Ruthenium(II) tris(2,2’-bipyridine) Encapsulated within a novel Cobalt Metal Organic Framework Exhibits Guest to Host Photoinduced Electron Transfer

Christopher McKeithan, Lukasz Wojtas, Randy W. Larsen

4202 E Fowler Ave, Tampa, FL 33620

Here the photophysical properties of [Ru(2,2’-bipyridine)₃]²⁺ (RuBpy) encapsulated within a previously reported framework, RWLC-2, containing a substituted secondary building unit (SBU) composed of cobalt carboxylate clusters, herein, (RWLC-2 (Co)), are reported. The RWLC-2 (Co) exhibits photophysical properties that are unique relative to the parent RWLC-2. Deconvolution of the emission decay data reveals two kinetic phases one attributed to laser scatter ( ̴ 3-6 ns) and a temperature dependent phase corresponding to the decay of the triplet metal to ligand charge transfer state (³MLCT) with a lifetime of  ̴ 5-12 ns. The longer lifetime RWLC-2 (Co) exhibits photophysics consistent with photoinduced electron transfer (ET) between the RuBpy ³MLCT and the ground state Co³⁺-SBU cluster.