Syntheses,Structures and Luminescent Properties of Metal Halide Complexes Containing 2,3‐Diphenylquinoxaline

The reaction of CuI with 2,3‐diphenylquinoxaline ( L ) in 1:1 mole proportion in CH₃CN/THF afforded the dinuclear complex CuI( L )]₂, 1 , whereas the reactions of MX₂ (M = Cu; Hg) with L in 1:2 mole proportion in CH₃OH gave the mononuclear complexes CuX₂( L )₂ (X = Cl, 2 ; Br, 3 ) and HgX₂( L )₂ (X = Cl, 4 ; Br, 5 ). Formulations of all the complexes were determined on the basis of X‐ray crystallography, elemental, IR‐ and emission spectroscopy. X‐ray examination revealed that complex 1 forms the μ,μ‐iodobridged dimer with distorted trigonal planar geometry through coordination of L ligand by one nitrogen atom to the Cu(I) center. The metal centers of complexes 2 and 3 form distorted square planar geometry while those of complexes 4 and 5 form linear geometry. The molecules of these complexes are interlinked through C‐H—π and/or π‐π stacking and anion—π interactions that form the packed structure. All the complexes exhibit emissions which may be tentatively assigned as intraligand (IL) π r? π* transitions.