Enhanced Circularly Polarized Luminescence by a Homochiral Guest–Host Interaction in Gyroidal MOFs, [Ru(bpy)<sub>3</sub>] [M<sub>2</sub>(ox)<sub>3</sub>] (bpy = 2,2′-Bipyridyl, ox = Oxalate, M = Zn, Mn)
Kazuya Nakashima, Rie Suizu, Shuhei Morishita, Noriaki Tsurumachi, Masahiro Funahashi, Hyuma Masu, Ryuki Ozawa, Kazuki Nakamura, Kunio Awaga
Abstract
High Resolution Image Download MS PowerPoint Slide 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 .