Magnetic anisotropy in pentacoordinate 2,6-bis(arylazanylidene-1-chloromethyl)pyridine cobalt(II) complexes with chlorido co-ligands

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33161068" target="_blank" >RIV/61989592:15310/16:33161068 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0379677916300406" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0379677916300406</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.synthmet.2016.02.014" target="_blank" >10.1016/j.synthmet.2016.02.014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetic anisotropy in pentacoordinate 2,6-bis(arylazanylidene-1-chloromethyl)pyridine cobalt(II) complexes with chlorido co-ligands

Popis výsledku v původním jazyce

Static and dynamic magnetic properties of a series of four pentacoordinate [Co-II(L3A-D)Cl-2] complexes 1-4(1, L3A = N,N'-bis(2,4,6-trimethylphenyl)pyridine-2,6-dicarboximidoyl dichloride; 2, L3B = N,N'-bis(2,6-dimethylphenyl)pyridine-2,6-dicarboximidoyl dichloride; 3, L3C=N,N'-bis(4-chloro-2,6-dimethylphenyl)pyridine-2,6-dicarboximidoyl dichloride; and 4, L3D =N,N'-bis(2,6-diisopropyl)pyridine-2,6-dicarboximidoyl dichloride) were thoroughly studied. Irrespective of the sign of the zero-field splitting parameter D, all the compounds 1-4 showed the uniaxial type of magnetic anisotropy and also slow relaxation of magnetization, hence belong to the class of field-induced single-ion magnets. The values of the D parameter range from large and positive in 1 and 2 (45.8 cm(-1), and 38.4 cm(-1), respectively) to large and negative in 3 and 4 (-43.9 cm(-1), and -41.3 cm(-1), respectively). In the cases of complexes 1-3, a very large rhombicity was revealed (E/D = from 0.24 to 031). Only in compound 4, which possesses large negative axial and practically zero rhombic magnetic anisotropy (D = -41.3 crn(-1), E/D = 0.0), the extraction of spin reversal barrier, U = 22.8 K, from Argand diagram was feasible. The experimental findings were also supported by ab initio multi-reference CASSCF/NEVPT2 calculations. Finally, the magneto-structural correlation of D vs. tau was proposed, showing that the square-pyramidal Co(II) complexes adopt large and negative D values, and moreover, that the sign of D is changed to positive on transition to the chromophore geometries closer to the trigonal bipyramidal arrangement, with a crossing point at tau approximate to 0.29 (C)

Název v anglickém jazyce

Magnetic anisotropy in pentacoordinate 2,6-bis(arylazanylidene-1-chloromethyl)pyridine cobalt(II) complexes with chlorido co-ligands

Popis výsledku anglicky

Static and dynamic magnetic properties of a series of four pentacoordinate [Co-II(L3A-D)Cl-2] complexes 1-4(1, L3A = N,N'-bis(2,4,6-trimethylphenyl)pyridine-2,6-dicarboximidoyl dichloride; 2, L3B = N,N'-bis(2,6-dimethylphenyl)pyridine-2,6-dicarboximidoyl dichloride; 3, L3C=N,N'-bis(4-chloro-2,6-dimethylphenyl)pyridine-2,6-dicarboximidoyl dichloride; and 4, L3D =N,N'-bis(2,6-diisopropyl)pyridine-2,6-dicarboximidoyl dichloride) were thoroughly studied. Irrespective of the sign of the zero-field splitting parameter D, all the compounds 1-4 showed the uniaxial type of magnetic anisotropy and also slow relaxation of magnetization, hence belong to the class of field-induced single-ion magnets. The values of the D parameter range from large and positive in 1 and 2 (45.8 cm(-1), and 38.4 cm(-1), respectively) to large and negative in 3 and 4 (-43.9 cm(-1), and -41.3 cm(-1), respectively). In the cases of complexes 1-3, a very large rhombicity was revealed (E/D = from 0.24 to 031). Only in compound 4, which possesses large negative axial and practically zero rhombic magnetic anisotropy (D = -41.3 crn(-1), E/D = 0.0), the extraction of spin reversal barrier, U = 22.8 K, from Argand diagram was feasible. The experimental findings were also supported by ab initio multi-reference CASSCF/NEVPT2 calculations. Finally, the magneto-structural correlation of D vs. tau was proposed, showing that the square-pyramidal Co(II) complexes adopt large and negative D values, and moreover, that the sign of D is changed to positive on transition to the chromophore geometries closer to the trigonal bipyramidal arrangement, with a crossing point at tau approximate to 0.29 (C)

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Synthetic Metals

ISSN

0379-6779

e-ISSN

—

Svazek periodika

215

Číslo periodika v rámci svazku

MAY

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

6

Strana od-do

158-163

Kód UT WoS článku

000376839900023

EID výsledku v databázi Scopus

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