title: Octupolar (C3 and S4) Symmetric Cyclized Indole Derivatives: Syntheses, Structures, and NLO Properties.
abstract: Several cyclized indole derivatives have been synthesized, and their structures been determined. The C3-symmetric single-chiral N-phenyltriindole (Tr-Ph3) crystallized in the P1 space group, and the S4-symmetric saddle-like tetraindole (TTr) crystallized in the I4̅ space group. The Tr-Ph3 and TTr crystals exhibit remarkable powder SHG intensities 5 and 11 times that of KH2PO4 (KDP), respectively. TTr is a useful octupolar core to build S4-symmetric molecules and crystals for second-NLO materials.
authors: School of Chemistry and Chemical Engineering, Shandong University , 250100 Jinan, P. R. China.
authors: Lei
authors: L
authors: Wang
authors: School of Chemistry and Chemical Engineering, Shandong University , 250100 Jinan, P. R. China.|State Key Laboratory of Crystal Materials, Shandong University , 250100 Jinan, P. R. China.
authors: Qi
authors: Q
authors: Fang
authors: State Key Laboratory of Crystal Materials, Shandong University , 250100 Jinan, P. R. China.
authors: Qing
authors: Q
authors: Lu
authors: State Key Laboratory of Crystal Materials, Shandong University , 250100 Jinan, P. R. China.
authors: Shao-jun
authors: SJ
authors: Zhang
authors: State Key Laboratory of Crystal Materials, Shandong University , 250100 Jinan, P. R. China.
authors: Ying-ying
authors: YY
authors: Jin
authors: State Key Laboratory of Crystal Materials, Shandong University , 250100 Jinan, P. R. China.
authors: Zhi-qiang
authors: ZQ
authors: Liu