Spin transition in iron(II) polymeric complexes and their structure at equilibrium and metastable spin states

Citation
Sb. Erenburg et al., Spin transition in iron(II) polymeric complexes and their structure at equilibrium and metastable spin states, NUCL INST A, 448(1-2), 2000, pp. 351-357
Citations number
17
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
ISSN journal
01689002 → ACNP
Volume
448
Issue
1-2
Year of publication
2000
Pages
351 - 357
Database
ISI
SICI code
0168-9002(20000621)448:1-2<351:STIIPC>2.0.ZU;2-B
Abstract
Changes in the electronic and spatial structure of polymeric Fe(II) complex es with 1,2,4-triazoles and various anions upon spin transition was studied using EXAFS and XANES spectroscopy. Spin transition and structural changes were induced by the change of temperature or the action of light. In all c omplexes, the spin transition is accompanied by drastic changes in the loca l environment of Fe atoms. The existence of long-life optically excited met astable HS states was revealed for the Fe(atrz)(3)(ClO4)(2) at 4.2 K. It wa s established that the changes in structure of polymeric complex under the action of light at 4.2 K differ from those in the thermally induced spin tr ansition. Such type of differences are determined by mutual influence of ne ighboring Fe atoms in high and low spin states in polymeric chains. (C) 200 0 Elsevier Science B.V. All rights reserved.