Structural,PhotoluminescentandTheoreticalEvidenceforLigand-unsupportedArgentophilicInteractionsinaSupramolecularAggregateof[Ag2（Hida）(NH3)2]

A new neutral [Ag2(Hida)(NH3)2] molecule (1, H3ida = 1H-imidazole-4,5-dicarboxy- lic acid) has been synthesized and structurally characterized by single-crystal diffraction. Compound 1 crystallizes in monoclinic, space group C2/c with a = 18.3928(8), b = 8.3299(5), c = 13.682(7) , β = 113.179(2)o, V = 1926.9(10)3, Z = 8 and Dc = 2.784 g·cm-3. In the solid state, this disilver(I) compound can aggregate to furnish the energetically stable ligand-unsupported AgI–AgI interaction concomitant with significant photoluminescence changes in different aggregate states, and such argentophilicity interaction is also supported by molecular orbital calculations.