Synthesis and photosensitive release of NO of the cycloruthenated 2-(4-trifluoromethyl)phenylpyridine nitrosyl
Starting the cycloruthenated complex[Ru(bpy)2(4-CF3Hppy)]PF6(bpy=2,2′-bipyridine,4-CF3ppy =2-(4-trifluoromethyl)phenylpyridine)),a new ruthenium(Ⅱ)nitrosyl complex[Ru(bpy)(4-CF3ppy)(CH3CN)NO](PF6)2(complex 1)was synthesized and characterized by NMR,MS,and IR.The characteristic NO+ stretching vibration at 1911 cm-1 and two significant continuous reduction steps of RuⅡNO+→RuⅡNO·and RuⅡNO·→RuⅡNO-in electrochemistry were observed,proving the presence of RuⅡ-NO+.In addition,the dramatic absorption spectral changes under irradiation indicated the possible photo-release of NO,which was further confirmed by EPR spectra.Through the Griess reagent determination,the photosensitive NO release of complex 1 was found significantly higher than those of[Ru(bpy)(ppy)(CH3CN)NO]2+ and[Ru(bpy)(4-OCH3ppy)(CH3CN)NO]2+,due to the introduction of—CF3.The results was consistent with the simulated binding energy between Ru core and nitrosyl.The introduction of electron-withdrawing groups is therefore more conducive to the photosensitive release of NO from RuⅡ-NO+,enabling complex 1 to serve as a photosensitive NO-donor.
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