The spin-transition properties of Fe(III) complexes with hetarylformazan in an ion-exchange polymer: An EPR study / Vishnevskaya G. P.,Frolova E. N.,Ovchinnikova I. V.,Pervova I. G.,Rezinskikh Z. G. // RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A. - 2010. - V. 84, l. 8. - P. 1388-1394.

ISSN/EISSN:

0036-0244 / нет данных

Type:

Article

Abstract:

For the first time, the EPR method was used to reveal and study the special features of spin-transition processes between high-spin and low-spin iron(III) complexes with hetarylformazans immobilized on an ion-exchange polymer. An analysis of completely reversible temperature dependences of EPR line positions, widths, and integral intensities in the spectra of high-spin and low-spin complexes allowed four temperature intervals to be identified. These intervals corresponded to preparative periods of spin-transition processes (450-275 K, intervals I and II), their appearance (275-230 K, interval III), and occurrence (230-100 K, interval IV). Local concentrations and spin exchange frequencies in clusters were estimated. Effects related to high-spin complex EPR signal shifts during temperature changes and to the duration of sample storage were revealed. High-spin complexes were found to be very sensitive to external actions, as distinct from very stable low-spin complexes. Experimental EPR observations obtained for ion-exchange polymer satisfied the concept of the nucleation and growth of domains in the spin-transition process.

Author keywords:

CROSSOVER

DOI:

10.1134/S0036024410080200

Web of Science ID:

ISI:000280242300020

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
Keywords-Plus	CROSSOVER
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	igovchinnikov@gmail.com
Funding-Acknowledgement	Russian Foundation for Basic Research {[}08-02-01348]
Funding-Text	This work was financially supported by the Russian Foundation for Basic Research, project no. 08-02-01348.
Number-of-Cited-References	22
Usage-Count-Since-2013	3
Journal-ISO	Russ. J. Phys. Chem. A
Doc-Delivery-Number	630AG