title: Homochiral 1D zinc-quitenine coordination polymer with a high dielectric constant.
abstract: Heat treatment of a solution of MeOH and water containing the quitenine ligand HQA [HQA = 6-methoxyl-(8S,9R)-cinchonan-9-ol-3-carboxylic acid] and ZnCl2 at 70 degrees C to give the one-dimensional (1D) chain coordination polymer {(HQA)(ZnCl2)(2.5H2O)}n (1). The local coordination geometry around the zinc center in 1 displays a slightly distorted tetrahedron, with the HQA ligand adopting a zwitterionic moiety similar to that found in natural amino acids. Measurements on a powdered sample of 1 reveal a strong second-harmonic-generation response of ca. 20 times larger than that for KDP (KH2PO4). Notably, measurements on the dielectric properties of 1 showed that the 1D chain coordination polymer exhibited a dipolar chain relaxation process and a high dielectric constant (epsilon0= 37.3).
authors.affiliation: Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Yun-Zhi
authors.initials: YZ
authors.lastname: Tang
authors.forename: Xue-Feng
authors.initials: XF
authors.lastname: Huang
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Song
authors.forename: Philip Wai
authors.initials: PW
authors.lastname: Hong Chan
authors.forename: Ren-Gen
authors.initials: RG
authors.lastname: Xiong