title: Chiral Ni(II) coordination polymers: structure-driven effects of temperature and polyvinylpyrrolidone.
abstract: Chiral Ni(II) coordination compounds with structures of [NiL(H(2)O)(3)] (1) and {[NiL(H(2)O)]·0.5H(2)O}(n) (2) (H(2)L = thiazolidine 2,4-dicaboxlic acid) have been successfully synthesized by the reaction of Ni(CH(3)COO)(2)·4H(2)O and H(2)L in aqueous solution at 25 and 80 °C, respectively. From the same procedure with polyvinylpyrrolidone (PVP) as a surfactant, another corresponding micrometer-scale Ni(II) coordination polymer, {[NiL(H(2)O)(2)]·H(2)O}(n) (3), has been obtained at both 25 and 80 °C, which shows a different structure (one-dimensional, 1D) than both 1 (discrete molecule) and 2 (3D). The conversions of structures and conformations are directed by temperature and surfactant (PVP), as confirmed by powder and single-crystal X-ray diffraction. Circular Dichroism (CD) and Second Harmonic Generation (SHG) measurements of the products have been investigated as well, which indicate the potential applications of these products in chiral and nonlinear optical (NLO) areas.
authors.affiliation: Department of Chemistry and Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, China.
authors.forename: Yan-Yan
authors.initials: YY
authors.lastname: Yin
authors.forename: Jian-Gong
authors.initials: JG
authors.lastname: Ma
authors.forename: Zheng
authors.initials: Z
authors.lastname: Niu
authors.forename: Xiao-Chang
authors.initials: XC
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Peng
authors.initials: P
authors.lastname: Cheng
mesh_terms: D008863:Microspheres; D008958:Models, Molecular; D008968:Molecular Conformation; D009532:Nickel / Q000737:chemistry*; D055620:Optical Phenomena; D011205:Povidone / Q000737:chemistry*; D013237:Stereoisomerism; D013696:Temperature
chemical_list: D009532:Nickel; D011205:Povidone