A photoluminescent dinuclear silver(I) complex exhibits CH···Ag close interactions and a new coordination mode of the pyridine-2,3-dicarboxylate

In this study, a novel dinuclear Ag(I)-pyridine-2,3-dicarboxylate complex with 1,3-diaminopropane ligand (pda), [Ag2(μ-2,3-pydc)2(Hpda)2]⋅2H2O (H22,3-pydc = pyridine-2,3-dicarboxylic acid), has been synthesized. The molecular structure of complex has been determined by the single crystal X-ray diffraction. The complex has been observed to crystallize in the triclinic space group P-1. The Ag(I) ion exhibits a distorted trigonal pyramidal geometry by two 2,3-pydc and one protonated monodentate Hpda ligands. The 2,3-pydc ligand acts as a tridentate bridging ligand with a new coordination mode between two Ag(I) centers through the pyridine N and carboxyl μ-O atoms, forming a 4-membered parallelogram Ag2O2 ring. The most striking feature is that the structure contains both intra- and inter-molecular CH···Ag hydrogen bonding interactions to form infinite 1D chains containing R22(8) rings.

In this study, a novel dinuclear Ag(I)-pyridine-2,3-dicarboxylate complex with 1,3-diaminopropane ligand (pen), [Ag2(μ-2,3-pydc)2(Hpda)2]⋅2H2O (H22,3-pydc = pyridine-2,3-dicarboxylic acid), has been synthesized. At this complex, both intra-molecular anagostic and inter-molecular multicenter hetero-acceptor hydrogen bond (IMH) MHC interactions are determined with X-ray crystallography techniques.Figure optionsDownload as PowerPoint slideHighlights
► The pydc ligand acts as a tridentate bridging ligand with a new coordination mode between two Ag(I) centers through the pyridine N and carboxyl μ-O atoms, forming a 4-membered parallelogram Ag2O2 ring.
► For this complex, both intra-molecular anagostic and inter-molecular multicentre hetero-acceptor hydrogen bond (IMH) M–H–C interactions are determined by using X-rays crystallography techniques.
► The complex exhibits red photoluminescence in the solid state at room temperature with emission maximum at 483 nm upon excitation at 310 nm.