Effect of co-ordination mode on the physical properties of pyrazinyltriazole ligands bound to bis(2,2′-bipyridyl)ruthenium(II)

doi:10.1039/DT9910003271

Paper

Effect of co-ordination mode on the physical properties of pyrazinyltriazole ligands bound to bis(2,2′-bipyridyl)ruthenium(II)

Published 1991 · R. Hage, J. Haasnoot, H. Nieuwenhuis

Journal of The Chemical Society-dalton Transactions

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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.

Study Snapshot

Key takeawayThe co-ordination mode of pyrazinyltriazole ligands on bis(2,2′-bipyridyl)ruthenium(II) affects the physical properties of the complex, with the N2 site being a stronger donor than the N4 atom.

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Effect of co-ordination mode on the physical properties of pyrazinyltriazole ligands bound to bis(2,2′-bipyridyl)ruthenium(II)

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