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Separation of palladium(II) and platinum(II) chlorides by means of a guanidine resin
Anulyriru Elscvicr Printed
,lc,u
Cltimicu Publishing in The
Company.
397
Amsterdam
Ncthrrl;mds
SEPARATION OF PALLADIUM(H) AND MEANS OF A GUANIDI’NE RESIN A. GULKO. Dcyurrtwrtr (Rcccivcd
H. FEIGENBAUM v/’ Clrcwrisrrv. 12th Novcmbcr
AND
PLATINUM(I1)
CHLORIDES
BY
G. SCHMUCKLER
T~~c~lrtlir~ti-I.~rtrclItlslilurc~ 01 7idrrrrrkqv.
Htr~/fir (Isrtrcl)
1971)
The chlorocomplexes of palladium(I1) and platinum(I1) are very similar in structure and properties, which makes their separation a difficult problem. Strong and weak base anion-exchangers alike bind both species, and selective elution is also ruled out as a method for separation. It was felt, however, that an anion-exchanger of still weaker basicity than those commercially available could lead to a solution of the problem. Fundamental studies on sulfaguanidine as a ligand for square planar complcxes’ q2 have shown th_at it reacts very well with palladium but does not interact with platinum. It was thertforc decided to incorporate the sulfonyl-guanidinc ligand into a styrene-divinylbenzene copolymer in order to set whether separation could be achieved on such a resin. It was found that a nearly quantitative separation was possible under optimal conditions. EXPERlMENTAL
A pparcit us
Atomic absorption measurements were made with a Perkin-Elmer Model 493 spectrophotometcr. Infrared spectra were recorded on a Perkin-Elmer Model 237 grating spectrophotomcter. tetrachloropalladate, Chlorosulfonic acid, guanidine nitrate, ammonium potassium tetrachloropalladate and potassium tetrachloroplatinate were obtained in the purest available grade from Fluka, A.G. lsopropanol (puriss, Fluka) was dried over calcium hydride. Nitromethane (C.P., Eastman Kodak) and styrene-divinylbenzene (2(x,) copolymer (Ionac Chemical Co.) were also used. Preptrrcrtion of’ the gtranidiw resirt As a preIiminary step, microbeads (10-30 pm) of 2% cross-linked polystyrene were chlorosulfonated with chlorosulfonic acid”. For this purpose, 6 g of the copolymer were mixed for 3 h at room temperature with a mixture of 60 g of chlorosulfonic acid and 120 g of nitromethane. The resulting chlorosulfonated product was filtered and then washed, first with nitromethane in order to remove excess of acid, and then with dry isopropanol to preserve it in its anhydrous form. And.
Chim. Acts.
59 (1972)
398
A. GULKO,
H. FEIGENBAUM,
G. SCHMUCKLER
Since, for the final product, the chlorosulfonated copolymer must react with free guanidine, not with its salt-form, free guanidine was prepa.red as follows. A solution of 9.2 g of metallic sodium in 350 ml of absolute isopropanol was reacted for 4 h at 40” in an inert atmosphereof nitrogen, with 38.2 g of guanidine hydrochloride. Into this alcoholic solution 10 g of chlorosulfonated resin were introduced, and the whole was rotated for 20 h at 40°. After filtering the product was washed, first with isopropano1 and then with water. The yield of the reaction was tested by potentiometric titration with 0.1 M sodium hydroxide. Elemental analysis gave the following results: 43.76’x,C, 4.95’x,H, 13.05’%,N, 17.9(x,0, 12.95’x,S, O’x,halogen, 2’%, residue. Comtructiort oj’distrihution curves A logarithmic curve showing the distribution of palladium chloride between the resin and the solution was obtained by the following method. Portions (100 mg) of the guanidine resin were shaken with 20-ml aliquots of a solution containing 2 mg of palladium (as ammonium tetrachloropalladate) and varying concentrations of chloride ions. The pH of all solutions was adjusted to 2 by means of perchloric acid, and the ionic strengths to 0.5 M with sodium perchlorate. For comparison, a similar logarithmic distribution curve was constructed for a strong base anion-exchange resin, viz. Dowex 1. Separation was effected in small columns of 4 mm diameter. Portions (OS g) of the resin were packed into the column by suction. Owing to the small size of the beads, suction had also to be applied to pass the solution through the resin at a rate of 15 ml h- ‘. The solutions examined contained ammonium tetrachloropalladate at 0.1-l mg ml- ’ and potassium tetrachloroplatinate at 0.1-S mg ml- l, the pH in all cases being adjusted to 2; lo-ml portions of these mixtures were passed through the column and collected in 25-ml volumetric flasks. The effluents were diluted to 25 ml and analyzed by atomic absorption spectrophotometry with platinum and palladium hollow-cathode lamps. The loaded resins were eluted with 3-4 M hydrochloric acid. From each column three 25-ml portions were eluted and analyzed. RESULTS
AND
DISCUSSION
The structure and spectrunr of the guctrticlirze resh The synthesis consists of two stages, viz. chlorosulfonation : 4-C IS03H+
and interaction
SO,C
I +
H,O
(1)
with guanidine : S02CI+
(2’)
where Ejrepresents the polymeric matrix skeleton. Reaction (1) goes to completion, as proven by elemental analysis, which showed a sulfur-to-carbon ratio of 1:9 in the end-product. In Fig. 1 two distinct, sharp and intense peaks are seen, one being of the asymmetric, the other of the symmetric, SO,-stretching vibration (SO2 asym. 1380 Anal.Chirn.
Acta,
59 (1972)
SEPARATION
OF PLATINUM
AND
PALLADIUM
4.0
5.0
2500
2000
399
Microns 2.5 1001
k
y
’
’
”
3.0
3.5
’ “““~“1”“““’
60
. . . ”
7.0
80
100
.‘.‘.r..‘r...‘,‘*a’
120
.““““‘.I
16.0
20 01 4000
3500
3000
1600
1600
Wovenumber
Fig. 1. Infrared
spectrum
of chlorosulfonatcd
1400
1200
1000
800
(cm-‘)
cross-linked
polystyrene.
Microns 25
30 ”
”
3.5 “~“‘~“““““”
4.0
.
.
.
’
~.~‘-~~.‘~.~~ll..l’l’~‘.‘-‘.’
100
120
160
60
20 0
4000
3500
3000
2500
2000
1600 Wavenumber
Fig. 2. Infrared
spectrum
of the guanidine
1600 (cm-’
1400
1200
1000
800
1
resin.
cm-’ and SO2 sym. 1175 cm- ‘). There is no indication of any hydrolysis product in the 3000 cm - 1 region. The yield of reaction (2) is 77% , which can be deduced from the elemental anaIysis of nitrogen and suITur.Thq spectrum of this prsduct is shown in Fig. 2 ; the SO,-stretching vibrations are no longer present, while two new vibrations have appeared, name>~ at 1540 cm_-.’ a~&at 1630 cm- I. These are the sq?rrme&ficarzd asyfnm&hcl;jPra%ons &YiWC-‘r;, coupSebIo’B-X& Q.Those ~3 ‘rhe sfi3011~3 chf ov%eguoups which did not react with guanidine were hydrolyzed to form R-S03Na, as indicated in the SO-stretching vibration region of the spectrum. Mechanism of the interaction of the resin with palladium chloride The guanidine resin is uncharged and does therefore not function as an anionexchanger but absorbs the uncharged species PdCJz. The reacljon seems 50 be as follows :
Anal.
Chim. Acta, 59 (1972)
400
A. GULKO,
H. FEIGENBAUM,
G. SCHMUCKLER
The proposed mechanism was proved to be correct by the elemental analysis of the product (a 1: 2 ratio of Pd :Cl) and by the distribution curves shown in Fig. 3. These latter trace the distribution coefficients of palladium chloride in, respectively, the guanidine exchanger and a strongly basic anion-exchanger, Dowex 1, as functions of the concentration of chloride ions in the solution concerned. It is evident from Fig. 3 that the palladium distribution curve for the guanidine resin drops more steeply than that for the strongly basic anion-exchanger. For example, at a chloride concentration of 5 * lo- 3 M the ratio of the two distribution coefficients-for Dowex 1 and the guanidine resin- is 3, whereas at 1 M chloride the ratio is 80.
11
-3
Fig.
3. Distribution
-1
-2 of
:md in anion-exchanger
palladium as a function Dowex 1 (0.
b
0 log (Cl-1 -.---_.‘*.w
ol’ chloride
concentration
in the guanidinc
resin (A, 0)
The reason for this difference can be explained as follows. With the guanidine resin, as the chloride ion concentration increases, the concentration of PdCI, decreases, and the probability of its being adsorbed on the resin is therefore reduced. In contrast, a similar increase in chloride ion concentration in the presence of Dowex 1 resin, causesan increase in the concentration of (PdC14)2-, which is strongly bound to that resin, and this in turn leads to a corresponding increase in the distribution coefficient. However, competition with the excess of free chloride for the available adsorption sites is strong, and the two opposing effects bring about a net drop in the amount of palladium adsorbed on the resin, although not in so pronounced a manner as in the case of the guanidine resin. The fact that interaction between palladium and the ligand is in a ratio of 1:2, is deduced from the relatively low capacity of the resin and from the requirements for the establishment of tram square planar bonds with the halide complexes of the palladium. ’ With regard to the type of bonding, a crystallographic and spectroscopic Anal. Chbn. Acta,
59 (1972)
SEPARATION
study
OF
showed
PLATINUM
T N
401
PALLADIUM
that the guanidine
SO,-
u0
AND
group
is present
in its imine
formzS5,
-
(1)
q)
2 (3)
in which N (3) is the most basic donor and serves as a good nucleophile for the bonding of PdCl, which, owing to the lack of electrons in its coordination shell, will be bound to two ligands, each containing one such N(3). It would be unreasonable to assume that the palladium could be tied to two nitrogens of one ligand ; geometric difficulties would prevent such interaction.
The results summarized in Table I indicate that when palladium-platinum mixtures of varying ratios were passed through a column of the guanidine resin, good separation between the two similar metals was achieved. Palladium was completely adsorbed, while platinum passed through the column unaffected. Any small quantities of platinum adsorbed together with the palladium could be easily washed out with 0.5 A4 hydrochloric acid. The palladium could be almost quantitatively eluted from the resin with 3-4 M hydrochloric acid. TABLE
1
SBPAIIATION
01: MIXTURE5
CONTAINING
PALLADKJM
AND
PLATINUM
I3Y THE GUANIDINE
HFiIN
NO.
Inititrl ccmcn. in 10 ml (mg) --____-Pd Pt
EfJlltrent concn. iu 25 nd (rng) .___-----Pd Pt --
Eluute corm. in 25 ml HCI” (mg) ._- .___. Pd Pl
1 2 3 4 5 6
10 1.0 1.0 IO 10 1.0
Traces
0.875
None None Traces Traces None
0.900 9.825 48.38 9.375 48.750
9.050 0.712 0.725 9.650 9.675 0.887
’ Elution
in experiments
1.0 1.0 10 50 10 50 l-3
was carried
AT
pH 2
0.050 0.038 0.050 0.925 0.375 0.625
-
out with 3 M HCI, and in experiments
4-6
with 4 M HCI.
SUMMARY
The preparation and properties of a new, weakly basic ion-exchanger containing suitonylguanidinc as the active groups are described. Palladium and platinum chlorides can be quantitativeiy separated by this resin. Under certain conditions platinum does not react with the resin, whereas palladium is adsorbed and can then be eluted with 3 M hydrochloric acid.
On decrit une preparation et les proprittes d’un nouvel echangeur ionique, Egerement basique, contenant sulfonylguanidine comme groupements actifs. Les chlorures de palladium et de platine peuvent Ctre s&parts quantitativement par cette Anal. Chinr. Acta, 59 (1972)
402
A.
GULKO,
H.
FEIGENBAUM,
G.
SCHMUCKLER
r&sine. Dans certaines conditions, le platine ne rCagit pas avec la r&sine, alors que le palladium est adsorb6 et peut Ctre 611.16avec l’acide, chlorhydrique 3 N. ZUSAMMENFASSUNG
Die Herstellung und die Eigenschaften eines neuen, schwach basischen Ionenaustauschers mit Sulfonylguanidin als aktiven Gruppen werden beschrieben. Palladium .und Platin kiinnen als Chloride mit diesem Harz quantitativ getrennt werden. Unter bestimmten Bedingungen reagiert Platin mit dem Harz nicht, wghrend Palladium adsorbiert wird und dann mit 3 M Salzs5ure eluiert werden kann. REFERENCES
.
1 W. F. RI’ITNER, A. GULKO AND G. SCHMUCKLEH, T~&~nru.17 (1970) 807. 2 A. GULKO, W. F. RITTNER. G. RON, A. WE!IS.SMAN AND G. SCHMUCKLBR, J. fnorg. Nucl. Chum.. 33 (1971) 761. 3 H. CERFONTAIN, Mechanistic .4spects in Aromatic Suijbnution und DesuIjtinution, Interscicnce, Nc.w York, 1968, p, 39. 4 N. B. COLTK-IUP. L. H. DALY AND S. E. WI~EULEY, Introduction to fnji-uredund Rumun Spectroscopy. Academic Press, New York, 1964, p. 283. 5 A. GULKO, F. H. HIXBSTBIN,M. KAPON AND G. SCHMUCKLER, Isr. J. Chem., (1971) 138.
Anul. Chim. Ado,
59 (1972)
,lc,u
Cltimicu Publishing in The
Company.
397
Amsterdam
Ncthrrl;mds
SEPARATION OF PALLADIUM(H) AND MEANS OF A GUANIDI’NE RESIN A. GULKO. Dcyurrtwrtr (Rcccivcd
H. FEIGENBAUM v/’ Clrcwrisrrv. 12th Novcmbcr
AND
PLATINUM(I1)
CHLORIDES
BY
G. SCHMUCKLER
T~~c~lrtlir~ti-I.~rtrclItlslilurc~ 01 7idrrrrrkqv.
Htr~/fir (Isrtrcl)
1971)
The chlorocomplexes of palladium(I1) and platinum(I1) are very similar in structure and properties, which makes their separation a difficult problem. Strong and weak base anion-exchangers alike bind both species, and selective elution is also ruled out as a method for separation. It was felt, however, that an anion-exchanger of still weaker basicity than those commercially available could lead to a solution of the problem. Fundamental studies on sulfaguanidine as a ligand for square planar complcxes’ q2 have shown th_at it reacts very well with palladium but does not interact with platinum. It was thertforc decided to incorporate the sulfonyl-guanidinc ligand into a styrene-divinylbenzene copolymer in order to set whether separation could be achieved on such a resin. It was found that a nearly quantitative separation was possible under optimal conditions. EXPERlMENTAL
A pparcit us
Atomic absorption measurements were made with a Perkin-Elmer Model 493 spectrophotometcr. Infrared spectra were recorded on a Perkin-Elmer Model 237 grating spectrophotomcter. tetrachloropalladate, Chlorosulfonic acid, guanidine nitrate, ammonium potassium tetrachloropalladate and potassium tetrachloroplatinate were obtained in the purest available grade from Fluka, A.G. lsopropanol (puriss, Fluka) was dried over calcium hydride. Nitromethane (C.P., Eastman Kodak) and styrene-divinylbenzene (2(x,) copolymer (Ionac Chemical Co.) were also used. Preptrrcrtion of’ the gtranidiw resirt As a preIiminary step, microbeads (10-30 pm) of 2% cross-linked polystyrene were chlorosulfonated with chlorosulfonic acid”. For this purpose, 6 g of the copolymer were mixed for 3 h at room temperature with a mixture of 60 g of chlorosulfonic acid and 120 g of nitromethane. The resulting chlorosulfonated product was filtered and then washed, first with nitromethane in order to remove excess of acid, and then with dry isopropanol to preserve it in its anhydrous form. And.
Chim. Acts.
59 (1972)
398
A. GULKO,
H. FEIGENBAUM,
G. SCHMUCKLER
Since, for the final product, the chlorosulfonated copolymer must react with free guanidine, not with its salt-form, free guanidine was prepa.red as follows. A solution of 9.2 g of metallic sodium in 350 ml of absolute isopropanol was reacted for 4 h at 40” in an inert atmosphereof nitrogen, with 38.2 g of guanidine hydrochloride. Into this alcoholic solution 10 g of chlorosulfonated resin were introduced, and the whole was rotated for 20 h at 40°. After filtering the product was washed, first with isopropano1 and then with water. The yield of the reaction was tested by potentiometric titration with 0.1 M sodium hydroxide. Elemental analysis gave the following results: 43.76’x,C, 4.95’x,H, 13.05’%,N, 17.9(x,0, 12.95’x,S, O’x,halogen, 2’%, residue. Comtructiort oj’distrihution curves A logarithmic curve showing the distribution of palladium chloride between the resin and the solution was obtained by the following method. Portions (100 mg) of the guanidine resin were shaken with 20-ml aliquots of a solution containing 2 mg of palladium (as ammonium tetrachloropalladate) and varying concentrations of chloride ions. The pH of all solutions was adjusted to 2 by means of perchloric acid, and the ionic strengths to 0.5 M with sodium perchlorate. For comparison, a similar logarithmic distribution curve was constructed for a strong base anion-exchange resin, viz. Dowex 1. Separation was effected in small columns of 4 mm diameter. Portions (OS g) of the resin were packed into the column by suction. Owing to the small size of the beads, suction had also to be applied to pass the solution through the resin at a rate of 15 ml h- ‘. The solutions examined contained ammonium tetrachloropalladate at 0.1-l mg ml- ’ and potassium tetrachloroplatinate at 0.1-S mg ml- l, the pH in all cases being adjusted to 2; lo-ml portions of these mixtures were passed through the column and collected in 25-ml volumetric flasks. The effluents were diluted to 25 ml and analyzed by atomic absorption spectrophotometry with platinum and palladium hollow-cathode lamps. The loaded resins were eluted with 3-4 M hydrochloric acid. From each column three 25-ml portions were eluted and analyzed. RESULTS
AND
DISCUSSION
The structure and spectrunr of the guctrticlirze resh The synthesis consists of two stages, viz. chlorosulfonation : 4-C IS03H+
and interaction
SO,C
I +
H,O
(1)
with guanidine : S02CI+
(2’)
where Ejrepresents the polymeric matrix skeleton. Reaction (1) goes to completion, as proven by elemental analysis, which showed a sulfur-to-carbon ratio of 1:9 in the end-product. In Fig. 1 two distinct, sharp and intense peaks are seen, one being of the asymmetric, the other of the symmetric, SO,-stretching vibration (SO2 asym. 1380 Anal.Chirn.
Acta,
59 (1972)
SEPARATION
OF PLATINUM
AND
PALLADIUM
4.0
5.0
2500
2000
399
Microns 2.5 1001
k
y
’
’
”
3.0
3.5
’ “““~“1”“““’
60
. . . ”
7.0
80
100
.‘.‘.r..‘r...‘,‘*a’
120
.““““‘.I
16.0
20 01 4000
3500
3000
1600
1600
Wovenumber
Fig. 1. Infrared
spectrum
of chlorosulfonatcd
1400
1200
1000
800
(cm-‘)
cross-linked
polystyrene.
Microns 25
30 ”
”
3.5 “~“‘~“““““”
4.0
.
.
.
’
~.~‘-~~.‘~.~~ll..l’l’~‘.‘-‘.’
100
120
160
60
20 0
4000
3500
3000
2500
2000
1600 Wavenumber
Fig. 2. Infrared
spectrum
of the guanidine
1600 (cm-’
1400
1200
1000
800
1
resin.
cm-’ and SO2 sym. 1175 cm- ‘). There is no indication of any hydrolysis product in the 3000 cm - 1 region. The yield of reaction (2) is 77% , which can be deduced from the elemental anaIysis of nitrogen and suITur.Thq spectrum of this prsduct is shown in Fig. 2 ; the SO,-stretching vibrations are no longer present, while two new vibrations have appeared, name>~ at 1540 cm_-.’ a~&at 1630 cm- I. These are the sq?rrme&ficarzd asyfnm&hcl;jPra%ons &YiWC-‘r;, coupSebIo’B-X& Q.Those ~3 ‘rhe sfi3011~3 chf ov%eguoups which did not react with guanidine were hydrolyzed to form R-S03Na, as indicated in the SO-stretching vibration region of the spectrum. Mechanism of the interaction of the resin with palladium chloride The guanidine resin is uncharged and does therefore not function as an anionexchanger but absorbs the uncharged species PdCJz. The reacljon seems 50 be as follows :
Anal.
Chim. Acta, 59 (1972)
400
A. GULKO,
H. FEIGENBAUM,
G. SCHMUCKLER
The proposed mechanism was proved to be correct by the elemental analysis of the product (a 1: 2 ratio of Pd :Cl) and by the distribution curves shown in Fig. 3. These latter trace the distribution coefficients of palladium chloride in, respectively, the guanidine exchanger and a strongly basic anion-exchanger, Dowex 1, as functions of the concentration of chloride ions in the solution concerned. It is evident from Fig. 3 that the palladium distribution curve for the guanidine resin drops more steeply than that for the strongly basic anion-exchanger. For example, at a chloride concentration of 5 * lo- 3 M the ratio of the two distribution coefficients-for Dowex 1 and the guanidine resin- is 3, whereas at 1 M chloride the ratio is 80.
11
-3
Fig.
3. Distribution
-1
-2 of
:md in anion-exchanger
palladium as a function Dowex 1 (0.
b
0 log (Cl-1 -.---_.‘*.w
ol’ chloride
concentration
in the guanidinc
resin (A, 0)
The reason for this difference can be explained as follows. With the guanidine resin, as the chloride ion concentration increases, the concentration of PdCI, decreases, and the probability of its being adsorbed on the resin is therefore reduced. In contrast, a similar increase in chloride ion concentration in the presence of Dowex 1 resin, causesan increase in the concentration of (PdC14)2-, which is strongly bound to that resin, and this in turn leads to a corresponding increase in the distribution coefficient. However, competition with the excess of free chloride for the available adsorption sites is strong, and the two opposing effects bring about a net drop in the amount of palladium adsorbed on the resin, although not in so pronounced a manner as in the case of the guanidine resin. The fact that interaction between palladium and the ligand is in a ratio of 1:2, is deduced from the relatively low capacity of the resin and from the requirements for the establishment of tram square planar bonds with the halide complexes of the palladium. ’ With regard to the type of bonding, a crystallographic and spectroscopic Anal. Chbn. Acta,
59 (1972)
SEPARATION
study
OF
showed
PLATINUM
T N
401
PALLADIUM
that the guanidine
SO,-
u0
AND
group
is present
in its imine
formzS5,
-
(1)
q)
2 (3)
in which N (3) is the most basic donor and serves as a good nucleophile for the bonding of PdCl, which, owing to the lack of electrons in its coordination shell, will be bound to two ligands, each containing one such N(3). It would be unreasonable to assume that the palladium could be tied to two nitrogens of one ligand ; geometric difficulties would prevent such interaction.
The results summarized in Table I indicate that when palladium-platinum mixtures of varying ratios were passed through a column of the guanidine resin, good separation between the two similar metals was achieved. Palladium was completely adsorbed, while platinum passed through the column unaffected. Any small quantities of platinum adsorbed together with the palladium could be easily washed out with 0.5 A4 hydrochloric acid. The palladium could be almost quantitatively eluted from the resin with 3-4 M hydrochloric acid. TABLE
1
SBPAIIATION
01: MIXTURE5
CONTAINING
PALLADKJM
AND
PLATINUM
I3Y THE GUANIDINE
HFiIN
NO.
Inititrl ccmcn. in 10 ml (mg) --____-Pd Pt
EfJlltrent concn. iu 25 nd (rng) .___-----Pd Pt --
Eluute corm. in 25 ml HCI” (mg) ._- .___. Pd Pl
1 2 3 4 5 6
10 1.0 1.0 IO 10 1.0
Traces
0.875
None None Traces Traces None
0.900 9.825 48.38 9.375 48.750
9.050 0.712 0.725 9.650 9.675 0.887
’ Elution
in experiments
1.0 1.0 10 50 10 50 l-3
was carried
AT
pH 2
0.050 0.038 0.050 0.925 0.375 0.625
-
out with 3 M HCI, and in experiments
4-6
with 4 M HCI.
SUMMARY
The preparation and properties of a new, weakly basic ion-exchanger containing suitonylguanidinc as the active groups are described. Palladium and platinum chlorides can be quantitativeiy separated by this resin. Under certain conditions platinum does not react with the resin, whereas palladium is adsorbed and can then be eluted with 3 M hydrochloric acid.
On decrit une preparation et les proprittes d’un nouvel echangeur ionique, Egerement basique, contenant sulfonylguanidine comme groupements actifs. Les chlorures de palladium et de platine peuvent Ctre s&parts quantitativement par cette Anal. Chinr. Acta, 59 (1972)
402
A.
GULKO,
H.
FEIGENBAUM,
G.
SCHMUCKLER
r&sine. Dans certaines conditions, le platine ne rCagit pas avec la r&sine, alors que le palladium est adsorb6 et peut Ctre 611.16avec l’acide, chlorhydrique 3 N. ZUSAMMENFASSUNG
Die Herstellung und die Eigenschaften eines neuen, schwach basischen Ionenaustauschers mit Sulfonylguanidin als aktiven Gruppen werden beschrieben. Palladium .und Platin kiinnen als Chloride mit diesem Harz quantitativ getrennt werden. Unter bestimmten Bedingungen reagiert Platin mit dem Harz nicht, wghrend Palladium adsorbiert wird und dann mit 3 M Salzs5ure eluiert werden kann. REFERENCES
.
1 W. F. RI’ITNER, A. GULKO AND G. SCHMUCKLEH, T~&~nru.17 (1970) 807. 2 A. GULKO, W. F. RITTNER. G. RON, A. WE!IS.SMAN AND G. SCHMUCKLBR, J. fnorg. Nucl. Chum.. 33 (1971) 761. 3 H. CERFONTAIN, Mechanistic .4spects in Aromatic Suijbnution und DesuIjtinution, Interscicnce, Nc.w York, 1968, p, 39. 4 N. B. COLTK-IUP. L. H. DALY AND S. E. WI~EULEY, Introduction to fnji-uredund Rumun Spectroscopy. Academic Press, New York, 1964, p. 283. 5 A. GULKO, F. H. HIXBSTBIN,M. KAPON AND G. SCHMUCKLER, Isr. J. Chem., (1971) 138.
Anul. Chim. Ado,
59 (1972)