Synthesis and characterization of iminothiazole bearing polyphenol with adjustable white-yellow photoluminescence color

A new kind of thiazole based Schiff base, 2-[(benzothiazol-2-ylimino)methyl]phenol (2HBABT), was synthesized and then converted to its oligomer structure (O-2HBABT). Structural characterizations were made by Fourier transform infrared (FT-IR), nuclear magnetic resonance (NMR), size exclusion chromatography (SEC), and scanning electron microscopy (SEM) techniques. Optical properties were investigated by UV-vis and fluorescence analyses. Optical band gaps (E-g) were determined by absorption edges. Photoluminescence (PL) properties were determined in solution forms. Changes in PL characteristics in different solvents and applied excitation wavelengths were examined. O-2HBABT showed white and yellow emission colors in DMF by changing of applied excitation wavelength. Solid state electrical conductivities were measured by four-point probe technique. Cyclic voltammetry (CV) measurements were carried out and HOMO-LUMO energy levels and electrochemical band gaps (E ' g) were calculated. Thermal data were obtained by TG-DTA and DSC techniques. (c) 2012 Elsevier B.V. All rights reserved.