Trifluoromethyl substitution enhances photoinduced activity against breast cancer cells but reduces ligand exchange in Ru(ii) complex.

59 There is a clear trend in the chemical shift of the bound phosphine signal across the series as a function of the substituents, where electron-withdrawing substituents result in deshielding of the phosphine atoms, leading to signals that shift from 42.2 ppm in 1 to 49.5 ppm in 5 .

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These data show that the quantum yield of ligand exchange is dependent on the substituent on the ancillary phosphine ligand, however, it is an unexpected trend based on the lower energy 1 MLCT absorption of 1 as compared to 5 .

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