Counterion Effect on the Spin-Transition Properties of the Cation [Fe(btzx)3]2+ (btzx = m-Xylylenebis(tetrazole))

被引：63

作者：

Quesada, Manuel ^{[1
]}

Prins, Ferry ^{[1
]}

Bill, Eckhard ^{[2
]}

Kooijman, Huub ^{[3
]}

Gamez, Patrick ^{[1
]}

Roubeau, Olivier ^{[4
]}

Spek, Anthony L. ^{[3
]}

Haasnoot, Jaap G. ^{[1
]}

Reedijk, Jan ^{[1
]}

机构：

[1] Leiden Univ, Gorlaeus Labs, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands

[2] Max Planck Inst Bioanorgan Chem, D-45470 Mulheim An Der Ruhr, Germany

[3] Univ Utrecht, Bijvoet Ctr Bimol Res Crystal & Struct Chem, NL-3584 CH Utrecht, Netherlands

[4] Univ Bordeaux 1, Ctr Rech Paul Pascal, CNRS, F-33600 Pessac, France

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2008年 / 14卷 / 28期

关键词：

anions; bis(tetrazole); iron; polymers; spin crossover;

D O I：

10.1002/chem.200800990

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The influence of the counter-anion on the structure and the spin-transition properties of original ID bis(tetrazole) Fe-II systems, namely [Fe(btzx)(3)]X-2 (X=PF6- (1), CF3SO3- (2) and ClO4- (3); btzx-m-xylylene-bis(tetrazole)) is studied. The X-ray crystal structures of compounds 1 and 2 are described in detail. These structures present a solvent molecule encapsulated within pockets formed by btzx ligands along the ID coordination chains. Compound 2 is shown to be the first structurally characterised alternating HS-LS 1D spin-transition system (HS high spin, LS-low spin). The magnetic susceptibility measurements of all three compounds are compared. The degree of completion and the transition temperature are both drastically influenced by the counterion used, while surprisingly, the cooperative nature of the transition is not affected by the choice of counterion. Compounds 1 and 2 are further studied by Mossbauer spectroscopy and their distinct LIESST properties are compared.

引用

页码：8486 / 8499

页数：14

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