Optical spectrum of hexaaquoruthenium(III) ion and its conjugate base

Zvi Harzion, Gil Navon

Research output: Contribution to journalArticlepeer-review


The spectrum of Ru(H2O)63+ was measured and fitted to the Tanabe and Sugano matrices. The parameters obtained, Dq = 2860 ± 40 cm-1 and B = 640 ± 40 cm-1 assuming C/B = 4, were compared with a systematic survey of analogous ruthenium(III) and rhodium(III) complexes. The pK for the formation of Ru(H2O)5OH2+ was found to be 2.4 ± 0.2 at 20°C and I = 1.0 M by a spectrophotometric titration. The charge-transfer bands of Ru(H2O)63+ and Ru(H2O)5OH2+ were interpreted in terms of the optical electronegativities of H2O and OH-1.

Original languageEnglish
Pages (from-to)2236-2239
Number of pages4
JournalInorganic Chemistry
Issue number8
StatePublished - 1980


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