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Title
Japanese: 
English:Complexation Properties and Structural Character of Lanthanides Complexes of O, N-Hetero Donor Ligand BIZA 
Author
Japanese: 小林徹, 阿久津 和宏, 中瀬正彦, 鈴木伸一, 矢板毅.  
English: Toru Kobayashi, Kazuhiro Akutsu, Masahiko Nakase, Shin-ichi Suzuki, Tsuyoshi Yaita.  
Language English 
Journal/Book name
Japanese: 
English:Seper Sci Technol 
Volume, Number, Page        
Published date 2019 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract Complexation properties of N-methyl-N-tolyl-2-(1H-benzimidazol-2-yl)pyridine-6-carboxamide (MeTolBIZA) with trivalent lanthanides were investigated by spectroscopic titration study and discussed based on structural character determined by X-ray crystallography. As a result, it is revealed that one or two MeTolBIZA molecules coordinate with lanthanide ions as tridentate ligand via two nitrogen atoms in 2-(1H-benzimidazol-2-yl)pyridine moiety and one oxygen atom in amide group. The stability constant of 1:2 metal–ligand complex decreases with increase of atomic number of lanthanide, and the 1:2 complex cannot be formed with heavier lanthanides. This result can be attributed to steric hindrance between ligand molecules.

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