共 44 条
Novel bright blue emissions IIB group complexes constructed with various polyhedron-induced 2-[2′-(6-methoxy-pyridyl)]-benzimidazole derivatives
被引:8
作者:

Chen, Shuo
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机构:
Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China

Fan, Rui-Qing
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机构:
Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China

Wang, Xin-Ming
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机构:
Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China

Yang, Yu-Lin
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h-index: 0
机构:
Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China
机构:
[1] Harbin Inst Technol, Dept Chem, Harbin 150001, Peoples R China
基金:
中国国家自然科学基金;
关键词:
SPECTROSCOPIC CHARACTERIZATION;
BENZIMIDAZOLE DERIVATIVES;
METAL-COMPLEXES;
LIGANDS;
FLUORESCENCE;
POLYMERS;
ZN(II);
2-(2-PYRIDYL)BENZIMIDAZOLE;
SPECTRA;
STATE;
D O I:
10.1039/c4ce00382a
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Five IIB group complexes, [(ZnLCl2)-Cl-1] (1), {[(CdLCl2)-Cl-1]}(2) (2), [Cd(L-1)(2)(NO3)(2)]center dot H2O (3), [(HgLCl2)-Cl-1] (4), and [(ZnLCl2)-Cl-2] (5) [L-1 = 1-[2-(6-methoxy-2-pyridylmethyl)]-2-[2-(6-methoxy-pyridyl)]benzimidazole; L-2 = 2-[2-(6-methoxypyridyl)]benzimidazole] have been synthesized and structurally characterized by elemental analysis, IR spectroscopy, H-1 NMR, C-13 NMR and X-ray single-crystal analyses. The structural investigations testify that the ionic radius and counterions (Cl(-)and NO3-) cooperatively affect the coordination mode of central metal. As small and medium radii, four-coordinated Zn2+ (1 and 5) and five-coordinated Cd2+ (2) possess tetrahedron and trigonal bipyramid geometries, respectively. Though Hg2+ (4) has a larger radius, its three-coordinated geometry is trigonal planar in order to eliminate repulsive forces. Further observations illustrate that Cd2+ (3) is bound to two ligands L-1 when NO3- is the counter anion, forming seven-coordinated monocapped trigonal prismatic geometry. Complexes 1-5 display bright blue luminescence with the emission maxima (lambda(max)) ranging from 399 to 499 nm at 298 K, depending on the N,N'-chelating ligand-centered pi* -> pi transition. Upon cooling to 77 K, the complexes show rich structured emission profiles compared to those at 298 K. The emission lifetimes of L and 1-5 are on the microsecond scale. The emission efficiency of 1-5 is shown by quantum yields ranging from 0.23 to 0.40. Complexes 1-5 offer a good insight into the opportunities in the utilization of blue materials for application and function.
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页码:6114 / 6125
页数:12
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