Citation: Su-Hua Fan, Jie Shen, Hai Wu, Ke-Zhi Wangb, An-Guo Zhang. A highly selective turn-on colorimetric and luminescence sensor based on a triphenylamine-appended ruthenium(II) dye for detecting mercury ion[J]. Chinese Chemical Letters, ;2015, 26(5): 580-584. doi: 10.1016/j.cclet.2014.11.031 shu

A highly selective turn-on colorimetric and luminescence sensor based on a triphenylamine-appended ruthenium(II) dye for detecting mercury ion

1.
a School of Chemical and Materials Engineering, Fuyang Normal College, Fuyang 236037, China;
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b College of Chemistry, Beijing Normal University, Beijing 100875, China;
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c College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China

Received Date: 15 September 2014
Available Online: 17 November 2014
Fund Project: the Innovation Training Program for the Anhui College students (Nos. AH201310371039 and AH201310371041) (No. 1408085QB39)

A dual colorimetric and luminescent sensor based on a heteroleptic ruthenium dye [Ru(Hipdpa)(Hdcbpy)(NCS)₂]^-·0.5H⁺0.5[N(C₄H₉)₄]+ Ru(Hipdpa) {where Hdcbpy = monodeprotonted-4,4'-dicarboxy-2,2'- bipyridine and Hipdpa = 4-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-N,N-diphenylaniline} for selective detection of Hg²⁺ is presented. The results of spectrophotometric titrations revealed an evident luminescence intensity enhancement (I/I₀ = 11) and a considerable blue shift in visible absorption and luminescence maxima with the addition of Hg²⁺. The sensitive response of the optical sensor on Hg²⁺ was attributed to the binding of the electron-deficient Hg²⁺ to the electron-rich sulfur atom of the thiocyanate (NCS) ligand in the Ru(Hipdpa), which led to an increase in the energy gap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). Accordingly, the blue shift in the absorption spectrum of Ru(Hipdpa) due to the binding of Hg²⁺ was obtained. Ru(Hipdpa) was found to have decreased Hg²⁺ detection limit and improved linear region as compared to di(tetrabutylammonium) cis-bis(isothiocyanato)bis(2,2'-bipyridine-4-carboxylic acid-4'- carboxylate)ruthenium(II) N719. Moreover, a dramatic color change from pink to yellow was observed, which allowed simple monitoring of Hg²⁺ by either naked eyes or a simple colorimetric reader. Therefore, the proposed sensor can provide potential applications for Hg²⁺ detection.
- Ruthenium dye,
- Mercury,
- Colorimetric sensor,
- Luminescence sensor
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沈阳化工大学材料科学与工程学院沈阳 110142