Lone pair-π interaction-induced generation of non-interpenetrated and photochromic cuboid 3-D naphthalene diimide coordination networks.
Interpenetration is an intrinsic behaviour for the porous coordination networks. To prevent the interpenetration, a common strategy is the imposition of geometric or steric restrictions by incorporating bulky moieties into organic tectons. So far, most of the available incorporations have been achieved through a covalent connection, while few involved in the non-covalent weak interactions. In this paper, we have reported that such interpenetration can be prevented by the less common lone pair-π interactions. By imposing the lone pair-π interactions through the addition of lone-pair-bearing N-methylpyrrolidin-2-one or iodine, combinations of rigid naphthalene diimide tectons bearing two divergently oriented pyridyl units at both imide extremities with ZnSiF6 led to non-interpenetrated cuboid 3-D coordination networks that should have been interpenetrated. In addition, such close-contacting lone pair-π interactions between electron donors and acceptors have also been demonstrated to play a key role in their photochromic properties.
State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, China350116. meijin_lin@fzu.edu.cn cchuang@fzu.edu.cn.
Jian-Jun
JJ
Liu
Yu-Jian
YJ
Hong
Ying-Fang
YF
Guan
Mei-Jin
MJ
Lin
Chang-Cang
CC
Huang
Wen-Xin
WX
Dai