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 / Cherdantseva E. V.,Starichenko D. V.,Slepukhin P. A.,Ishmetova R. I.,Shvachko Yu. N.,Korolev A. V.,Rusinov G. L.,Ustinov V. V.,Matern A. I.,Charushin V. N. // RUSSIAN CHEMICAL BULLETIN. - 2010. - V. 59, l. 4. - P. 717-723.

ISSN/EISSN:

1066-5285 / нет данных

Type:

Article

Abstract:

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.

Author keywords:

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

DOI:

10.1007/s11172-010-0152-x

Web of Science ID:

ISI:000283302000008

Соавторы в МНС:

Другие поля

Поле	Значение
Month	APR
Publisher	SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013 USA
Language	English
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Multidisciplinary
Author-Email	rusinov@ios.uran.ru
ResearcherID-Numbers	Starichenko, Denis/J-9813-2013 Ustinov, Vladimir/G-7501-2011 Alexander, Korolev/K-3036-2013
ORCID-Numbers	Starichenko, Denis/0000-0001-9481-538X Ustinov, Vladimir/0000-0002-5155-7947 Alexander, Korolev/0000-0002-5104-3997
Funding-Acknowledgement	Russian Foundation for Basic Research {[}05-03-32094-a, 07-03-96112-r\_ural\_a, 07-03-96113-r\_ural\_a]; Presidium of the Russian Academy of Sciences {[}26]; Siberian and Ural Branches of the Russian Academy of Sciences {[}37]; Council on Grants at the President of the Russian Federation {[}NSh-3758.2008.3]
Funding-Text	This work was financially supported by the Russian Foundation for Basic Research (Project Nos 05-03-32094-a, 07-03-96112-r\_ural\_a, and 07-03-96113-r\_ural\_a), the Presidium of the Russian Academy of Sciences (Project No. 26), the Siberian and Ural Branches of the Russian Academy of Sciences (interdisciplinary program, Integration Project No. 37), the Council on Grants at the President of the Russian Federation (Program of State Support of Leading Scientific Schools, Grant NSh-3758.2008.3).
Number-of-Cited-References	12
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	8
Journal-ISO	Russ. Chem. Bull.
Doc-Delivery-Number	668VY