
Testing and Analysis Center,Hebei Normal University,Shijiazhuang 050024,P.R. China;College of Chemis
【出 处】
：
第十七届全国化学热力学和热分析学术会议
论文部分内容阅读
Synthesized and characterized a series of lanthanide complexes [Ln(3,4,5-TEOBA)3phen]2(Ln=La(1),Pr(2),Nd(3),Sm(4),Eu(5); 3,4,5-TEOBA=3,4,5-Triethoxybenzoic acid; phen=1,10-phenanathroline).Single crystal X-ray diffraction data and XRD show all the complexes are isostructural.Every complexe has two center metal and each center is coordinated by six oxygen atoms and two nitrogen atoms to form a distorted monocapped square antiprism geometry.Oxygen atoms adopt three modes coordinated with center metal: bidentate chelate,bridging bidentate and bridging tridentate.Photoluminescence properties of complexes 4 and 5 have been measured at room temperature and display the characteristic emission of Sm3+ and Eu3+ ions.Using TG/DSC-FTIR technology studied the thermal decomposition of title complexes and indicate five complexes are thermally stable.The heat capacities of complexes 1-5 has been measured by DSC in the temperature range from 263.15 to 463.15 K.During 280-350K,there exist a solid-to-solid phase transition for complexes 1,2 and 5,which was further evidenced by four thermal circulating processes with the rate of 10 K/min.In the heating and cooling runs,supercooling was observed and the enthalpies of endothermic and exothermic behave differently.Antibacterial activity of complexes were measured and studied.
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