Nitroso-iodic acid

According to N. A. E. Millon,2 when dry finely powdered iodine is treated with ten times its weight of the most cone, nitric acid, a voluminous yellow powder is obtained which can be dried on a porous plate it contains iodine, oxygen, and nitric acid, and was regarded as nitroso-iodic acid. If the iodine nitrate is treated with a current of dry carbon dioxide or air, or dried on a porous tile over lime so long as nitrogenous fumes are given off, it is decomposed into iodine dioxide and... 

As indicated in connection with iodine tetroxide, N. A. E. Millon observed the formation of what he considered to be nitroso-iodic acid, and H. Kammorer what he considered to be iodine dinitrosyl tetroxide, I204(N0)8, or maybe O I.O.NO, by treating iodine with nitric acid, or nitrosylsulphuric acid. The yellow powder was considered by H. Kappeler to be iodine nitrate, T.NOj, vide 2. 19, 9. E. Briner said that mixtures of nitric and hydriodie acids do not form a univariant system like stabilized aqua regia, for the iodine produced as a result of the primary reaction is oxidized to iodic acid, with the evolution of nitric oxide. 

The nitroso-phenol reaction, when applied to extractives of chlorodyne, is subject to interference from substances other than morphine present in the residue. Garratt- drew attention to apparent morphine contents of treacle. McLachlan " reported the interference from liquorice as being due to the colour which develops with ammonia and glycyrrhizin and some of its hydrolysis products. The apparent morphine contents of both treacle and liquid extract of liquorice were also reported on in 1956. By the extraction procedure detailed below morphine can be separated from the substances present in liquorice which give a yellow colour with ammonia and the iodic acid-nickel chloride reaction may then be applied. 

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