title: L- and D-[LnZn(IN)3(C2H4O2)]n (Ln = Eu, Sm, and Gd): Chiral Enantiomerically 3D 3d-4f Coordination Polymers Constructed by Interesting Butterfly-like Building Units and -[Ln-O-Zn]n- Helices.
abstract: A total of six three-dimensional chiral coordination compounds L- and D-[LnZn(IN)3(C2H4O2)]n (Ln = Eu, Sm, and Gd; HIN = isonicotinic acid) have been successfully synthesized under hydrothermal conditions without any chiral auxiliary and characterized by IR, TG, elemental analyses, and solid-state circular dichroism spectra. The structures of 1-6 were determined by single-crystal X-ray structural analysis, which shows that L-[LnZn(IN)3(C2H4O2)]n (Ln = Eu (1), Sm (2), and Gd (3)) crystallize in space group P6522 and are levogyrate. The chiral frameworks of L-[LnZn(IN)3(C2H4O2)]n are constructed from L-helical Ln-O-Zn cluster chains, while adjacent L-type helical -[Ln-O-Zn]n- chains are connected through IN(-) ligands. D-[LnZn(IN)3(C2H4O2)]n (Ln = Eu (4), Sm (5), and Gd (6)) crystallize in space group P6122, and their chiral frameworks consist of D-helical Ln-O-Zn cluster chains. The observed second-harmonic generation efficiencies of [EuZn(IN)3(C2H4O2)]n, [SmZn(IN)3(C2H4O2)]n, and [GdZn(IN)3(C2H4O2)]n are 0.4, 0.3, and 0.3 times that of urea, respectively. We also studied luminescence spectra and luminescence lifetimes of 1 and 2. The luminescence lifetimes of 1 and 2 are 1.18 ms, and 29.6 μs, respectively.
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.
authors.forename: Xingxiang
authors.initials: X
authors.lastname: He
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Lv
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.
authors.forename: Yayu
authors.initials: Y
authors.lastname: Dong
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.
authors.forename: Gonghao
authors.initials: G
authors.lastname: Hu
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Zhou
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology , Nanjing 210009, P. R. China.|Coordination Chemistry Institute, State Key Laboratory of Coordination Chemistry, Nanjing University , Nanjing 210093, P. R. China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu