Synthesis, spectroscopic, crystal structure, thermal and optical studies of a novel proton transfer complex: 2-Methyl-8-hydroxyquinoliniumpicrate

Abstract

A novel proton transfer complex, 2-methyl-8-hydroxyquinoliniumpicrate (MHQP), has been synthesized in methanol solvent using 2-methyl-8-hydroxyquinoline (MHQ) as proton acceptor and picric acid (PA) as proton donor in 1:1 M ratio, and its single crystal growth, thermal, spectroscopic, optical properties along with atomic packing of crystal have been studied. The DSC and TGA infer the thermal behavior of complex and FT-IR and proton NMR spectroscopic studies infer the charge-transfer interaction via transfer of proton. The powder XRD indicates novelty of the complex and single crystal analysis of MHQP crystal confirms the ionic interaction along with H-bonding interactions between MHQ and PA. The association constant and molar extinction coefficients were studied based on higher absorption band in UV–vis. absorption spectrum of the complex. The significant optical transmittance spectrum of grown MHQP crystal is indicative for its possible applications in opto-electronic devices.