INVESTIGATION OF ISOTOPIC EXCHANGE OF IODINE BETWEEN SODIUM IODIDE AND ETHYL IODIDE IN AN ALCOHOL SOLUTION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000600330639-6
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 30, 2011
• Sequence Number: 639
• Publication Date: August 8, 1950
• Content Type: REPORT

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INFORMATION -FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD !':O.
CENTRAL INTELLIGENCE AGENCY REPORII
CLASSIFICATION SECRET S~~RE~
COUNTRY USSR
SUBJECT Scientific -Isotope chemistry
HOW eriodical
PUBLISHED Thrice-monthly p
WHERE
PUBLISHED Moscow
DATE
PUBLISHED 11 Mar 1950
LANGUAGE
DATE OF
INFORMATION 1949
DATE DIST. ~ Aug '1950
NO. OF PAGES 4
SUPPLEMENT TO
REPORT N0.
THIS IS UNEVALUATED INFORMATION
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Doklady Akademii Nauk SSSR, Vol LY.7CI, No 2, 1950?
INVESTIGATION OF ISOTOPIC EXCHANGE OF IODINE
BETWEEN SODIUM IODIDE AND ETHYL IODIDE IN AN ALCOHOL SOLUTION
M. B. Neyman and R. V. Protsenko
Presented by Acad N?16?Jan 1950
The method for conceninathegcaeeiofcconcentra~jng Ili?epresupposes4the
Szillard and Chalmers (1) The question of the ex-
absence of an exchange reaction between C2H51 and I'.
change between ethyl iodide and Na~ in various solvents 'has been qualitative y
who showed thgt th@ exchange proceeds
studied by a number of researchers (2-5), ~d more rapidly at 100 de-
slowly in alcohol solutions at low temperatures,
green centigrade.
In 1942-43 two investi ations (6, 7) were published in wbich the exchange
betweenminute isotoeeof ~~ ne ~2~hwassusediinathesesinvestigationsatandlfor
The 25- p
that reason the duration of the kinetic experiments was limited to sever
hours.
In this study, a mixture of long-lived radime tsvto be conducted ande lso
used, a fact which permitted more lengthy exp
made it possible to expand the investigation into the field of .low tempera-
tures. The technique of the preparation and extraction of radibacNevyem~isoand
topes of iodine has been described in previous articles (8, 9) Y
other collaborators.
Active sodium iodide was prepared according to the reaction:
Na2S t I2 = 2NaI -0- S
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The liberated sulfur was filtered off, and the NaI containing inactive NaI
was dissolved to form a 0.2 N solution in alcohol. Before initiating the ki-
netic experiment, this solution was mixed with an equal volume of a 0.2 N alco-
hol solution of ethyl iodide. The solutions were first heated or cooled to the
temperature of the experiment.
Therefore, the experiment was conducted with solutions in which ~NaI~ _
L"C2g51 '~ . 0.1 mol per liter. The small flasks containing the soluteions
were placed in a thermostat and the temperature was kept constant.
While the reaction was in progress, samples were taken and rapidly cooled,
after which separation of the mixture was accomplished by shaking it up with
benzene. Then, after separation of the water layer containing dissolved I ions,
precipitation with AgNO was carried out. The ethyl iodide of the benzene
layer wa sA Geiger Mue~lerocounter pasrusedcto investlgateithewpgltprecipitate.
into Ag~
In all of the experiments, a part of the NaI to be mixed~sedeasya confide
was precipitated with AgN03, and the active precipitate of Ag
trol.
Results of the exper4m0enand 80fdegreesncentigradenare givensintthe follow-
peratures of 10, 20, 30, ,
ing table:
Kinetics of Exchange of Iodine between NaI and C2H51 at
Different Temperatures (~ NaI, = CC2H51 7 ? 0.1 mol per liter)
Tem$
in C
Tem
p
in hr
~
C2H2I
Activity
NaI
/
~,I
k.10
Indicator mol
4 liter
second
5
17
265
282
282
10
10
19
244
263
270
0.23
15
20
227
247
249
21
2
1
24
153
201
20 17
59
1
180 _
0.92
24
8
l~0
1 6
30
3
226
228
4
54
1
217
219
213
g
69
139
208
209
10
71
133
204
206
2.15
16
So
60
110
112
20
49
5
5
10~
l04
24
l
~
40
23
223
243
4
2
5
75
1
198
200
..
10
71
81
152
148
12
6
68
1
142
80 5 min.
50
138
188
180
153
10 ~~
78
104
182
182
20 ~~
90
94
184
182
If the reaction of isotopic exchange investigated?in this instance is bi-
molecular, its rate constant can be expressed by the following formula:
REGRET
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~,~R~~
-~'_ In 1 ~ x
k - (afib)t 1-(1 -}- a)c
= b ftaI ]=0.1, formula
In the present case, where a = ~C2H51_/ _
(1) is reduced to the form:
1i.5 1
t lg 1-2c
where c is the total activity of the iodine (equal to the activity of the con-
trol) and x is the activity of the ethyl iodide.
Results of the experiments of this study are depicted on a graph the co-
ordinates of which are 1 and t.
1-2~
Ae conce ns the measurement of the magnitude x~c of isotopic exchange of
CHI and Na~with time, the experimental points after being plotted lie on
s~r~ight lines originating from the 0 point of the graph, which fact verifies
the applicability of formula (2) to the reaction investigated. Values for the
constants of the rate of isotopic exchange, derived from the slopes of the lines
plotted are given in the last column of the above table.
To determine the energy of activation of the exchange reaction investigated
here, the values for the constants were plotted in a graph with the coordinates
lg k and 1,000/T. The points 000 cal/mol aiThislquantityg yrlthinotheolimitshof
may be Pound the value E = 19,
error for the experiments, corresponds with the values for energy of activation
found in the works (6, 7).
If, based on the equation for the constant of the rate of the bimolecular
reaction
No rr RTM1M2 -E RT
k = P- o' 2 e
1000 Ml M2
it is assumed that the value and Pratsenkocarecsubstituted, thentaeplausibleor
k end E determined by Neyman 10'8 cm is obtained.
value fox the effective diameter v- = 3=
The graphs described above are available in the original document in CIA
1. L. Szilla_rd and T. A. Chalmers, Nature, CXICXIV, '-F62, 1934.
2, F. Juliusburger, B. Topley and J. Weiss, Joura.Chem. Phys., III, 437, 1935?
3, D. E. Hull, C. H. Shiflett and S. C. Lind, Journ. Am. Chem. Soc., LVIII,
535, 1936?
4. D. E. Hull, C. H. Shiflett and S. C. Lind, ibid., LVIII, 1822, 1936.
-3-
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10. C. C. Evans and S. Sugden, Journ. Chem. 3oc., 270, 1949.
zJav, 541, 1949
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5. H. A. C. McKay, Nature, CX70QX, 283, 1937?
6. H. Seelig and D. E. Hull, Journ.`Am. Chem. Soc., I,XIV, 940, 1942..
7. H. A. C. McKay, ibid., L7CV, 702, 1943.
8. B. G. Dzantiyev and M. B. Neyman, Radioactive Isoto es of Iodine], Uspeklii
Fizicheskikh Nauk, XXXV, 154, 1948
9. K, B. Zaborenko, M. B. Neymaa, and V. I. Samsonova, ~sotope Exchange of
Iodine Between KI and KIO~ in Water Solutions] Doklady Akademii Nauk SSSR,
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