title: One- and two-dimensional Cd(II) coordination polymers constructed from 2-(2-methyl-1H-benzimidazol-1-yl)acetate ligands.
abstract: The one- and two-dimensional polymorphic cadmium polycarboxylate coordination polymers, catena-poly[bis[μ2-2-(2-methyl-1H-benzimidazol-1-yl)acetato-κ(3)N(3):O,O']cadmium(II)], [Cd(C10H9N2O2)2]n, and poly[bis[μ2-2-(2-methyl-1H-benzimidazol-1-yl)acetato-κ(3)N(3):O,O']cadmium(II)], also [Cd(C10H9N2O2)2]n, were prepared under solvothermal conditions. In each structure, each Cd(II) atom is coordinated by four O atoms and two N atoms from four different ligands. In the former structure, two crystallographically independent Cd(II) atoms are located on twofold symmetry axes and doubly bridged in a μ2-N:O,O'-mode by the ligands into correspondingly independent chains that run in the [100] and [010] directions. Chains containing crystallographically related Cd(II) atoms are linked into sheets via π-π stacking interactions. Sheets containing one of the distinct types of Cd(II) atom are stacked perpendicular to [001] and alternate with sheets containing the other type of Cd(II) atom. The second complex is a two-dimensional homometallic Cd(II) (4,4) net structure in which each Cd(II) atom is singly bridged to four neighbouring Cd(II) atoms by four ligands also acting in a μ2-N:O,O'-mode. A square-grid network results and the three-dimensional supramolecular framework is completed by π-π stacking interactions between the aromatic ring systems.
authors.affiliation: College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.affiliation: College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.
authors.forename: Hui-Ting
authors.initials: HT
authors.lastname: Wang
authors.affiliation: College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Ye
keywords: benzimidazole; cadmium; crystal engineering; crystal structure; hydrothermal synthesis; one-dimensional coordination polymer; square-grid sheets; two-dimensional coordination polymer; π–π stacking interactions