title: A novel [4 + 3] interpenetrated net containing 7-fold interlocking pseudo-helical chains and exceptional catenane-like motifs.
abstract: A novel interpenetrating metal-organic framework, namely [Zn(3)L(2)(oba)(3)(H(2)O)(2)]·(4)H(2)O (1), has been synthesized under hydrothermal conditions. Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, IR, and thermogravimetric (TG) analysis. In the structure of 1, the rigid and flexible V-shaped ligands link Zn(ii) to form a 3D structure where two types of helices and four types of pseudo-helical chains containing three pairs of enantiomers and two pairs of conformational isomers have been characterized. One such 3D framework incorporates six identical networks to form a 7-fold interpenetrated 3D framework. From the topological analysis, the Zn(ii) ions act as three- and four-connected nodes, and oba as well as L are linkers. The framework of compound can be classified as a new (6(3))2(6(5)·8) topology, which is a novel (3,3,4)-connected [4 + 3] 7-fold interpenetrating net showing 7-fold interlocking pseudo-helical chains and a unique catenane-like motif with Hopf links. In addition, the luminescence properties of the compound are discussed.
authors.affiliation: Institute of Functional Material Chemistry, Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, Jilin, China. qinc703@nenu.edu.cn zmsu@nenu.edu.cn.
authors.forename: Bai-Qiao
authors.initials: BQ
authors.lastname: Song
authors.forename: Chao
authors.initials: C
authors.lastname: Qin
authors.forename: Yu-Teng
authors.initials: YT
authors.lastname: Zhang
authors.forename: Li-Tao
authors.initials: LT
authors.lastname: An
authors.forename: Kui-Zhan
authors.initials: KZ
authors.lastname: Shao
authors.forename: Zhong-Min
authors.initials: ZM
authors.lastname: Su