Novel Co5 Cluster Based Triazole Bridged Cobalt-Fluorophosphate: Synthesis, Structure, Magnetic and Heterogeneous Catalytic Epoxidation Studies

A novel triazole bridged cobalt fluorophosphate coordination polymer with the formula {Co-5(1,2,4-triazole)(2)(OH)(2)(PO3F)(4)}(n) has been synthesized. Single crystal X-ray studies reveal that the compound comprises of Co-5 clusters which ultimately build the whole framework, here all cobalt centers are in octahedral geometry established from continuous shape analysis. All the cobalt centers are in Co(II) oxidation state and the results are supported by the bond valence sum (BVS) calculation. The sample has been characterized by single crystal X-ray, powder X-ray, FTIR and TGA analysis. The compound was tested for olefin catalysis performance and magnetism. Magnetization measurements reveal overall antiferromagnetic interactions among the Co(II) ions. The compound is very active in the catalytic transformation of olefins to their corresponding epoxides. Catalytic epoxidation studies reveal that cyclohexene and styrene can be converted up to 97 % with almost 65 % selectivity of products with higher TON numbers.

Automated summary

A novel triazole bridged cobalt fluorophosphate coordination polymer has been synthesized and characterized. The compound consists of Co-5 clusters that build the whole framework, with all cobalt centers in octahedral geometry. The compound shows antiferromagnetic interactions among the Co(II) ions and exhibits high catalytic activity in the conversion of olefins to their corresponding epoxides, with a selectivity of up to 65% and high TON numbers.