Ảnh hưởng của lực ion và một số ion lạ đến động học phản ứng quang oxi hóa khử giữa phức rutheni(II) polypyridin và axtt amin tyrosin

Phạm Thị Thủy, Nguyễn Thị Ánh Hường, Phạm Thị Ngọc Mai, Nguyễn Xuân Trường

Abstract


Ruthenium(II) polypyridine – [Ru(bpy)3]Cl2 complex give a maximum emission at lem = 605 nm and its excited state decays by the first-order equation with  k0 = 1.64 (± 0.01) ´ 106 s-1. Kinetics of the photoinduced electron transfer reaction between [Ru(bpy)3]Cl2 complex and acid amine Tyrosine is investigated by time-resolved molecular emission spectroscopy. The results show that the photoinduced electron transfer rate constants (kq) vary small (~ 7 %) in the solutions with ionic strength I = 0-0.05 M. However, kq-values decrease more than twice if I ³ 0.1 M. On the other hand, the presence of the specific ions such as Ca2+, NH4+ and PO43- in the solution does not influence the reaction kinetics.

Keywords. Ruthenium(II) polypyridine, Tyrosine, ionic strength, photoinduced electron transfer, time-resolved molecular emission spectroscopy.


Keywords


Ruthenium(II) polypyridine, Tyrosine, ionic strength, photoinduced electron transfer, time-resolved molecular emission spectroscopy

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References


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