Monoclinic and Triclinic Concomitant Polymorphs of di-mu-Pyridazine-1κ(2)N:2κ(2)N'-bis[(Saccharinato)Silver(I)]

Abstract

Crystallization of the title compound, di-μ-pyridazine-1κ 2N:2κ 2N′-bis[(2,3-dihydro-3-oxobenzisosulfonazolato-κN) silver(I)], [Ag<inf>2</inf>(C<inf>7</inf>H<inf>4</inf>NO<inf>3</inf>S) <inf>2</inf>(C<inf>4</inf>H<inf>4</inf>N<inf>2</inf>)<inf>2</inf>], from acetonitrile yields both monoclinic, (I), and triclinic, (II), polymorphs. In both forms, the silver(I) ions have a slightly distorted trigonal AgN <inf>3</inf> coordination geometry and are doubly bridged by two neutral pyridazine (pydz) ligands, generating a centrosymmetric dimeric structure. The saccharinate (sac) ligands are N-coordinated. The dihedral angles between the sac and pydz rings are 8.43 (7) and 7.94 (8)° in (I) and (II), respectively, suggesting that the dimeric molecule is nearly flat. The bond geometry is similar in both polymorphs. In (I), the dimers interact with each other via aromatic π<inf>sac</inf>-π<inf>pydz</inf> stacking interactions, forming two-dimensional layers, which are further crosslinked by weak C - H⋯O interactions. Compound (II) exhibits similar C - H⋯O and π-π interactions, but additional C - H⋯π and π⋯Ag interactions help to stabilize the packing of the dimers. © 2006 International Union of Crystallography.