title: The impact of lone pair-π interactions on photochromic properties in 1-D naphthalene diimide coordination networks.
abstract: Lone pair-π interaction is an important but less studied binding force. Generally, it is too weak to influence the physical properties of supramolecular systems. Herein we reported the first example exhibiting the impact of lone pair-π interactions on photochromic properties of naphthalene diimide based coordination networks. In three isostructural 1-D networks, [(DPNDI)ZnX2] (DPNDI = N,N-di(4-pyridyl)-1,4,5,8-naphthalene diimide, X = Cl for 1, X = Br for 2 and X = I for 3), they exhibit different electron-transfer photochromic behaviors due to different lone pair-π interactions between the capped halogen atoms and electron-deficient DPNDI moieties. Specifically, 1 and 2 but not 3 are photochromic, which is attributed to a stronger lone pair-π interaction in 3 than those in 1 and 2. This study anticipates breaking a new path for designing novel photochromic materials through such unnoticeable supramolecular interactions.
authors.affiliation: State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, China350116. meijin_lin@fzu.edu.cn cchuang@fzu.edu.cn.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Liu
authors.forename: Ying-Fang
authors.initials: YF
authors.lastname: Guan
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.forename: Mei-Jin
authors.initials: MJ
authors.lastname: Lin
authors.forename: Chang-Cang
authors.initials: CC
authors.lastname: Huang
authors.forename: Wen-Xin
authors.initials: WX
authors.lastname: Dai