Taming 2,2'-biimidazole ligands in trivalent chromium complexes.

ABSTRACT: Complete or partial replacement of well-known five-membered chelating 2,2'-bipyridine (bipy) or 1,10-phenanthroline (phen) ligands with analogous didentate 2,2'-biimidazole (H₂biim) provides novel perspectives for exploiting the latter pH-tuneable bridging unit for connecting inert trivalent chromium with cationic partners. The most simple homoleptic complex [Cr(H₂biim)₃]³⁺ and its stepwise deprotonated analogues are only poorly soluble in most solvents and their characterization is limited to some solid-state structures, in which the pseudo-octahedral [CrN₆] units are found to be intermolecularly connected via peripheral N-H⋯X hydrogen bonds. Moreover, the associated high-energy stretching N-H vibrations drastically quench the

SUBMITTER: Chong J 

PROVIDER: S-EPMC11443315 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature