title: Crystal structure of poly[(4-amino-pyridine-κN)(N,N-di-methyl-formamide-κO)(μ3-pyridine-3,5-di-carboxyl-ato-κ(3) N:O (3):O (5))copper(II)].
abstract: The title compound, [Cu(C7H3NO4)(C5H6N2)(C3H7NO] n , is an amino-function-alized chiral metal-organic framework with (10,3)-a topology. It has been constructed via the assembly of the achiral triconnected pyridine-3,5-di-carboxyl-ate (3,5-PDC) building block and a triconnected Cu(II) atom. Each Cu(II) ion is coordinated by two O atoms and one N atom, respectively, of three crystallographically independent 3,5-PDC ligands. The square-pyramidal (CuN2O3) coordination geometry of the Cu(II) ion is completed by an N atom of a terminal 4-amino-pyridine (4-APY) ligand and the O atom of a terminal N,N-di-methyl-formamide (DMF) ligand to give a triconnected 'T'-shaped secondary building unit, which becomes trigonal in the resulting (10,3)-a topology. In the three-dimensional structure, weak N-H⋯O hydrogen bonds are observed in which the donor N-H groups are provided by the 4-APY ligands and the acceptor O atoms are provided by the non-coordinating carboxylate O atoms of the 3,5-PDC ligands.
authors.affiliation: Institute of Inorganic Materials, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, People's Republic of China.
authors.forename: Cheng-Chen
authors.initials: CC
authors.lastname: Shen
authors.affiliation: Institute of Inorganic Materials, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, People's Republic of China.
authors.forename: Xiu-Ni
authors.initials: XN
authors.lastname: Hua
authors.affiliation: Institute of Inorganic Materials, School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Han
keywords: (10,3)-a topology; chiral network; crystal structure; metal–organic framework