Organic iodine compounds

The organic iodine compounds have lower heats of formation and greater reactivities than their chloro and bromo analogues. As ia the case of the inorganic iodides, their iadexes of refraction and specific gravities are higher than the corresponding chloro and bromo derivatives (121). 

Iodide ions and organic iodine compounds e.g. thyroxine, triiodo- and tetraiodothyronine... 

The course of the reaction has not been elucidated. Probably redox reactions involving cerium(IV) and arsenic(III) are catalyzed by iodide ions and organic iodine compounds with methylene blue acting as a redox indicator. 

Iodides and organic iodine compounds produce brilliant blue chromatogram zones on a yellow background. 

Note The detection limits for iodides and organic iodine compounds are reported to be 50 to 100 ng substance per chromatogram zone. 

In general the iodonium bases are formed from iodoso- and iodoxy-compounds in the presence of alkali, preferably silver oxide the two organic iodine compounds combine with elimination of iodate. 

L. Smith. Combustion in a Bomb of Organic Iodine Compounds. In Experimental Thermochemistry, vol. 1 F. D. Rossini, Ed. Interscience New York, 1956 chapter 10. 

Iodine differs in many aspects from the other halogens. Because of the large atomic size and the relatively low ionization energy, it can easily form stable polycoordinate, multivalent compounds. Interest in polyvalent organic iodine compounds arises from several factors (a) the similarity of the chemical properties and reactivity of I(III) species to those of Hg(+2), Tl(+3), and Pb(+4), but without the toxic and environmental problems of these heavy metal congeners ... 

However, we believe that the inorganic species predominate because they react instantaneously with sulfite (56), whereas organic iodine compounds have significant reaction times (57). We did not add sulfurous acid, which converts IOs to T. On the basis of this data, we suggest that oxidation of I to I03 in the marine atmosphere may be more important than the corresponding reaction in seawater for the recycling of L to I03. Our data support the earlier radiochemical work of Luten et al. (53), who found similar results. 

Organic Iodine Compounds Tabl 102 Classification and List of Names and Formulae of Contrast Agents 497... 

Potential Radiopaques. A large number of organic iodine compounds synthesized in search of improved contrast agents are described in the patent literature limitation of space does not allow a full tabulation of these compounds. Because information concerning them may prove to be of value in the design and synthesis of new potential contrast agents, this chapter lists only the potential nonionic radiopaques, where the main current research effort is centered. Summaries of research on ionic contrast media may be found in early references (211,271). 

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