Sulfur-nitrogen-halogen compounds

Thiazyl fluoride, NSF, is a colourless, reactive, pungent gas (mp —89°, bp -)-0.4°). It is best prepared by the action of HgF2 on a slurry of S4N4 and CCI4 but it can also be made by a variety of other reactions  

The structures of N3S3F3 and N4S4F4 are in Fig. 15.45. The former features a slightly puckered 6-membered ring (chair conformation) with essentially equal S-N distances around the ring and 3 eclipsed axial F atoms. By contrast. 

Owen and A. T. Brooecer, A Guide to Modern Inorganic Chemistry, Longman Scientific and Technical, Harlow 1991, pp. 120-1. 

In the chloro series, the compounds to be considered are N=S-C1, cyc/o-N3S3Cl3, cyclo-N3S3CI3O3, and cyc/o-N4S4Cl2 the ionic compounds [S4N3] C1 and [cyc/o-N2S3Cl]+Cl and [c 2/ 2-N(SCl)2] [BCl4] together with various isomeric oxo- and fluoro-chloro derivatives. Thi-azyl chloride, NSCl, is best obtained by pyrolysis of the trimer in vacuum at 100°. It can also be made by the reaction of CI2 on NSF (note that 

By far the most common compound in the series is N3S3CI3 (yellow needles, mp 168°) which can be prepared by the direct action of CI2 (or S(3Cl2) on S4N4 in CCI4, and which is also obtained in all reactions leading to NSCl. The structure (Fig. 15.46a) is very 

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Glemser, O. M., "Sulfur-Nitrogen-Halogen Compounds," Int. J. Sulfur Chem. 1971, 6, 35. 

His scheme of nomenclature for nitrogen compounds, and the names thio-, chloro-, etc, did become widespread, especially for sulfur and halogen compounds. 

Following pyrolysis of column effluent, unwanted species are removed and the relevent products mixed with a liquid (alcohol/water) and differential conductivity subsequently measured. Depending upon the reaction gas used and whether the process is reductive or oxidative, speciflcity for nitrogen, sulfur or halogen compounds can be obtained l... 

Table 9. Open-chain tiifunctional nitrogen, halogen and sulfur compounds.

Some of the newer compounds may contain both saturated and unsaturated rings, heteroatoms such as oxygen, nitrogen, or sulfur, and halogen substituents. Others, such as synthetic pyrethroids, may have one or more chiral centers, often needing stereospecific methods of synthesis or resolution of isomers (42). Table 4 Hsts examples of some more complex compounds. Stmctures are shown ia Eigure 1 (25). 

The chemistry of sulfur is a broad area that includes such chemicals as sulfuric acid (the compound prepared in the largest quantity) as well as unusual compounds containing nitrogen, phosphorus, and halogens. Although there is an extensive chemistry of selenium and tellurium, much of it follows logically from the chemistry of sulfur if allowance is made for the more metallic character of the heavier elements. All isotopes of polonium are radioactive, and compounds of the element are not items of commerce or great use. Therefore, the chemistry of sulfur will be presented in more detail. 

The most commonly used and widely marketed GC detector based on chemiluminescence is the FPD [82], This detector differs from other gas-phase chemiluminescence techniques described below in that it detects chemiluminescence occurring in a flame, rather than cold chemiluminescence. The high temperatures of the flame promote chemical reactions that form key reaction intermediates and may provide additional thermal excitation of the emitting species. Flame emissions may be used to selectively detect compounds containing sulfur, nitrogen, phosphorus, boron, antimony, and arsenic, and even halogens under special reaction conditions [83, 84], but commercial detectors normally are configured only for sulfur and phosphorus detection [85-87], In the FPD, the GC column extends... 

Results for vapor pressure as a function of temperature are presented for major organic chemical compounds. The coefficients are displayed in an easy-to-use table which is especially applicable for rapid engineering usage with the personal computer or hand calculator. The organic chemicals encompass hydrocarbon, oxygen, nitrogen, halogen, silicon, sulfur and other chemical type compounds. 

Sulfur- and nitrogen-containing compounds will produce their corresponding oxides and should not be incinerated without considering their effects on air quality. Halogenated hydrocarbons not only may affect air quality but also may corrode the incinerator. Also, organo-metallic compounds containing cadmium, mercury, and so on, are not recommended for incineration because of the potential for air and solid waste contamination. 

Landtreat is a silicate-based inorganic polymer catalyst used for the ex situ treatment of contaminated soils. The vendor claims that it acts as a catalyst to degrade halogenated compounds and organic compounds containing nitrogen and sulfur. 

The index of hydrogen deficiency can be calculated for compounds containing carbon, hydrogen, nitrogen, halogen, oxygen, and sulfur from the formula... 

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