Silver(I) and copper(I) complexes supported by fully fluorinated 1,3,5-triazapentadienyl ligands

Synthesis of the perfluorinated 1,3,5-triazapentadiene [N{(CF3)C(C6F5)N}(2)]H and the use of its conjugate base as a supporting ligand for the isolation of silver(I) and copper(I) complexes are reported. Some of the related chemistry involving [N{(C3F7)C(C6F5)N}(2)](-) (that has bulkier -C3F7 groups on the 1,3,5-triazapentadienyl ligand backbone) is also presented. X-ray crystallographic data show a wide variety of structures ranging from intermolecular, hydrogen-bonded chain structure for [N{(CF3)C(C6F5)N}(2)]H with a twisted W-shaped N3C2 core, monomeric [N{(CF3)C(C6F5)N}(2)]Ag-(CNtBu)(2) and [N{(C3F7)C(C6F5)N}(2)]Ag((CNBu)-Bu-t)(2) where the kappa(1)-bonded triazapentadienyl ligand bonding to the metal fragment via the central nitrogen atom, monomeric [N{(CF3)C(C6F5)N}(2)]Ag(PPh3)(2) and [N{(C3F7)C(C6F5)N}(2)]Ag(PPh3)(2) that feature kappa(1)-bonded triazapentadienyl ligand bonding to the metal fragment via one of the terminal nitrogen atoms, to that of the monomeric [N{(CF3)C(C6F5)N}(2)]Cu(CNtBu)(2) containing a kappa(2)-bonded triazapentadienyl ligand and a U-shaped NCNCN ligand backbone. The isocyanide adducts show relatively high nu(CN) values in the IR spectra.