Ý -1,2,4,5-Tetrazine-N 1:N4-bis(pentaammineruthenium) tetracation: Synthesis and X-ray structure

The 2:1 reaction of [Ru(H2O)2(NH3)5]2+ with 1,2,4,5-tetrazine (tz) gives rise to the formation of the dinuclear complex ion [{Ru(NH3)5}2(ƒÝ-tz-N 1:N 4)]4+. Its tetraphenylborate and hexafluoro-phosphate salts have been fully characterized; the X-ray structure of the former has also been determined.