博彩平台

Peng Huo,^a   Yan-Hong Li,^a   Li-Jun Xue,^a   Ting Chen,^a   Lei Yu,^a   Qin-Yu Zhu*^a（朱琴玉） and   Jie Dai*^a （戴洁）

^a College of Chemistry, Chemical Engineering and Materials Science, Soochow University

CrystEngComm, 2016,18, 1904-1910

A series of tetrathiafulvalene (electron donor, D) charge-transfer salts with three methyl bipyridiniums (electron acceptor, A) in the basic formulas MV(HL)₂ (1), MeBpe(HL)₂ (2) and MeBpa(HL)₂ (3) (L = dimethylthio-tetrathiafulvalene-bicarboxylate, MV = methyl viologen, MeBpe = 1,2-bi(4-pyridinium) ethene and MeBpa =1,2-bi(4-pyridinium) ethane) was synthesized and their structures were characterized by X-ray single crystal analysis. The three bipyridiniums allow the exploration of the effect of different conjugated systems on molecular packing and charge-transfer interactions. A type of –DDDD– stacking column with edge-to-edge short D⋯A⋯D contacts is found in MV compound 1, while in π-extended MeBpe compound 2, a –DADDAD– type of stacking column with face-to-face short D⋯D and A⋯D stacking is formed, which shows the most effective cation–anion interaction. No effective interaction is found for the non-conjugated MeBpa compound 3. The charge-transfer from an anion to a cation measured by UV-vis, CV and ESR is in the order of 2 > 1 ≫ 3, which is greatly in accordance with the order of the cation's conjugated state and CT interaction. It is known that charge-transfer is a key factor in obtaining photoelectric materials. Photocurrent responses of these compounds are consequently studied and the results agree with the intensity of charge-transfer. This is a systematic study of the effect of different π-conjugated systems on charge-transfer properties in terms of crystal structures.

链接： //pubs.rsc.org/en/content/articlelanding/2016/ce/c6ce00180g#