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%2F61989592%3A15310%2F22%3A73615224" target="_blank" >RIV/61989592:15310/22:73615224 - isvavai.cz</a>

Result on the web

<a href="https://pubs.rsc.org/en/content/articlepdf/2022/qi/d1qi01350e" target="_blank" >https://pubs.rsc.org/en/content/articlepdf/2022/qi/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)X-2] and [Co(L2)X-2] (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

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

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

2052-1545

e-ISSN

2052-1553

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