posted on 2015-12-17, 09:31authored byLei Wang, Qi Fang, Qing Lu, Shao-jun Zhang, Ying-ying Jin, Zhi-qiang Liu
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.