Syntheses, structures, and luminescent properties of copper(II) complexes based on 2,6-bis(imino)pyridyl ligands
Syntheses, structures, and luminescent properties of copper(II) complexes based on 2,6-bis(imino)pyridyl ligands
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基于2,6-双(亚氨基)吡啶基配体的铜(II)配合物的合成、结构和发光性质
DOI：
10.1016/j.poly.2010.07.012
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发表时间：
2010-09-22
期刊：
影响因子：
2.6
通讯作者：
Hasi, Wuliji
中科院分区：
文献类型：
--
作者：
Fan, Rui-Qing;Wang, Ping;Hasi, Wuliji
合成了一系列五配位的2，6-双亚氨基吡啶铜配合物[2，6-（ArN=CMe）（2）C（5）H（3）N-CuCl（2）中心点nCH（3）CN]（Ar = 4-MeC（6）H（4），n = 0.5，Cu1; Ar = 2，6-Et（2）C（6）H（3），n = 1，Cu2; Ar = 2，4，6-Me（3）C（6）H（2），n = 1，Cu3; Ar = 2，6-Me（2）C（6）H（3），n = 0，Cu4; Ar = 2-MeC（6）H（4），n = 1，Cu 5）在乙腈中分别与CuCl（2）中心点2 H（2）O反应，合成了一系列新的配体.通过单晶X-射线衍射确定了5个配合物的结构。在所有的配合物中，金属中心被配体三齿螯合，并进一步由两个氯原子配位，导致扭曲的三角双锥几何形状的Cu 1，Cu 3，Cu 4，和Cu 5，分别为，和近似正方锥几何形状的Cu 2。在298 K的二氯甲烷溶液中，所有配合物在478-499 nm处均呈现蓝绿色发光，这可能是由配体中心的π * -> π跃迁引起的。然而，配合物Cu 1-Cu 5的荧光发射明显弱于配体，这可能是由于通过顺磁性Cu（II）中心的荧光团-猝灭剂相互作用。(C)2010爱思唯尔有限公司版权所有。
A series of five-coordinated 2,6-bis(imino)pyridyl Cu(II) complexes, [2,6-(ArN=CMe)(2)C(5)H(3)N-CuCl(2)center dot nCH(3)CN] (Ar = 4-MeC(6)H(4), n = 0.5, Cu1; Ar = 2,6-Et(2)C(6)H(3), n = 1, Cu2; Ar = 2,4,6-Me(3)C(6)H(2), n = 1, Cu3; Ar = 2,6-Me(2)C(6)H(3), n = 0, Cu4; Ar = 2-MeC(6)H(4), n = 1, Cu5), were synthesized in acetonitrile by reactions of the corresponding bis(imino)pyridine ligands with CuCl(2)center dot 2H(2)O, respectively. The structures of five complexes were determined by single-crystal X-ray diffraction. In all complexes, the metal center is tridentately chelated by ligand and further coordinated by two chlorine atoms, resulting in distorted trigonal-bipyramidal geometry for Cu1, Cu3, Cu4, and Cu5, respectively, and approximately square-pyramidal geometry for Cu2. At 298 K in dichloromethane solution, all complexes exhibit blue-green luminescent emissions at about 478-499 nm, which could be attributed to ligand-centered pi* -> pi transitions. However, fluorescent emission of complexes Cu1-Cu5 is significantly weaker than those of ligands, which could be attributed to fluorophore-quencher interactions via paramagnetic Cu(II) center. (C) 2010 Elsevier Ltd. All rights reserved.