The effects of crystal structure on optical absorption/photoluminescence of bis(8-hydroxyquinoline)zinc

In this paper, the trans formal ion processes of two types of bis(8-hydroxyquinoline)zinc: Znq(2) dihydrate and anhydrous (Znq2)4 were investigated by X-ray diffraction (XRD), infrared spectra (IR), scanning electron microscope (SEM), differential scanning calorimetry (DSC) and thermogravimetry (TG). The effects of crystal structure on optical properties of bis(8-hydroxyquinoiline)zinc were analyzed. Znq(2) dihydrate can be transformed into anhydrous (Znq(2))(4) during heating under vacuum. Reversal transformation occurs by the interaction between chloroform and (Znq(2))(4). But (Znq(2))(4) was partially transformed into Znq(2) dihydrate by the interaction between ethanol and (Znq(2))(4). The different molecular structure results in different crystal stacking and electronic structure, thereby affect its optical properties. (C) 2005 Elsevier Ltd. All rights reserved.