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.
