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

We report the circularly polarized luminescence (CPL) for [Ru(bpy)(3)]I(2) (1) and [Ru(bpy)(3)][M(2)(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 [M(2)(ox)(3)](2-). Whereas the solution of 1 exhibited weak CPL with a luminescence dissymmetry factor of |g(lum)| ∼ 10(-4), the CPL was significantly enhanced in solid-state 1-3 with |g(lum)| = 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.