| Abstrakt: |
Trinuclear Co(III) complex [CoIII3(tpa)3(L)](BF4)4 (tpa: tris(2-pyridylmethyl)amine, H6L: 2,3,6,7,10,11-hexahydroxytriphenylene) is prepared from methanol solution. Single-crystal structure analysis revealed that the valency of the three cobalt ions is +3 and that the tris(dioxolene) bridging ligand is formally in the -5 [cat,cat,sq] oxidation state. This complex is stable in the entire temperature range investigated. Various-temperature magnetic susceptibility data for the compound displayed little variation in the range 2-300 K, and the reason caused the distinct charge distribution on Co-L (L: bridging ligand) by the natural rigidity of the tripodal ligands. Also, its CH3CN solution exhibits a very strong NIR absorption arising from an internal ligand transition within the triphenylene ligand. Cyclic voltammetry (CV) measurements in CH3CN solution show three reversible cat-sq redox waves for the triphenylene ligand. [ABSTRACT FROM AUTHOR] |
