Author(s)

Xueqing Hou, Jing Ling, Navamoney Arulsamy, Jianqiang Huo

Department of Chemistry, University of Wyoming, Laramie, USA.
Key Laboratory of Eco-Environment Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, China.

Two piezochromic fluorescent compounds are prepared by introducing thiomethyl substituents to the peripheralpositions of two related cyano oligo(p-phenylene vinylenes) (CN-OPV). The new derivatives, namely, 1,4-bis[2-cyano-2(4-thiomethylphenyl)ethenyl]benzene (TOPV1) and 1,4-bis(1-cyano-2-(4-thiomethylphenyl)ethenyl) benzene (TOPV2), are characterized by NMR, powder X-ray diffraction data (XRD) and differential scanning calorimetric (DSC) data. UV-Vis and fluorescence spectra are also measured. TOPV1 with the cyano groups farther away from the central aromatic ring is photoluminescent, and on application of pressure exhibits a more obvious color change and higher Stokes shift than those measured for TOPV2. We also observe piezochromic aggregation-induced emission (PAIE) for TOPV2, but TOPV1 does not exhibit any PAIE.

Aggregation Induced Emission (AIE); Piezochromic Fluorophore; Excimer Fluorescence

X. Hou, J. Ling, N. Arulsamy and J. Huo, "Thiomethyl Derivatives of Two Oligo(p-phenylene vinylenes) as New Aggregation-Induced Piezofluorochromic Emitters," Materials Sciences and Applications, Vol. 4 No. 6, 2013, pp. 331-336. doi: 10.4236/msa.2013.46043.