Add time:08/08/2019         Source:sciencedirect.com

The equilibrium constant (K) of photochemical inversion between Δ- and Λ-[Ru(S-am)(bpy)2]+ (bpy=2, 2′- bipyridine (bpy); S-am=(S)-alaninato (S-Ala), (S)-phenylglycinato (S-Phg), (S)-leucinato (S-Leu), (S)-phenylalaninato (S-Phe) or (S)-tyrosinato (S-Tyr) ligand) was obtained in H2O, D2O, CH3OH and CH3CNH2O (1:1 in molar ratio) solutions at temperatures of 0 to 100 °C, and ΔH° and ΔS° were estimated. The hydrophilic solvation favored the Δ isomer in water, appearing on the enthalpy difference, and the hydrophobic solvation preferred the Λ isomer, controlling the entropy difference. These opposite effects dominated the stability of the two isomers of the complex containing the S-Leu, S-Phe or S-Tyr ligand in water. The results suggested the importance of intramolecular hydrophobic bonding. The photochemical inversion hardly occurred in pure acetonitrile.

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