Green emission band associated with defects in the crystal growth of a new chiral imine

The morphological, structural and optical properties of a new chiral imine, namely (S)-(+)-[(1-phenyl)-N-(1-benzo [b]tiofen-2-yl)methylidene]ethylamine (Bt), are reported. Photoluminescence showed a band of intense green emission located at ∼525 nm. The absorbance spectra displayed bands associated with π→π* and n→π* electronic transitions. The band gap was quantified by two electronic transitions at ∼3.5 and ∼4.7 eV, confirming those observed by absorbance. XRD studies showed a monoclinic phase. Additionally, by using Time Depending-Density Functional Theory (TD-DFT), the electronic and optical properties were examined.