Increased catalytic activity through ZnMo(7)O(24)/g-C(3)N(4) heterostructured assemblies for greener indole condensation reaction at room temperature

As an economical conjugated polymer, graphitic carbon nitride (g-C(3)N(4)) has recently attracted much attention due to its exciting chemical and thermal stability and easy availability. Herein, we constructed a metal-coordinated graphitic carbon nitride (M–g-C(3)N(4)) catalyst through simple impregnation and calcination methods and used it as a new heterogeneous catalyst for the efficient synthesis of bis (indolyl) methanes and trisindolines under mild conditions. This reaction is performed efficiently in water as an environmentally friendly solvent at ambient conditions. The ZnMo(7)O(24)/g-C(3)N(4) nanocomposite was synthesized by a simple method by immobilizing Mo(7)O(24)(NH(4))(6)·4H(2)O and ZnCl(2) on the surface of g-C(3)N(4) under hydrothermal conditions. It was characterized by FT-IR, EDS, and electronic scanning microscopy (SEM). The metal doping of Mo and Zn on the surface of graphitic carbon nitride leads to the formation of a green catalyst that gives good to excellent yields of products in short reaction times with an easy working procedure. In addition, the ZnMo(7)O(24)/g-C(3)N(4) catalyst could be reused at least five runs without apparent loss of efficiency.