KCS Publications

HOME > Search > Browsing(BKCS) > Archives

Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 12, Number 6
BKCSDE 12(6)
June 20, 1991

Title	Comparative Study of Emission Quenching of Tris(α,α'-diimine)-Ruthenium(Ⅱ) Complexes in Homogeneous and Sodium Dodecyl Sulfate Micellar Solutions
Author	Joon Woo Park*, Eun Jin Nam, Byung-Tae Ahn
Keywords
Abstract	Emission quenching of photoexcited tris(α,α '-diimine)-ruthenium(Ⅱ) complex cations, RuL32+ (L: 2,2'-bipyridine, 4,4'-dimethyl-2,2'-bipyridine; 4,4'-diphenyl-2,2'-bipyridine; 1,10-phenanthroline; 5-methyl-1,10-phenanthroline; 5,6-dimethyl-1,10-phenanthroline or 4,7-diphenyl-1,10-phenanthroline) by Cu2+, dimethylviologen (MV2+), nitrobenzene (NB), and oxygen was studied in aqueous homogeneous and sodium dodecyl sulfate (SDS) micellar solutions. The apparent bimolecular quenching rate constants kq were determined from the quenching data and life-times of RuL32+. In homogeneous media, the quenching rate was considerably slower than that for the diffusion-controlled reaction. The decreasing order of quenching activity of quenchers was NB > O2 > MV2+ > Cu2+. The rate with Cu2+ was faster as the reducing power of RuL32+ is greater. On the other hand, the rates with NB and O2 were faster as the ligand is more hydrophobic. This was attributed to the stabilization of encounter pair by van der Waals force. The presence of SDS enhanced the rate of quenching reactions with Cu2+ and MV2+, whereas it attenuated the quenching activity of NB and O2 toward RuL32+. The binding affinity of quenchers to SDS micelle and binding sites of the quenchers and RuL32+ in micelle appear to be important factors controlling the micellar effect on the quenching reactions.
Page	686 - 691
Full Text	PDF

How to access to the WOL for The Bulletin of the Korean Chemical Society ?

The Bulletin of the Korean Chemical Society will be co-published with Wiley-VCH from 2015 towards. The online version of the Journal will thus be available on Wiley Online Library, Wiley(-VCH)'s global online platform.

KCS members can get a free online access to the Bulletin of the Korean Chemical Society in WOL.

Free Access to WOL