Thiocyanates thioureas

A list of more common silver complexing agents includes thiosulfates, thiocyanates, sulfites, cyanides, ammonia and other amines, thiols, thiourea, thioacids, thioethers and alkali halides. Most are not practical as fixing agents because they fail to satisfy all the above criteria. Many find use as silver halide stabilizers (Section 59.2.1.8). These include thiocyanate, thiourea and other thioorganic compounds. These and other complexing agents such as cyclic imides, phosphines and arsines find use in silver halide diffusion transfer processes (Section 59.2.1.6). 

Thiiranes can be prepared by cyclisation of 2-halo-thiols, but the most common method is via reaction of an epoxide with thiocyanate, thiourea, a phosphine sulfide or with dimethylthioformamide. ... 

Thiols and sulfides, hydrogen sulfide, sodium sulfide, sodium thiocyanate, thiourea, sodium metabisulfide... 

Ammonium thiocyanate Thiourea CH4N4O2 Nitroguanidine CH4O... 

The type of analysis discussed in the preceding paragraph with particular respect to c/ iron(ii) complexes has also been attempted for c/ palladium(ii) and gold(iii) substitutions. In the case of the reactions of [Pd(fo)L], where Hgfo is the formazan (5) and L=ammonia or pyridine, with thiocyanate, thiourea, or triphenylphosphine, a kinetic-thermodynamic analysis shows Gibbs free... 

Mechanistic considerations (Asquith and Otterburn, 1977 Whitaker and Feeney, 1977 Friedman, 1977) suggest that added thiol or sulfite ions can inhibit lysinoalanine formation by at least three distinct mechanisms. The first is by direct competition. The added nucleophile (mercaptide, sulfite, bisulfite, thiocyanate, thiourea, etc.) can trap dehydroalanine residues derived from protein amino acid side chains, forming their respective adducts. In particular, lanthionine side chains (Figure 8)are formed from added cysteine and N-acetyl-cysteine. The second possible mechanism is... 

C8H8l202r Cyclohexane-1,4-dione-diiodoacetylene, 30B, 248 C8H8N402S2Se, o-Nitrobenzeneselenenyl thiocyanate - thiourea, 38B, 603... 

CungFeNgSu, Bis(isothiocyanato)bis(thiourea)irondl), 46B, 983 CftH8HgNgS2, Bis(thiourea)dicyanomercury(II), 37B, 615 CijHgHgNgSu, Mercury(II) thiocyanate-thiourea complex, 28, 113 31B, 401... 

In here, at least one Y is hydrolyzable group, and X is a functional group such as iodine, sulfur, thiocyanate, thiourea, cyanide, etc., which is called bifunctional silane. When X is a hydrogen, it is called monofunctional silane. Two moles of 3-chloropropyltrialkoxysilanes react with one mole of disodium tetrasulphide produces bis-type bifimctional silane, which is called bis(triethoxysilylpropyl)tetrasulfide (TESPT) [171,172]. 

The inner-sphere oxidation of thiocyanate, thiourea, and alkyl-substituted thioureas have been investigated. The reactions are rapid, the process for SCN being too fast to be followed by the stopped-flow method, although in this case the stoicheiometry of the reaction in excess ligand is identical to that for the thioureas,... 

Dig lycol/CHDM/lsophthalates/SIP copolymer DISPERBYK -192 Eastman AQ 29D Eastman AQ 35S Eastman AQ 38D Eastman AQ 38S Eastman AQ 55S Hordaphos 136 PEG-150 dlstear-ate Perfluoroheptane Perfluorohex-ane Perfluoro-N-methylmorphollne Perfluoropentane PF-5050 PF-5052 PF-5060 PF-5070 PF-5080 dispersant, proteins Ammonium thiocyanate Thiourea Urea dispersant, proteins whey processing... 

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