Dimethyl
carbonate (DMC) is an important synthetic intermediate
with widespread applications in the chemical industry. In recent years,
the one-step conversion of CO2 into DMC has gained significant
attention, but the development of an efficient catalytic system remains
a considerable challenge to realize this process. Herein, a series
of organotin-oxometalate coordination polymers were developed for
DMC synthesis from CO2 and methanol without any solvent/dehydrating
agent, and it was found that the metal complexes displayed excellent
catalytic performances, especially (nBu3Sn)2MoO4 with the n-butyl
group (Bu) was very active, and a high DMC yield (15.7 mmol gcat
–1) and high TON value (3.90) were achieved
under mild conditions, which was remarkably higher than the recently
reported catalytic systems. Moreover, the polymer was highly stable
and easy to be recycled with no significant activity loss. Experimental
and in situ FT-IR studies revealed that the synergetic catalysis of
[Bu3Sn]+ and [MoO4]2– to active CO2 and methanol was the key reason for improved
catalytic activity. This study offers a promising strategy for the
efficient synthesis of organic carbonates catalyzed by metal complexes
to realize better CO2 utilization.