Thermally and optically induced spin transition effect on the structure of iron(II) polymeric complexes

被引：21

作者：

Erenburg, SB ^{[1
]}

Bausk, NV ^{[1
]}

Lavrenova, LG ^{[1
]}

Mazalov, LN ^{[1
]}

机构：

[1] SB RAS, Inst Inorgan Chem, Novosibirsk 630090, Russia

来源：

JOURNAL OF SYNCHROTRON RADIATION | 1999年 / 6卷

关键词：

X-ray absorption; structure of polymeric complexes; molecular magnets;

D O I：

10.1107/S0909049598017300

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Polymeric iron(II) complexes of the composition Fe(atrz)(3)A(2), where atrz = 4-amino-1,2,4-triazole, A = anions, have been synthesized and characterized. The compounds exhibit an abrupt thermally driven spin transition (S=0 - S=2) at temperatures varying from 175 K to 400 K depend on composition. XAFS measurements were performed at the VEPP-3 storage ring at the Budker Institute of Nuclear Physics in Novosibirsk. In all studied compounds the Fe-N and Fe-C interatomic distances increase upon the thermally induced transition to the high spin (HS) state by amounts from 0.12 Angstrom to 0.24 Angstrom. The existence of long-life optically excited metastable HS states was established for the Fe(atrz)(3)(ClO4)(2) at 4.2 K. The changes in structure upon the transition to a metastable HS state differ from those in the thermally induced spin transition.

引用

页码：576 / 578

页数：3

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