Chemodosimetric analysis in food-safety monitoring: design, synthesis, and application of a bimetallic Re(I)-Pt(II) complex for detection of dimethyl sulfide in foods.
Detection of neutral biogenic sulfides plays a crucial role in food safety. A new heterobimetallic Re(I)-Pt(II) donor-acceptor complex--[Re(biq)(CO)3(CN)]-[Pt(DMSO)(Cl)2] (1, biq = 2,2'-biquinoline)--was synthesized and characterized. The X-ray crystallographic and photophysical data for 1 are reported in this study. Complex 1 indicated the luminescent chemodosimetric selectivity for dimethyl sulfide, which persisted even in the presence of a variety of interfering vapors, with a detection limit as low as 0.96 ppm. The binding constant (log K) of 1 toward dimethyl sulfide was 3.63 ± 0.03. The analyte selectivity of the complexes was found to be dependent on the ligand coordinated to the Re(I) center. Real samples (beef, chicken, and pork) were monitored real-time for gaseous dimethyl sulfide. Complex 1 shows a linear spectrofluorimetric response with increasing storage time of the meats at 30 °C.
Department of Science and Environmental Studies, The Hong Kong Institute of Education, 10 Lo Ping Road, Tai Po, Hong Kong SAR, China. cfchow@ied.edu.hk.
Cheuk-Fai
CF
Chow
Fu-Wen
FW
Gong
Cheng-Bin
CB
Gong
D000818:Animals; D002417:Cattle; D002645:Chickens; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D064088:Hazard Analysis and Critical Control Points / Q000379:methods*; D057230:Limit of Detection; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008163:Luminescent Measurements / Q000379:methods; D008460:Meat / Q000032:analysis*; D010984:Platinum / Q000737:chemistry*; D011804:Quinolines / Q000138:chemical synthesis / Q000737:chemistry; D012211:Rhenium / Q000737:chemistry*; D013440:Sulfides / Q000032:analysis*; D013552:Swine
D056831:Coordination Complexes; D049408:Luminescent Agents; D011804:Quinolines; D013440:Sulfides; C419881:2,2'-biquinoline; D010984:Platinum; D012211:Rhenium; C004784:dimethyl sulfide