V. N. Losev*, Yu. V. Kudrina*, and A. K. Trofimchuk**
* Kristall Research and Engineering Center, Svobodnyi pr. 79, Krasnoyarsk, 660041 Russia
** Shevchenko National University, Vladimirskaya ul. 64, Kiev, 01033 Ukraine
Received August 24, 2004
Abstract—Characteristic features of the interaction of iridium and rhodium chloride and chlorostannate com-
plexes with N-(2,6-dimethyl-4-methylenetriphenylphosphonium chloride)phenyl-N'-propylthiourea groups
covalently fixed on the silica gel surface were studied. Comparison of the sorption isolation of rhodium and
iridium by silicas with N-(2,6-dimethyl-4-methylenetriphenylphosphonium chloride)phenyl-N'-propylthiourea
and N-allyl-N'-propylthiourea groups has shown that, at room temperature, the reaction proceeds by an anion
exchange mechanism. At higher temperatures or during storage, rearrangement takes place on the sorbent sur-
face, resulting in the migration of the metal ion from the anion exchange group to be coordinated to the sulfur
atom of the thiourea fragment.
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