Treatment of MCl2 (M = Ge or Sn) with 2,6-bis(benzimidazol-2-yl)pyridine (G-BZIMPY, G = NBn, N(3,5-CF3)Bn, NAllyl and O) yielded the self-ionization products [G-BZIMPYMCl][MCl3] (1-6) in high yields (75-98%). Reduction reactions are examined and the nickel complexes 8 and 9 ([(NBn-BZIMPY)2Ni][MCl3]2) are isolated from the reaction of Ni(COD)2 with 1 and 2 respectively. [NBn-BZIMPYSnCl][SnCl3] shows a significantly stronger MLCT band in the UV-vis absorption spectrum than its germanium counterparts, with germanium complexes exhibiting negative solvatochromism that is not observed in tin complexes.

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Journal Dalton Transactions
Swidan, A. (Ala'aeddeen), St Onge, P.B.J. (P.Blake J.), Binder, J.F. (Justin F.), Suter, R. (Riccardo), Burford, N. (Neil), & Macdonald, C.L.B. (2019). 2,6-Bis(benzimidazol-2-yl)pyridine complexes of group 14 elements. Dalton Transactions, 48(22), 7835–7843. doi:10.1039/c9dt00995g