Structural, spectral and magnetic studies of two Co(II)-N-heterocyclic diphosphonates based on multinuclear units

Coupling Ruthenium Bipyridyl and Cobalt Imidazolate Units in a Metal–Organic Framework for an Efficient Photosynthetic Overall Reaction in Diluted CO2

“…Photoluminescence (PL) spectroscopy was also conducted to investigate the charge separation efficiency of the photocatalyst (Figure a). Upon excitation at 475 nm, MAF-34-Co shows an emission peak at 610 nm, which can be ascribed to the metal-perturbed π*−π charge transfer of the organic ligand. , Upon excitation at 465 nm, [Ru­(Hip) 3 ]­Cl 2 exhibited an emission peak centered at ∼700 nm (quantum yield = 3%), which is assigned to the metal-to-ligand charge transfer process. , The PL intensity was slightly weakened using a mechanical mixture of MAF-34-Co and [Ru­(Hip) 3 ]­Cl 2 and almost completely quenched in MAF-34-CoRu (quantum yield < 1%), indicating the efficient photoinduced electron transfer between the {Ru­(ip) 3 } − and {Co­(ip) 4 } 2– units sharing the aromatic ip – ligand. Moreover, the photoluminescence lifetime of [Ru­(Hip) 3 ]­Cl 2 was determined to be ca.…”