SCHEDULED MAINTENANCE
Effect of co-ordination mode on the physical properties of pyrazinyltriazole ligands bound to bis(2,2′-bipyridyl)ruthenium(II)
Abstract
The physical properties of the two co-ordination isomers of the bis(2,2′-bipyridyl)ruthenium(II) complex of 3-(pyrazin-2-yl)-1,2,4-triazole have been studied. In particular the acid–base properties have been analysed with respect to the nature of the ligand and the co-ordination mode of the triazole ring. The ground-state pKa(acid) values of 3.1 and 5.3 obtained for the N2 and N4 isomers respectively indicate that the N2 site of the triazole ring is a stronger σ donor than is the N4 atom. The excited-state pKa values obtained for deprotonation of the triazole ring are unusual and support earlier suggestions that in the compounds containing the neutral pyrazinyltriazole ligands the lowest π* level is based on the pyrazinyltriazole ligand, while for the deprotonated ligands this level is 2,2′-bipyridine based.
Please wait while we load your content...
