title: Syntheses and crystal structures of benzohexathia[7]helicene and naphthalene cored double helicene.
abstract: Bis(trimethylsilyl)benzohexathia[7]helicene 1, naphthalene cored double helicene 2 (the fused dimer of 1), and a novel ten-membered cyclic diketone with four moieties of dithieno[2,3-b:3',2'-d]thiophene (3) were efficiently synthesized. Their crystal structures were determined with single-crystal X-ray analysis. In their crystal packings, they all show multiple short contacts including intermolecular pi...pi, pi...S, and S...S interactions. UV/vis spectra indicate that significant pi-electron delocalization existed in 1, 2, and 3.
authors.affiliation: Key Lab for Special Functional Materials of Ministry of Education, Henan University, Kaifeng, 475004, China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Wang
authors.forename: Jianwu
authors.initials: J
authors.lastname: Shi
authors.forename: Jiange
authors.initials: J
authors.lastname: Wang
authors.forename: Chunli
authors.initials: C
authors.lastname: Li
authors.forename: Xinyong
authors.initials: X
authors.lastname: Tian
authors.forename: Yanxiang
authors.initials: Y
authors.lastname: Cheng
authors.forename: Hua
authors.initials: H
authors.lastname: Wang