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Self-Assembly of 1,2-Benzenedithiol on Gold and Silver: Fourier Transform Infrared Spectroscopy and Quartz Crystal Microbalance Study

Self-Assembly of 1,2-Benzenedithiol on Gold and Silver: Fourier Transform Infrared Spectroscopy and Quartz Crystal Microbalance Study. Lee, Young Joo; Jeon, Il Cheol; Paik, Woon-kie; Kim, Kwan ( Department of Chemistry, Seoul National University, Seoul 151-742, S. Korea). Langmuir, 12(24), 5830-5837 (English) 1996 American Chemical Society. CODEN: LANGD5. ISSN: 0743-7463. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Section cross-reference(s): 73 The adsorption of 1,2-benzenedithiol (1,2-BDT) in C6H6 on Au and Ag surfaces was studied by IR reflection-absorption (IRA) spectroscopy, quartz crystal microbalance (QCM), and ellipsometry. The IRA spectral data are consistent with those of QCM and ellipsometry. On both metals, 1,2-BDT was chemisorbed by forming 2 metal-sulfur bonds after deprotonation. Although monolayered film was formed exclusively on Au, multilayered film can also be formed on Ag. The orientation on Au changed little with respect to the surface coverage, but structural change from vertical to tilted orientation occurred on Ag at the fractional surface coverage near 0.6. The tilt angles of C6H6 ring were estd. to be ~ 51° on Au and 38° on Ag with respect to the surface normal. From the anal. of the IRA peak intensities, the free energy of adsorption (DGa0) under submonolayer coverage limit was estd. to be -27.3 kJ/mol on Au and -39.6 kJ/mol on Ag, suggesting that adsorption on Ag would be more favorable energetically than that on Au. The multilayered film formed on Ag consisted of aggregates of randomly oriented Ag thiolate.

Identification and Quantitation by High-Performance Liquid Chromatography of Mancozeb Following Derivatization by 1,2-Benzenedithiol

Identification and Quantitation by High-Performance Liquid Chromatography of Mancozeb Following Derivatization by 1,2-Benzenedithiol. Debbarh, Ikram; Titier, Karine; Deridet, Evelyne; Moore, Nicholas ( Departement of Pharmacology, Universite Victor Segalen, Bordeaux 33076, Fr.). Journal of Analytical Toxicology, 28(1), 41-45 (English) 2004 Preston Publications. CODEN: JATOD3. ISSN: 0146-4760. DOCUMENT TYPE: Journal CA Section: 4 (Toxicology) Ethylenebisdithiocarbamate (EBDC) fungicides are the most important class of org. fungicides and exhibit a high degree of carcinogenicity, mutagenicity, and neurotoxicity. For that reason, the safe application of these fungicides in practice requires a convenient method for their detn., applicable to biol. fluids. The authors describe aHPLC (HPLC) assay. After elimination of the metal which defines the product (maneb, mancozeb, zineb...) with EDTA, the resulting EBDC is derivatized with 1,2-benzenedithiol to yield a cyclocondensation product, 1,3-benzodithiole-2-thione, which can then be quantitated by reversed-phase HPLC at 365 nm using a mBondapak C18 column. The mobile phase was methanol/H2O (, vol./vol.). The assay was linear from 0.25 to 100 mg/mL. Within- and between-day precision and accuracy for this assay were better than 9% and 6%, resp. The lower limits of detection and quantitation were estd. to be 0.1 and 0.25 mg/mL, resp. This simple new method was applied to det. mancozeb concn. in rat urine samples from urinary excretion studies. (c) 2004 Preston Publications.