title: Hydrophilic Indolium Cycloruthenated Complex System for Visual Detection of Bisulfite with a Large Red Shift in Absorption.
abstract: Bisulfite, as an important additive in foodstuffs, is one of the most widely distributed environmental pollutants. The excessive intake of bisulfite may cause asthmatic attacks and allergic reactions. Therefore, the determination and visual detection of bisulfite are very important. Herein, a newly designed hydrophilic indolium cycloruthenated complex, [Ru(mepbi)(bpy)2](+) [1; bpy = 2,2'-bipyridine and Hmepbi = 3,3-dimethyl-1-ethyl-2-[4-(pyridin-2-yl)styryl]benzo[e]indolium iodide (3)], was successfully synthesized and used as a bisulfite probe. The bisulfite underwent a 1,4-addition reaction with complex 1 in PBS buffer (10 mM, pH 7.40), resulting in a dramatic change in absorption spectra with a red shift of over 100 nm and a remarkable change in solution color from yellow to pink. It is worth noting that this obvious bathochromic shift is rarely observed in the detection of bisulfite through an addition reaction. The detection limit was calculated to be as low as 0.12 μM by UV-vis absorption spectroscopy. Moreover, complex 1 was also used to detect bisulfite in sugar samples (granulated and crystal sugar) with good recovery.
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities , Wuhan 430074, China.
authors.forename: Xianlong
authors.initials: X
authors.lastname: Su
authors.affiliation: Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts & Telecommunications , Nanjing 210023, China.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Hu
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities , Wuhan 430074, China.
authors.forename: Xianghong
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities , Wuhan 430074, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities , Wuhan 430074, China.
authors.forename: Facheng
authors.initials: F
authors.lastname: Luo
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities , Wuhan 430074, China.
authors.forename: Xuehu
authors.initials: X
authors.lastname: Niu
authors.affiliation: Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities , Wuhan 430074, China.
authors.forename: Mei
authors.initials: M
authors.lastname: Li
authors.affiliation: Key Laboratory for Organic Electronics & Information Displays and Institute of Advanced Materials, Nanjing University of Posts & Telecommunications , Nanjing 210023, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhao
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D007211:Indoles / Q000737:chemistry*; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy; D017975:Ruthenium Compounds / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013447:Sulfites / Q000737:chemistry*
chemical_list: D007211:Indoles; D017975:Ruthenium Compounds; D013447:Sulfites; C042345:hydrogen sulfite