This article describes the design, synthesis, and identification of a new copper complex of Si-propyl-bis(pyridin-3-ylmethyl)carbamimidothioate (bis(PYT)) on mesoporous KIT-6 (KIT-6@bis(PYT)-Cu) as a recyclable heterogeneous catalyst. At first, mesoporous silica KIT-6 was formed form P123 (as a conducting agent) and tetraethylorthosilicate (TEOS, as a source of silica) in acidic conditions. Also, 3-iodopropyltrimethoxysilane (IPTMS) was obtained through simple SN2 reaction of KI and 3-chloropropyltrimethoxysilane (CPTMS). Then, the surface of mesoporous silica KIT-6 was modified by IPTMS and further functionalized by bis(PYT), for ability for immobilize of copper ions. At final step, copper was immobilized on the surface of functionalized KIT-6 (KIT-6@bis(PYT)-Cu) and identified by various techniques e.g. FTIR, SEM, TGA, EDS, XRD, WDX, BET, and AAS. In the next part, KIT-6@bis(PYT)-Cu catalyst was investigated as an effective homoselective catalyst for the synthesis of tetrazoles. All tetrazole products were identified by NMR spectroscopy. The KIT-6@bis(PYT)-Cu catalyst efficiently separated from the mixture of the reaction and recycled several times.
