Enhanced Circularly Polarized Luminescence by a Homochiral Guest–Host Interaction in Gyroidal MOFs, [Ru(bpy)3] [M2(ox)3] (bpy = 2,2′-Bipyridyl, ox = Oxalate, M = Zn, Mn)

We report the circularly polarized luminescence (CPL) for [Ru­(bpy)3]­I2 (1) and [Ru­(bpy)3]­[M2(ox)3] (M = Zn (2), Mn (3)). Whereas compound 1 is a simple salt of [Ru­(bpy)3]2+, 2 and 3 are MOFs in which the chiral [Ru­(bpy)3]2+ ions are encapsulated in a homochiral gyroidal skeleton of [M2(ox)3]2–. Whereas the solution of 1 exhibited weak CPL with a luminescence dissymmetry factor of |glum| ∼ 10–4, the CPL was significantly enhanced in solid-state 1–3 with |glum| = 2 × 10–2 for 1, 4 × 10–2 for 2, and 1 × 10–1 for 3. The enhanced CPL in 3 was attributable to an energy transfer between the homochiral guest and host in 3.