Crystal Structure of Bromo(2,2′:6′,2″-terpyridine)(2-(phenylazo)-pyridine)ruthenium(II) Tetrafluoroborate

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The title compound, C₂₆H₂₀N₆BrRu(BF₄), crystallizes in the centrosymmetric space group P2₁/n and consists of discrete complex units. The Ru(II) ion is octahedrally coordinated to one 2,2′:6′,2″-terpyridine (tpy), one 2-(phenylazo)pyridine (azpy) and a Br atom in trans-axial position at a distance of 2.547(5)Å. The shorter Ru-N (azo) distance (1.960(3)Å) than the Ru-N(py) distance (2.061(3)Å) signifies a strong π-backbonding, which leads to a longer, N=N (azo) bond (1.304(4)Å).