A Photochromic Thienyl Containing Zinc-Organic Framework with Three-Fold Interpenetrating Arrangement Showing Reversible Switching Photoconducting Property

作者：Tan, Aidong; Zhang, Jie^*; Piao, Jinhua; Li, Jiayao; Fu, Zhiyong^*

来源：Journal of Inorganic and Organometallic Polymers and Materials, 2023, 33(5): 1298-1305.

DOI：10.1007/s10904-023-02570-7

• Thienyl containing zinc-organic framework
• Photo-responsive system
• Crystalline material
• Structure and property

Exploring novel photoconductance switch crystalline materials with color indication is of the utmost importance. Herein, we reported a photochromic and photoconductive zinc organic framework, [Zn-2(TDC)(2)(TPT)]center dot H2O, composed of electron-rich sulfur-containing compounds, 2,5-thiophenedicarboxylic acid (TDC), as electron donor, and electron-deficient 2,4,6-tri-(4-pyridyl)-s-triazine (TPT) as the electron acceptor, which exhibited an uncommon electron transfer pathway. Upon photo-stimuli and subsequently storing in dark, the crystalline materials show reversible color changes from pale-yellow to green accompanied by the conductance switching from 4.3 x 10(-9) to 1.9 x 10(-9) S cm(-1). The mechanism and electron transfer pathway of the stimuli-responsive materials have been explained by X-ray photoelectron spectroscopy (XPS), electron spin-resonance spectroscopy (ESR), and single X-ray diffraction data. Upon light exposure, the electron could hop from both thienyl-S/carboxyl-O to s-triazine-N. This work not only offers a new approach to the modification of visible photoconducting switch by the crystal engineering strategy but also sheds light on a new electron transfer system. (GRAPHICS)