摘要
Epoxides are an extremely important class of chemical intermediates in the chemical industry due to the versatility of epoxides in preparing many fine and specialty chemicals.However,designing more active and selective heterogeneous catalysts in epoxidation is still a priority and a challenge.In this work,we demonstrate the synthesis of two new Ag/polyoxometalate-based coordination polymers(Ag_(8)(mttz)_(4)(H_(2)O)[PWVWVI 11O_(4)0]·H_(2)O(1)and Ag_(8)(mttz)4(H_(2)O)[PMo^(V)Mo^(VI)11O_(4)0](2),mttz=5-methylthio-2Htetrazole)that are highly active for the selective oxidation of cis-cyclooctene to epoxycyclooctane under mild conditions(solvent-free,atmospheric pressure,70℃with H_(2)O_(2)as the oxidant under visible light).It is worth noting that compound 1 possesses abundant exposed active edge sites of Ag,resulting in the catalytic performance achieved in the selective oxidation of cis-cyclooctene to epoxycyclooctane being superior to its components(metal,polyoxometalates and ligand)and compound 2 with the conversion/selectivity to epoxycyclooctane of 70.15/99.68%,respectively.The excellent photocatalytic activity of compound 1 should be attributed to the synergy of the components after coordination polymerization and its structure with exposed active edge sites of Ag.
基金
supported by the Collaborative Innovation Center of Suzhou Nano Science and Technology,the National Natural Science Foundation of China(51725204,51572179,21471106,21771132,21501126)
China Petrochemical Corporation(SINOPEC,417004-1)
the Natural Science Foundation of Jiangsu Province(BK20161216)
the 111 Project and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
