Luminescent [fac-Re(CO) < inf > 3 < /inf > -N∩O-phenylimidazole]complexes with parallel arrangement of twisted ligand motifs

Abstract

Luminescent complexes [fac-Re(CO)3(Y∩X)(ph-imz)]where (Y∩XH)= H2-PBI = 2-(2′-hydroxyphenyl)-1H-benzimidazole, H-PB0 = 2-(2′-hydroxyphenyl)benzoxazole for 2, and H-PBT = 2-(2′-hydroxyphenyl)benzothiazole for 3 and ph-imz = 2-phenylimidazole)were synthesized using Re2(CO)10, H2-PBI/H-PBO/H-PBT and ph-imz via one-pot approach. All the three complexes were characterized using FT-IR, 1H NMR, and single crystal X-ray diffraction analysis. The two coordinated, twisted ligand motifs are arranged closely parallel to each other and interacts through π⋅⋅⋅π stacking interactions in the solid state. The photophysical properties of the complexes were studied. All the complexes display moderate to strong emission both in the solution and solid state at room temperature.