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 .