نتایج جستجو برای: cyanides
تعداد نتایج: 4237 فیلتر نتایج به سال:
The potential health hazards of handling industrial fish are well documented. Wet fish in storage consume oxygen and produce poisonous gases as they spoil. In addition to oxygen depletion, various noxious agents have been demonstrated in association with spoilage including carbon dioxide, sulphur dioxide, and ammonia. A fatal case of methane and cyanide poisoning among a group of deep sea trawl...
The synthesis of organic nitriles without using toxic cyanides is in great demand but challenging to make. Here we report an environmentally benign and cost-efficient synthesis of nitriles from the direct oxidative cyanation of primary carbon-hydrogen bonds with easily available molecular oxygen and urea. The key to this success is to design and synthesize manganese oxide catalysts fixed inside...
Sixty years after the seminal Miller-Urey experiment that abiotically produced a mixture of racemized amino acids, we provide a definite proof that this primordial soup, when properly cooked, was edible for primitive organisms. Direct admixture of even small amounts of Miller-Urey mixture strongly inhibits E. coli bacteria growth due to the toxicity of abundant components, such as cyanides. How...
Treatment of [HNBu3]3[Mo(V)(CN)8] with manganese(II) p-toluenesulfonate in N,N'-dimethylformamide (DMF) affords {[Mn(II)(DMF)4]3[Mo(V)(CN)8]2}n (1) as a two-dimensional network. The structure of 1 consists of [cis-Mn(II)(DMF)4(mu-NC)2]2+ and [trans-Mn(II)(DMF)4(mu-NC)2]2+ units that are linked via cyanides to three-connected [Mo(V)(CN)5(mu-CN)3]3- centers in a 4:2:6 ratio, forming 12-membered r...
In this study, a rapid flow injection-flame atomic absorption spectrometry for cyanide detection was developed. Different AgX (where X is Cl(-), Br(-), I(-) and N(3)(-)) solid-phase reagents (SPR) were tested for indirect determination of cyanide. In a single-line FIA system, the cyanide was allowed to react with AgX SPR, which in turn changed Ag ions in AgX to silver cyanide complexes in a sod...
A series of novel cyano-bridged mixed-valent copper complexes with different nuclearities, where the cyanide group is obtained from the cleavage of a carbon-carbon (C-C) bond in acetonitrile under mild conditions, have been prepared and structurally characterized via a completely in situ synthetic method. The method is catalyzed by 2,2'-bipyridine and 1,10-phenanthroline-based Cu(II) complexes ...
By combining the organometallic cyanides L n M-CN [L n M = Cp(dppe)Fe, Cp(dppe)Ru, Cp(PPh 3 ) 2 Ru] with FeCl 3 the dinuclear complexes L n M-CN-FeCl 3 were obtained. Structure determinations have revealed configurations close to linear arrays Fe-C-N-Fe and Ru-CN-Fe. From the n(CN) band positions in their IR spectra it can be concluded that FeCl 3 is a very strong electron acceptor. Accordingly...
Bioassays on aqueous and solid phases of contaminated soils were compared, belonging to a wide array of trophic and response levels and using ecoscores for evaluating ecotoxicological and genotoxicological endpoints. The method was applied to four coke factory soils contaminated mainly with PAHs, but also to a lesser extent by heavy metals and cyanides. Aquatic bioassays do not differ from terr...
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