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Synthesis of 5-(diethylamino)-2-(5-nitro-1H-benzimidazol-2-yl)phenol metal complexes. Reagent and condition: (a) DMF: POCl3, 60°C, 6h, 65% yield, (b) Ethanol (10 Vol.), PCl3 (0.01 mole), 60°C; 79% Yield, (c) Metal salt [Co(OAc)2, Cu(OAc)2, Ni(OAc)2, FeSO4·7H2O]; Methanol (5 Vol.), Triethyl amine (3-4 drop); Room temperature; 73% Yield.
