Abstract Three manganese coordination compounds, [Mn(Meophtpy)<inf>2</inf>]·2ClO<inf>4</inf>(Meophtpy = 4'-(4-methoxylphenyl)-2,2':6',2″-terpyridine) (I), [Mn(Ftpy)<inf>2</inf>](ClO<inf>4</inf>)<inf>2</inf>(Ftpy = 4'-(2-furyl)-2,2':6',2″-terpyridine) (II) and [Mn(m-ClPhtpy)<inf>2</inf>]·2ClO<inf>4</inf>(m-ClPhtpy = 4'-(3-chlorophenyl)-2,2':6',2″-terpyridine) (III), have been synthesized by hydrothermal methods and characterized by IR, elemental analysis, powder and single-crystal...