Dinuclear double-helical cobalt complexes with two-armed terdentate ligands: Synthesis, structure and physical properties

Three ligands with flexible bis-terdentate coordination sites, di(2-pyridylcarbaldehyde)-6,6′-dicarboxylic acid hydrazone-2,2′-bipyridine (H2L1), di(2-acetylpyridyl)-6,6′-dicarboxylic acid hydrazone-2,2′-bipyridine (H2L2) and di(2-pyridylketone)-6,6′-dicarboxylic acid hydrazone-2,2′-bipyridine (H2L3) have been easily prepared. Dinuclear double-stranded helicates Co2(L1)2(ClO4)2(C2H5OH)2(H2O)2 (1), Co2(HL2)(L2)(ClO4)3(C2H5OH)2(H2O)2 (2) and Co2(HL3)(L3)(ClO4)3(H2O)4 (3) based on the ligands, H2L1–3, respectively, have been obtained via self-assembly, their structures were determined by FT-IR, Elemental Analysis, ESI-MS and X-ray diffraction method.

Graphical abstractDinuclear double-stranded helicates Co2(L1)2(ClO4)2(C2H5OH)2(H2O)2 (1), Co2(HL2)(L2)(ClO4)3(C2H5OH)2(H2O)2 (2) and Co2(HL3)(L3)(ClO4)3(H2O)4 (3) based on the ligands with flexible bis-terdentate coordination sites, H2L1–3, respectively, have been obtained via self-assembly, their structures were identified by FT-IR, Elemental Analysis, ESI-MS and X-ray diffraction method.Figure optionsDownload full-size imageDownload as PowerPoint slide