Isolation of bis(1,4-diphenyl-1,4-bis(2-pyridyl)-2,3-diaza- 1,3-butadiene)disilver with bridging (N-N) dinucleating subunits: formation of a 6-membered chelate ring

A novel Ag(I) dinuclear complex {[(C_6H_5)(C_5H_4 N)-C=N-N=C-(C_5H_4 N)(C_6H_5)]Ag}2 .ClO_4 (ClO_4) (1/2CH_3CN) (1) that was derived under mild conditions, during the course of combination of AgCl_O4 with a polymorphic azine ligand, 1,4-diphenyl-1,4-bis(2-pyridyl)-2,3-diaza-1,3-butadiene (L) (condensed product of phenyl 2-pyridyl ketone and hydrazine monohydrate) is reported. The aforementioned complex is based on a central rotationally flexible diazine subunit (N-N). The azine ligand, L, having the N_2 dinucleating fragment, provides a coordination focus for pairs of metal centres and ultimately leads to the formation of a 6-membered chelate ring in 1.