Transient species in the pulse radiolysis of periodate ion in neutral aqueous solutions

Barat, F.; Gilles, L.; Hickel, B.; Lesigne, B.

doi:10.1039/c29710000847

Cited by 18 publications

(7 citation statements)

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“…The pseudo first order decay observed in electron pulse irradiated IV" solutions at pH 5-7 is assigned to reaction ( 28 (21), (-21) and (24).…”

Section: Photolysis Of Pbriodate a N D Periodic A C I Dmentioning

confidence: 89%

“…The secondary reaction of Ivl is eqn (28). The secondary reaction of OH with IV1I is (13) followed by some or all of reactions (20)- (24). This means that we have the following relations among the yields Y and among the quantum yields 4 @ 10,-= @H202 + @ IV" + QO,…”

Section: Photolysis Of Periodate a N D P E R I O D I C A C I Dmentioning

confidence: 97%

“…The secondary reactions of OH with IV1I and (Iv11)2 are reactions ( 13) and ( 19) followed by some or all of reactions (20)- (24). The reaction of H202 is eqn (37).…”

Section: Photolysis Of Periodate a N D P E R I O D I C A C I Dmentioning

confidence: 99%

“…FIG.2.-Transient absorbance OD at 525 nm after flashing (energy 3240 J) a mol dm-3 IVII solution containing 2 x lW3 mol dm-3 NaOH plotted against time. Continuous curve is calculated by numerical integration of rate equations corresponding to reactions (20),(21),(-21) and(24).…”

mentioning

confidence: 99%

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Photolysis of periodate and periodic acid in aqueous solution

Kläning¹,

Sehested²

1978

J. Chem. Soc., Faraday Trans. 1

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The photochemistry of periodate and periodic acid in aqueous solution was studied (i) by quantum yield measurements at low light intensity (ii) by flash photolysis, and (iii) by photolysis of glassy samples at 77 K. The photochemical studies were supplemented with pulse radiolysis studies of aqueous periodate solutions and with kinetic studies using stopped-flow technique. In strongly alkaline solution the photodecomposition of periodate proceeds via formation of 0and I v I .At pH < 12 an additional primary process is the formation of IV and H202. In neutral solution 0 3 P is formed in a small yield. The energetics of the reaction of O'D with HzO with formation of H20z is discussed. It is suggested that oxygen atoms are formed only from 10; and not from other IVII species. Mechanisms for the secondary processes involving IvIII and IVI are given. IVIII and its relatively stable complex with IVII both form IV. IVII and 02. Depending on pH and concentration, IVI either disproportionates to I V and P I , reacts with IVII with formation of I V and P I 1 1 or dissociates into 0-(OH) and IV.Investigations of photodecomposition of the oxyanions XO,, n = 1-3 of chlorine, bromine and iodine in aqueous solution indicate that the primary reactions are one or more of reactions (1)-( 4) ?l v xo, -+ xo,*-1 + 0xo,--+ X O ~--~ + 0 3 ~ xs, + X0,Y-I + UID xo,; -+ xo,z+o2 hv EL V k v

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“…The pseudo first order decay observed in electron pulse irradiated IV" solutions at pH 5-7 is assigned to reaction ( 28 (21), (-21) and (24).…”

Section: Photolysis Of Pbriodate a N D Periodic A C I Dmentioning

confidence: 89%

Section: Photolysis Of Periodate a N D P E R I O D I C A C I Dmentioning

confidence: 97%

“…The secondary reactions of OH with IV1I and (Iv11)2 are reactions ( 13) and ( 19) followed by some or all of reactions (20)- (24). The reaction of H202 is eqn (37).…”

Section: Photolysis Of Periodate a N D P E R I O D I C A C I Dmentioning

confidence: 99%

mentioning

confidence: 99%

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Photolysis of periodate and periodic acid in aqueous solution

Kläning¹,

Sehested²

1978

J. Chem. Soc., Faraday Trans. 1

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“…It is claimed that crystalline barium iodate(VI) can be obtained by heating the amorphous BaI04,H 2 0 in a eutectic mixture of sodium and potassium nitrates at 250°C; the solid gives rise not only to a sharp X-ray diffraction pattern quite different from that of barium iodate(V), but also to a measurable esr signal 784 . Tentatively identified by their ultraviolet-visible absorption spectra, the ion IO4 2 -and the radical -I0 4 are believed to be formed as transients during the pulse radiolysis of aqueous periodate 785 .…”

Section: Reactionsmentioning

confidence: 99%