Preparation and structure of tetrakis(indolo[2,3-b]quinoxalinato)dinickel(II)

Article abstract of DOI:10.1246/cl.2000.614

Treatment of 6H-indolo[2,3-b]quinoxaline (1) with NaBH₄ in ethanol at 82 °C for 10 min under argon gives the reactive anion species 2 (generated by deprotonation of N-6 position of 1), which upon reaction with Ni(OAc)₂·4H₂O in ethanol at 82 °C for 6 h under argon forms the title dinuclear nickel(II) complex 3. The molecular structure of the novel complex 3, indicating the Ni-Ni distance of 2.618(1) A, is reported.