Crystal structure and magnetic study of the complex salt [RuCp(PTA)(2)–μ-CN-1κC:2κN–RuCp(PTA)(2)][Re(NO)Br(4)(EtOH)(0.5)(MeOH)(0.5)]

A new Ru(II)–Re(II) complex salt, μ-cyanido-κ(2) C:N-bis­[(η(5)-cyclo­penta­dien­yl)bis(3,5,7-tri­aza­phosphaadamantane-κP)ruthenium(II)] tetra­bromido­(ethanol/methanol-κO)nitrosylrhenate(II), [Ru(CN)(C(5)H(5))(2)(C(6)H(12)N(3)P)(4)][ReBr(4)(NO)(CH(4)O)(0.5)(C(2)H(6)O)(0.5)] or [RuCp(PTA)(2)–μ-CN–1κC:2κ(2) N-RuCp(PTA)(2)][Re(NO)Br(4)(EtOH)(0.5)(MeOH)(0.5)] (PTA = 3,5,7-tri­aza­phosphaadaman­tane) was obtained and characterized by single-crystal X-ray diffraction, elemental analysis and infrared spectroscopy. The title salt was obtained by liquid–liquid diffusion of methanol/DMSO solutions of (NBu(4))[Re(NO)Br(4)(EtOH)] and [(PTA)(2)CpRu–μ-CN–1κC:2κ(2) N-RuCp(PTA)(2)](CF(3)SO(3)). The Ru(II) and Re(II) independent moieties correspond to a binuclear and mononuclear complex ion, respectively. A deep geometrical parameter analysis was performed, and no significant differences were found with earlier reports containing similar mol­ecules. The magnetic properties were investigated in the temperature range 2.0–300 K, and the complex behaves as a quasi-magnetically isolated spin doublet with weak anti­ferromagnetic inter­actions.