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The tetra-n-heptylammonium salts of transition-metal-substituted (TMS) Keggin type germanotungstates [(n-C7H15)4N]nGeW11MO39 (M = Mn2+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+, n = 5 or 6) were found to be efficient catalysts for cyclic carbonates synthesis from epoxides and CO2 under solvent-free and halogen-free condition. The catalytic activities were significantly influenced by the transition metal and...
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