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The title compound, [(S)-2-(anilinomethyl)pyrrolidine-N, N']-chloro(eta(6)-para-cymene)ruthenium(II) chloride, [RuCl-(C(10)H(14))(C(11)H(16)N(2))]Cl, has been synthesized by the reaction of [RuCl(2)(p-cymene)](2) (p-cymene is para-isopropyltoluene) with (S)-2-(anilinomethyl)pyrrolidine in triethylamine/2-propanol. The Ru atom is in a pseudo-tetrahedral environment coordinated by a chloride ligand, the aromatic hydrocarbon is linked in a eta(6) manner and the amine is linked via its two N atoms. The chloride anion is involved in hydrogen bonding with the diamine moieties through N-H.Cl interactions, with N.Cl distances of 3.273 (4) and 3.352 (4) A.

The novel title ruthenium(II) complex, [RuCl(C10H14)(C10H10N3OS)], was synthesized from the reaction of 1,2,4‐triazepine, a new class of bidentate ligands, with [Ru(p‐cymene)Cl2]2. The 1,2,4‐triazepine ligand is coordinated to the metal centre through the N‐4 and S atoms, forming a four‐membered chelate ring. This is the first structural example of a transition metal complex containing a 1,2,4‐triazepine ligand.

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