Phosphorus oxy-acids

The spectra of a number of inorganic salts of the phosphorus oxy-acids were measured in the NaCl region The absorptions... 

Fig. 2. Principal absorption regions in salts of phosphorus oxy-acids [ ]. rectangles denote absorption in hydrated salts only.

Spectra-correlation charts for salts of phosphorus oxy-acids (2-16 n) [ ], for phosphorus compounds (2-26 l) [ ], for aryl phosphoric acids (2-16 n) and for organosilicon compounds (2-16 n)... 

Jyo, A., Yamabe, K., Egawa, H., Behavior of macroreticular chelating resins having oxy acids of phosphorus in adsorption and elution of lead ion. in Chemistry for the Protection of Environment, 2, eds. L. Pawlowsky, W. J. Lacy, C. G. Uchrin, M. R. Dudzinska, Environmental Science Research, Vol. 55, Plenum Press, New York, 1996, pp. 121-129, ISBN 0-306-45373-8. 

It is sometimes useful to regard the oxy-acids produced in such hydrolyses as derivatives of nonmetal hydroxides, Thus, phosphorus acid, pro-... 

Note that tripositive nitrogen, phosphorus, and arsenic exist as oxy-acids or their derivatives, whereas the more basic tripositive antimony and bismuth exist as positive ions the latter two might be written as more fully hydrated forms, for example, (H20)2Bi(0H)J, but are more often represented as the simpler mono-oxygenated forms, consistent with known salts of the type (SbO)jSOi and BiOCl. Some (but not all) of such salts contain discrete MO+ ions. 

It will be recalled that the designations, hypo-. . -ous, -ous, -ic, and per. , ic (as illustrated above with the oxy-acids of chlorine) refer to a series of acids in which the oxidation number of the central atom progresses in units of 2. Hypophosphoric acid, H4P2O6 (p. 255) is a special case in which the formal oxidation number of phosphorus is between that in the -ous acid and that in the -ic acid. 

In some cases, a single oxidation state of a given nonmetallic element may form more than one oxygen acid or derivatives of more than one oxy-acid, Pentapositive phosphorus has been shown, for example, to yield... 

When white phosphorus is placed in solutions of the salts of the more noble metals the metals are deposited and oxy-acids of phosphorus are found in the solution. The ratios of metal deposited to phosphorus... 

Fluophosphoric Acid.—The tendency of fluorine to replace oxygen in oxy-acids, which is exemplified in such compounds as hydrofluo-boric acid, is shown to some extent in the acids of phosphorus. The existence of alkali fluophosphates has already been alluded to (p. 87). 

Lithium salts of the lower oxy-acids of phosphorus.—Salts of hypo-phosphorous, phosphorous, pyrophosphorous, and hypophosphoric acids have been described.1... 

Khan et al. [28] synthesized the 2,5-disubstituted-l,3,4-oxadiazoles from 3-pyridyl hydrazide and benzoic acid by microwave irradiation taking alumina as the sohd support and phosphorus oxy chloride as a dehydrating agent. ... 

The oxy-acids of phosphorus and their derivatives are defined as compounds which contain both P — OH and P = 0 functions (7-9,12). Ortho-phosphoric acid, phosphorus acid, and hypophosphorous acid are well-known as the oxy-acid compounds that contain three, two, and one OH... 

Phosphorus thioxy acids and phosphorus thio acids, in w hich some or all of the oxygen atoms around the phosphorus atom in the oxy-acids are replaced by sulfur atoms, respectively, are also known (8). Physicochemical properties of selected phosphorus compounds described in Section II are shown in Table Iff. 

Now with ethyl alcohol an exactly analogous reaction occurs and the products are phosphorus oxy-chloride, hydrochloric acid and the chloride of the alkyl radical ethyl. It must be, therefore, that the radical ethyl in alcohol occupies the place of one of the hydrogen atoms in water, the other hydrogen remaining as part of the hydroxyl group. The reaction is then. 

The number and stability of the oxy-acids of phosphorus are in marked contrast to those of nitrogen. The formulae and basicities of the acids are set out in Table 19.6. 

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