SERS application in elucidation of the nature of homologue Cu(I) triazenido complexes

Abstract

The reaction of the neutral 1,3-diphenyltriazenide derivative PhNHNNPh with [(PPh 3) 2Cu(CH 3COO)] 2 leads to a mixture of different coordinated Cu(I) complexes (TPPC), in contrast to the homologue complexes containing bidentate triazenido ligands, [(PPh 3)Cu(TolNNNTol)] 2 and [(PPh 3) 2Cu(XC 6H 4NNNC 6H 4Y)], X=Y=Et, X=H, Y=Me. The SERS spectrum of the reaction product reveals the strong enhancement of the ν(NN) mode, characteristic to the monodentate ligand, in contrast to the commonly enhanced band ν s(NNN) of the related studied complexes with bidentate triazenido ligands. The complete analysis of the SERS spectrum elucidates the nature of the mixed Cu(I) triazenido complexes in the reaction product and strongly suggests the presence of the main complex, with monodentate coordinated Cu(I), adsorbed on the Ag surface.