Pentacoordinate cobalt(ii) single ion magnets with pendant alkyl chains: shall we go for chloride or bromide?

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F22%3APU143432" target="_blank" >RIV/00216305:26620/22:PU143432 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1039/D1QI01350E" target="_blank" >http://dx.doi.org/10.1039/D1QI01350E</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/D1QI01350E" target="_blank" >10.1039/D1QI01350E</a>

Result language

angličtina

Original language name

Pentacoordinate cobalt(ii) single ion magnets with pendant alkyl chains: shall we go for chloride or bromide?

Original language description

Four pentacoordinate complexes, 1–4, of the type [Co(L1)X2] and [Co(L2)X2] (where L1 = 2,6-bis(1-octyl-1H-benzimidazol-2-yl)pyridine for 1 and 2, L2 = 2,6-bis(1-dodecyl-1H-benzimidazol-2-yl)-pyridine for 3 and 4; X = Cl− for 1 and 3, X = Br− for 2 and 4) have been synthesized, and their structures have been determined by X-ray analysis. The DC magnetic investigation confirmed the high-spin and anisotropic behavior of the metal centers of the reported compounds, and magnetic data were analyzed with respect to the spin Hamiltonian and the Griffith–Figgis Hamiltonian. CASSCF-NEVPT2 analysis enabled us to identify triaxial magnetic anisotropy for 1 and 2 and axial anisotropy for 3 and 4, and we discuss thoroughly the relationship between geometry and orbital ordering. The g-tensor components of the ground Kramers doublet extracted from EPR spectroscopy are compatible with this prediction of magnetic anisotropy. Simulated FIRMS experimental data of 2, 3 and 4 show very good agreement with theoretical calculations and provide precise values of zero-field splitting. The AC susceptibility measurements confirmed that the reported complexes were field-induced single-ion magnets. The slow relaxation of magnetization in 1 and 2 is mediated through two relaxation channels that are unusually close to each other. On the other hand, complexes 3 and 4 show the single-channel relaxation of magnetization, and their isostructural characteristic allowed us to study the relaxation changes caused solely by the replacement of terminal halido ligands. Finally, a wet lithographic technique has been used to evaluate both the processability of the complexes in solution and the preparation of microstructured films.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2022

Confidentiality

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

Name of the periodical

Inorganic Chemistry Frontiers

ISSN

2052-1553

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

6

Country of publishing house

GB - UNITED KINGDOM

Number of pages

16

Pages from-to

1179-1194

UT code for WoS article

000751923900001

EID of the result in the Scopus database

2-s2.0-85127680981