Synthesis and Spectra of Novel Metal Complexes of Multi-Nitrogen Heterocyclic Ligand
JIANG Xin1,2,WU Yi-qun1,3*,HE Chun-ying1
1. Functional Materials Lab, Heilongjiang University, Harbin 150080, China 2. College of Chemistry and Pharmacology, Jiamusi University, Jiamusi 154007, China 3. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract：Novel multi-nitrogen heterocyclic metal complexes M(HMPB)2 (M=Co, Ni) using 2-(2′-hydroxy-5′-methyl phenyl) benzotriazole (HMPB) as ligand, were synthesized by the methanol aqueous solution precipitation method for the first time. The as-prepared samples were characterized by element analysis and laser-desorption ionization time-of-flight mass spectrometry (LDI-TOF-MS). The Fourier transform infrared characteristic spectra (FTIR) and ultraviolet visible electronic absorption spectrum (UV-Vis) of the new complexes were also studied especially. The results show that the HMPB ligand coordinates with the center metal ions by nitrogen and oxygen atoms in the form of bidentate ligand, and the coordination number of the center metal ions is four in the complexes; FTIR characteristic absorption band of the complexes is located in the region of 400-2 500 cm-1. After the complexes formation, the stretching vibration of the hydroxy group of 2-(2′-hydroxy-5′-methyl phenyl) benzotriazole, the vibration peak of CN bond and the characteristic absorption of C─O bond showed distinct changes. The IR characteristic absorption peak positions of M─N and M─O bond were also confirmed. These complexes exhibited a strong absorption in the ultraviolet region and the maximum absorption peak located in the range of 335-345 nm.
Key words：Multi-nitrogen heterocyclic metal complexes;Synthesis;Infrared spectra;UV-Vis spectroscopy
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