For 16 the use of THF or ethanol were the appropriate solvents in terms of solubility; however, the fluorescence yield was calculated to be less than 0.01 in both solvents with a broad emission band at ~610 nm (Error! Reference source not found.). Similarly, a low yield was reported for the homoleptic 4-carboxyphenyl rhodium(III) complex derivative whilst counterparts of Co(III) ML3 are completely non-emissive. 3.3. Time-correlated Single Photon Counting (TCSPC)