Figure 1.

Schematic representations of multidimensional assemblies formed by transition-metal complexes with controlled configurations that regulate the number of Hbim⁻¹ ligands. (A) “Zero-dimensional dimer” constructed by the complementary intermolecular hydrogen bonds between Hbim⁻¹ ligands in the metal complexes coordinated by only one Hbim⁻¹ ligand. (B) One-dimensional linear chain assembled by the metal complexes with trans-configuration coordinated by two Hbim⁻¹ ligands. (C) One-dimensional zigzag ribbon assembled by the metal complexes with at least two Hbim⁻¹ ligands in cis-configuration. (D) Two-dimensional honeycomb sheet linked by three intermolecular hydrogen bondings of the metal complexes with three Hbim⁻¹ ligands. The sheet is constructed by hydrogen bondings with alternate linkage between different optical isomers of Δ and λ types. (E) Helical chain assembled by intermolecular hydrogen bondings between the same optical isomers of Δ or λ containing at least two Hbim⁻¹ ligands. n = number of Hbim⁻¹ ligands coordinated to transition metal ions.