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Effect of pH in the photoluminescence of a ruthenium complex featuring a derivative of the ligand pyrazine[2,3-f][1,10]-phenanthroline

2015; Elsevier BV; Volume: 146; Linguagem: Inglês

10.1016/j.saa.2015.03.067

1873-3557

Sebastián Pizarro, Miguel Gallardo, Constanza Leyton, Eileen Castro, Francisco Gajardo, Álvaro Delgadillo,

Porphyrin and Phthalocyanine Chemistry

A new ruthenium complex, [Ru(bpy)2(dbe-ppl)](PF6)2 (bpy = 2,2′-bipyridine and dbe-ppl = dimethyl 4,4′-(pyrazino[2,3-f][1,10]phenanthroline-2,3-diyl)dibenzoate, has been synthesized and characterized by 1H NMR spectroscopy, UV–Vis, IR, and cyclic voltammetry. Irradiation on the MLCT band results in photoluminescence in both protic and aprotic solvents. The photoluminescence in water is pH dependent, it shows a behavior which can be described by the Henderson–Hasselbalch assuming the protonation/deprotonation of the excited state with a pKa of 2.40 ± 0.01.