Hypophosphite ion

The interesting complex chemistry of rhodium has been rather neglected this is probably because most of the synthetic methods for obtaining complexes have been tedious. In general, substitutions of chlorine atoms bonded to rhodium by other ligands are slow, and products have usually been mixtures. The situation is now changing, since novel catalytic approaches to rhodium complexes have been developed.1 The catalysis in the present synthesis involves the rapid further reaction of the hydrido complex formed from l,2,6-trichIorotri(pyridine)rho-dium(III) in the presence of hypophosphite ion. 

Elemental composition H 4.58%, P 46.94%, O 48.49%. The hypophosphite ion may he oxidized to orthophosphate by careful oxidation. The orthophophate, PO4 ion, may he measured by colorimetry either hy using ammonium molybdate and vanadium (yellow color), ammonium molybdate and stannous chloride (blue color), or ammonium molybdate, potassium anti-monyl tartrate and asorbic acid (an intense blue color). Absorbances of the solution are read at 400 (or 470), 650 (or 690) and 880 nm, respectively. Hypophosphite ion alternatively may be identified by ion chromatography. 

Nickel oligomers prepared in the presence of PA (Amax = 540 nm) (Section 20.4.2) may also act as catalysts for the reduction of Ni by hypophosphite ions. This requires, as shown by pulse radiolysis, a critical nuclearity, while free Ni cannot be reduced directly by H2PO2. Very low radiation dose conditions, just initiating the formation of a few supercritical nuclei, will lead to large particles of nickel [96]. 

Hi36Moi54Na2i053oP7 -3OOH2O, Molybdatc, polyoxo-, wheel-shaped cluster with hypophosphite ion, hydrate, 34 199 H 52Mo 53Na 50528.5 400H20, Alolybdate, polyoxo-, wheel-shaped cluster, hydrate, 34 197... 

The solution remaining from the preparation of phosphine from phosphorus and alkali contains the hypophosphite ion, HgPOn". The corresponding acid, hypophosphorous acid, HHgPO., cd be prepared by using barium hydroxide as the alkali, thus forming barium hypo... 

The acid and the hypophosphite ion are powerful reducing agents, able to reduce the cations of copper and the more noble metals. 

Treatment of with hot alkali or alkaline-earth hydroxide solutions occurs principally in two ways to form PHj and the phosphite and hypophosphite ions " ... 

The BafHjPOj) formed is a major source of the hypophosphite ion and the source of HjPOj which is obtained upon H SO acidification of the salt. Moderate yields of PHj are reported from reaction with Oj in HjO at 19°C ... 

The disadvantage of chromatographic systems is that compounds can remain on the columns or move down the column so slowly that they are missed. For example, under the conditions for phosphate and phosphite ions, no peaks were found for pyrophosphate or hypophosphite ions. (Other oxophosphorus acids, including those mentioned in Ohashl and Yoza s paper, were not available for this study.) Different chromatographic conditions may reveal these and other phosphorus compounds in a PSG film. 

H2O have been isolated as single crystals and their heats of formation and stabilities discussed. The structure of C02P2O7 has been reported. It has been shown that the first stage in the reduction of Co" by hypophosphite ions is the formation of a 1 1 complex. Salts of MCo"Wi (M = P,... 

As a typical example, we can mention nickel electroless plating. The process generally utilizes hypophosphorous acid solution. When iron is immersed into the solution, the metal surface works as a catalyst and promotes the dehydrogenatimi reaction of hypophosphite ion as follows. 

Ammonium phosphinidoborane is obtained as an ionic solid when H3P-BH3 is dissolved in liquid ammonia and kept at -45°C. The phosphinidodiborane ion (bis(borane)hypophosphite ion), can also be obtained by reacting diborane with potassiophosphine in ethereal solution (9.66), from phos-phonium iodide and sodium borohydride (9.67) or from phosphine borane (9.68). 

The reaction between perruthenate and hypophosphite ion, HaPOa", has been studied in basic media. The rate law is of the form... 

From the ability of the minimal bromate system to oscillate in the CSTR, one may infer that the malonic acid in the BZ system could be replaced by an input flow of bromide or indeed of any other species capable of generating bromide from bromate at an appropriate rate. This insight led to the discovery of the bromate-chlorite-reductant [14] and bromate-manganous-reductant [27] families of new bromate oscillators. A similar system [28] consists of bromate, manganous and hypophosphite ions in a batch reactor with a stream of N2 gas to remove the product bromine. 

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