Synthesis and crystal structures of cobalt(III) complexes containing pyridine-2-selenolato and its oxidation products

✍ Scribed by Masakazu Kita; Hiroshi Tamai; Fumi Ueta; Akira Fuyuhiro; Kazuaki Yamanari; Kiyohiko Nakajima; Masaaki Kojima; Katsuo Murata; Shinsuke Yamashita

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 172 KB
• Volume: 314
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(01)00304-8

✦ Synopsis

A series of mixed cobalt(III) complexes [Co(pySe) 3 -n (N N) n ] n + [pySe= pyridine-2-selenolato (1 -); N N= 1,2-ethanediamine (en) and 2,2%-bipyridine (bpy); n= 0, 1 and 2] was prepared. The geometrical preference and trans influence of pySe are fairly different from those of pyridine-2-thiolate. These selenolato complexes were oxidized by peracetic acid to give the corresponding pyridine-2-seleninato (pySeO 2 ) and pyridine-2-selenonato (pySeO 3 ) complexes. The crystal structures of the pySeO 2 and pySeO 3 complexes revealed that the coordination mode change from an original N,Se-four-membered to the N,O-five-membered chelate ring occurred during oxidation and intramolecular hydrogen bonds between the non-coordinated oxygen of pySeO 2 or pySeO 3 and the amine protons of en stabilize the N,O-coordination mode.