Synthesis, structures, and magnetic properties of crystals of dinuclear copper(II) and cobalt(II) complexes with 3-(3,5-dimethylpyrazol-1-yl)-6-R-1,2,4,5-tetrazines

被引：2

作者：

Cherdantseva, E. V. ^{[2
]}

Starichenko, D. V. ^{[3
]}

Slepukhin, P. A. ^{[1
]}

Ishmetova, R. I. ^{[1
]}

Shvachko, Yu. N. ^{[3
]}

Korolev, A. V. ^{[3
]}

Rusinov, G. L. ^{[1
]}

Ustinov, V. V. ^{[3
]}

Matern, A. I. ^{[2
]}

Charushin, V. N. ^{[1
]}

机构：

[1] Russian Acad Sci, I Ya Postovskii Inst Organ Synth, Ural Branch, Ekaterinburg 620041, Russia

[2] BN Yeltsin Ural State Tech Univ, Ekaterinburg 620002, Russia

[3] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620041, Russia

来源：

RUSSIAN CHEMICAL BULLETIN | 2010年 / 59卷 / 04期

基金：

俄罗斯基础研究基金会;

关键词：

dinuclear complexes; 3-(3,5-dimethylpyrazol-1-yl)-6-R-1,2,4,5-tetrazines; X-ray analysis; EPR spectroscopy; SQUID magnetometry; spin magnetism;

D O I：

10.1007/s11172-010-0152-x

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Dinuclear complexes of Cu-II with 3-(3,5-dimethylpyrazol-1-yl)-6-(2-hydroxyethylami-no)-1,2,4,5-tetrazine (1) and CoII with 3-(3,5-dimethylpyrazol-1-yl)-6-(piperidin-1-yl)-1,2,4,5- tetrazine (2) were synthesized and structurally characterized, and the magnetic (SQUID) and resonance (EPR) properties of van der Waals crystals based on these complexes were studied. Unusual behavior of the effective magnetic moment mu(eff)(T) is observed at T < 60 K. A nonmonotonic increase in mu eff(?) for 1 (s similar to 6 %) and a 20% reduction of mu eff(?) for 2 have a common origin and are due to the influence of spin-orbital coupling on the character of the splitting between the t2g and eg levels of the central ion. Distortions of the coordination site "switch on" a positive (1) or negative (2) contribution of the orbital magnetic moment near 6 K. Irreversible temperature behavior of mu eff(T) in the heating and cooling regimes in the vicinity of 60 K suggests that the character of structural distortions and the magnetic properties are related to ligand geometry. This factor plays a significant role in crystal engineering of magnetoactive structures with polynitrogen ligands.

引用

页码：717 / 723

页数：7

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