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Graf, Marion; Mayer, Peter; Böttcher, Hans-Christian (2017): Synthesis and crystal structure of a homoleptic diruthenium complex containing tetra-2-pyridyl-1,4-pyrazine (tppz). In: Zeitschrift für Naturforschung Section B-A Journal of Chemical Sciences, Vol. 72, Nr. 10: S. 759-762
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Treatment of hydrated ruthenium(III) chloride with tetra-2-pyridyl-1,4-pyrazine (tppz) in refluxing ethoxyethanol afforded the homoleptic dinuclear complex [(tppz) Ru(mu-tppz) Ru(tppz)](4+) (1) besides small amounts of the species [ Ru(tppz)(2)](2+). The title complex 1 was obtained as purple crystals and characterized as its hexafluoridophosphate salt by NMR spectroscopy, mass spectrometry and microanalyses. The molecular structure of 1(PF6)(4) has been established by X-ray crystallography.