Field-induced ferrimagnetic state in a molecule-based magnet consisting of a Co-II ion and a chiral triplet bis(nitroxide) radical / Numata Youhei,Inoue Katsuya,Baranov Nikolai,Kurmoo Mohamedally,Kikuchi Koichi // JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - 2007. - V. 129, l. 32. - P. 9902-9909.

ISSN/EISSN:

0002-7863 / нет данных

Type:

Article

Abstract:

We present the synthesis, crystal structure, and temperature and field dependence of the magnetic properties of a new molecule-based magnet, {[}Co(hfac)(2)]center dot BNO{*} (1), where hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato and BNO{*} is the chiral triplet bis(nitroxide), 1,3-bis(N-tert-butyl-N-oxylamino)-5-\{1'-methyl-1'-{[}2' `-(S)-methylbutoxy]ethyl\}benzene. The presence of enantiomer-pure BNO induces the formation of chiral one-dimensional chains that are packed parallel to each other in the noncentrosymmetric P1 space group. 1 exhibits four magnetic ground states: paramagnetic; antiferromagnetic; forced ferrimagnetic; field-induced metastable ferrimagnetic. In the paramagnetic state (T > 20 K), it presents short-range antiferromagnetic interaction between Co ion and nitroxide radical and has a minimum of chi T-m value at 220 K. The Weiss temperature estimated in the temperature range 220-300 K is found to be -89.9 K. At 20 K (T-N), an antiferromagnetic long-range ordering is established. In the temperature range 4 K < T < 20 K, the isothermal magnetization curve show a spin-flip transition to the forced ferrimagnetic state at around 850 Oe. Below 4 K, this compound enters into a field-induced ferrimagnetic state, which is metastable and stabilized by the Ising character of the Co ion. In the low-temperature phase, the material becomes a very hard magnet with wide hysteresis loop whose coercive field reaches 25 kOe at 2 K. The magnetic phase diagram based on these magnetic data is presented.

Author keywords:

SINGLE-CHAIN MAGNETS; LARGE COERCIVE FIELD; CRYSTAL-STRUCTURES; MN-II; COPPER(II) COMPLEXES; WEAK FERROMAGNETISM; NITROXIDE RADICALS; RATIONAL DESIGN; L-TART; T-C

DOI:

10.1021/ja064828i

Web of Science ID:

ISI:000248708500021

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	AUG 15
Publisher	AMER CHEMICAL SOC
Address	1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Language	English
Keywords-Plus	SINGLE-CHAIN MAGNETS; LARGE COERCIVE FIELD; CRYSTAL-STRUCTURES; MN-II; COPPER(II) COMPLEXES; WEAK FERROMAGNETISM; NITROXIDE RADICALS; RATIONAL DESIGN; L-TART; T-C
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Multidisciplinary
Author-Email	kxi@hiroshima-u.ac.jp
ResearcherID-Numbers	Koichi, Kikuchi/G-9694-2014 Baranov, Nikolai/J-5042-2013 INOUE, Katsuya/E-9221-2010
ORCID-Numbers	Baranov, Nikolai/0000-0002-9720-5314
Number-of-Cited-References	78
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	46
Journal-ISO	J. Am. Chem. Soc.
Doc-Delivery-Number	199PU