Synthesis, And Structural Characterization Of Di-and Tri-nuclear Ag(â… ) Complexes Containing Dipyridylpyrrole Tridentate Ligand

Dipyridylpyrrole tridentate ligand is a typical N/N/N planar ligand. Transition metal complexes containing dipyridylpyrrole ligand are limited in Zn, Cu, Ni, Co, Fe, Pd and Pt, while Ag(I) complexes have not been reported at present. In this paper, the syntheses and structural characterization of Ag(I) complexes containing dipyridylpyrrole ligand have been investigated.The contents include three parts as following:(1) The reaction of L1and AgOTf in the presence of Et3N afford a trinuclear Ag(I) complex [(L1)Ag]3(1). Complex1contains a triangular Ag3core. The two Ag atoms are linked by twisted L1ligand.(2) Tri-nuclear complex [Ag{(L1)Ag(PPh3)}2](OTf)(2) is obtained by addition of PPh3into the mixture of L1and AgOTf in the presence of Et3N, and di-nuclear complex Li2[(L1)Ag2{P(O)(OEt)2}2](OTf)(3) is obtained by addition of HOP(OEt)2into the mixture of L1and AgOTf in the presence of Li[N(SiMe3)2]. Complex2contains tri-silver atoms which are linear. The two terminal Ag atoms are three coordination, which is from PPh3phosphorous atom, one pyridyl and one pyrrolyl N atoms. The center Ag atom is only coordinated to residue pyridyl N atom of L1ligand. Complex3contains two silver atoms linked by twisted L1ligand.(3) Di-nuclear Ag(I) complex [(L2)Ag]2(OTf)2(4) is obtained by the reaction of L2with AgOTf. Complex4contains two silver atoms, and L2ligand coordinate to Ag atoms in a head-to-head fashion with only pyridine nitrogen coordinated, that means the pyrrole nitrogen is non-coordinated.