A new polymorph of 4′-tolyl-2,2′:6′,2′′-terpyridine (ttpy) and the single crystal structures of [Fe(ttpy)2][PF6]2 and [Ru(ttpy)2][PF6]2

Single crystals of a new polymorph of 4′-tolyl-2,2′:6′,2′′-terpyridine (ttpy) have been grown by evaporation of a hexane–ethyl acetate solution of the ligand; the packing features weak π-stacking and Npyridine···HC interactions between stacks of ttpy molecules. Improved syntheses of [M(ttpy)2][PF6]2 (M = Fe, Ru), and the single crystal structures of [Fe(ttpy)2][PF6]2 · 2.2MeCN and [Ru(ttpy)2][PF6]2 · 1.75MeCN · 0.2H2O are reported.