title: Diruthenium(III,III) diphosphonate with a spin ground state S = 2.
abstract: Complexes containing a Ru(2)(n+) core (n = 4, 5 or 6) have been of great interest because of their variety of electronic configurations and magnetic properties. Herein, we report a novel homovalent Ru(2)(6+)-based complex, (H(2)pip)(2)[Ru(2)(hedp)(2)Cl(2)]·6H(2)O (pip = piperazine) (1), isolated by the direct reaction of the mixed-valent Ru(2)(5+)-based anion Ru(2)(hedp)(2)(3-) [hedp = 1-hydroxyethylidenediphosphonate, CH(3)C(OH)(PO(3))(2)] with oxidant peracetic acid under room temperature conditions. Magnetic measurements unambiguously confirm that this complex contains four unpaired electrons with a spin ground state of S = 2.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, P. R. China. liubin@nwu.edu.cn
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.forename: Tuo
authors.initials: T
authors.lastname: Ding
authors.forename: Wei-Jie
authors.initials: WJ
authors.lastname: Hua
authors.forename: Xue-Mei
authors.initials: XM
authors.lastname: Liu
authors.forename: Huai-Ming
authors.initials: HM
authors.lastname: Hu
authors.forename: Shu-Hua
authors.initials: SH
authors.lastname: Li
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Zheng