Access to transition metal complexes of phosphine-NHC based hybrid ligand

Abstract

C4-bound N-heterocyclic carbene (NHCs) referred to as ‘abnormal’ carbenes grabs considerable attention among the researchers as the zwitterionic form of C-4 bound carbenes are stronger sigma donor than classical C-2 bound carbenes. Moreover, the C-4 position of NHC ligands can be further utilized as an additional functionalization to develop the bimetallic and multimetallic architectures. Inspired by this concept, many researchers are actively working on development of homobimetallic and heterobimetallic NHC-based complexes which are significantly useful in tandem reactions. Donor ability act along with stable bond formation with transition metals (TM) forges them a brilliant ligand in coordination chemistry. Herein, C-4 bound phosphine NHC based transition metal complexes (IDIPP-PPh2)FeCl3, (IDIPPPPh2)NiCl2 , (IDIPP-PPh2)CoCl2, (IDIPP-PPh2)FeCl2, (IDIPP-PPh2)NiBr2, (IDIPPPPh2)FeBr2, (IDIPP-PPh2(S))CuCl, (IDIPP-PPh2(Se))CuCl and heterobimetallic complex (IDIPP-PPh2)PdCl2[CuCl] have been synthesized. NMR, HRMS investigations have been carried out for confirmation. The as-prepared complexes are highly stable at room temperature. Their catalytic activity can be explored further.