A low-cost optical fiber sensor to detect volatile organic compounds has been developed. Changes of up to 13.5 dB in the transmitted optical power have been detected with different concentrations of acetone and dichloromethane vapors. The device uses a standard single-mode fiber. The sensing mechanism relies on a vapor-induced refractive index change in a film of a vapochromic material deposited on the thinner region of a tapered fiber.

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A series of alkynethiolate gold(I) derivatives have been synthesised by the cleavage of 4-monosubstituted 1,2,3-thiadiazoles in the presence of strong bases. The syntheses of the 1.2,3-thiadiazoles with p-cyanophenyl, p-tolyl, 2-thienyl, 3-thienyl and 9,9-dimethylfluoren-2-yl fragments are also described. All the complexes have been characterised by spectroscopic techniques and the complexes [Au(p-CH3-C6H4-C[triple bond]C-S)PPh3], [Au(3-C4H3S-C[triple bond]C-S)PPh3] and PPN[Au(p-CH3-C6H4-C[triple bond]C-S)(C6F5)] by X-ray analysis. The electrochemically polymerizable mononuclear bis(alkynethiolate) gold(I) complex PPN[Au(3-C4H3S-C[triple bond]C-S)2] is also described, including its electropolymerization and electrochemical properties.

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The methanide carbon of [Au(C6F5)(PPh2CHPPh2Me)] acts as a nucleophilic center toward reagents such as carbon disulfide and isothiocyanates, affording [AuIII{PPh2C(PPh2Me)C(X)S}2][AuI(C6F5)2] (X = S (1), 4-ClC6H4N (2), PhN (3)) through a carbon−carbon coupling reaction. The X-ray structure of 1 shows the ligand PPh2C(PPh2Me)C(X)S acting as a bidentate P,S-chelate.

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