Catecholato complexes of cobalt and nickel with 1,4-disubstituted-1,4-diazabutadiens-1,3 and 1,2-bis(diphenylphosphino)ethane

Journal of Chemical Sciences

Michael P Bubnov1 2¹  Anna V Cherkasova¹  Nikolay O Druzhkov¹  Irina A Teplova¹  Georgy K Fukin1¹  Vladimir K Cherkasov1¹ 

[1] G A Razuvaev Institute of Organometallic Chemistry of RAS, 603950 Tropinina str. 49, GSP-445, Nizhny Novgorod, Russia$$

关键词: Catecholates;    diazabutadienes;    cobalt;    nickel;    ligand exchange;    oxidation;    structural study.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Divalent cobalt and nickel form four-coordinate complexes with sterically hindered 3,6-di-tert-butylcatecholato dianion (3,6-DBCat) and neutral bidentate 1,4-disubstituted-1,4-diazabutadiens-1,3 (DAB). Structural study of (1,4-di-tert-butyl-1,4-diazabutadiene-1,3)(3,6-di-tert-butyl-catecolato)nickel and (1,4-bis-(2,6-di-iso-propylphenyl)-2,3-dimethyl-1,4-diazabutadiene-1,3)(3,6-di-tert-butyl-catecolato)cobalt indicates square-planar environment of metals. Chemical one-electron oxidation of nickel complexes proceeds through catecholate ligand and leads to o-semiquinonato adducts. EPR spectral parameters indicate preservation of square-planar configuration after oxidation. Complexes (DAB)M(Cat) (M = Ni, Co) undergo neutral ligand substitution reactions.

【 授权许可】

Unknown