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Fluorescent zinc complexes of 1,2-disubstituted benzimidazole (R1–R3) have been synthesized and characterized using single crystal X-ray diffraction. The ligands L1–3 were found to be less emissive due to photoinduced electron transfer (PET) mechanism originated from the electron pair of benzimidazole nitrogen. The complexation of ligands with Zn(II) not only enhances the fluorescent intensity; it also orients the ligands to a new packing. It was observed that the aromatic unit plays a decisive role in the packing of the molecules. The complex R1 has extended the coordination through C–H···π interaction, whereas complex R2 involved C–H···π interaction and C–H···Br interaction for packing in supramolecular architecture. Among these complexes, R3 showed the most interesting noncovalent interaction pattern involving C–H···π interaction, C–H···Br interaction, and π–π stacking between pyrene rings. These noncovalent interactions govern photophysical properties that are sensitive toward the microenvironment. Th...

crystal growth and design

ATP Induced Modulation in π–π Stacking Interactions in Pyrene Based Zinc Complexes: Chemosensor Study and Quantitative Investigation of Apyrase Activity