Detail publikačního výsledku

Stereochemistry of coordination polyhedra vs. single ion magnetism in penta- and hexacoordinated Co(II) complexes with tridentate rigid ligands

BRACHŇAKOVÁ, B.; MATEJOVÁ, S.; MONCOL, J.; HERCHEL, R.; PAVLIK, J.; MORENO-PINEDA, E.; RUBEN, M.; ŠALITROŠ, I.

Originální název

Stereochemistry of coordination polyhedra vs. single ion magnetism in penta- and hexacoordinated Co(II) complexes with tridentate rigid ligands

Anglický název

Stereochemistry of coordination polyhedra vs. single ion magnetism in penta- and hexacoordinated Co(II) complexes with tridentate rigid ligands

Druh

Článek WoS

Originální abstrakt

A tridentate ligand L (2,6-bis(1-(3,5-di-tert-butylbenzyl)-1H-benzimidazol-2-yl)pyridine) was synthesized and used for the preparation of three pentacoordinated Co(II) complexes of formula [Co(L)X2] (where X = NCS− for 1, X = Cl− for 2 and X = Br− for 3) and one ionic compound 4 ([Co(L)2]Br2·2CH3OH·H2O) containing a hexacoordinated Co(II) centre. Static magnetic data were analysed with respect to the spin (1–3) or the Griffith–Figgis (4) Hamiltonian. Ab initio calculations enable us to identify the positive axial magnetic anisotropy parameter D accompanied by a significant degree of rhombicity in the reported complexes. Also, magneto-structural correlation was outlined for this class of compounds. Moreover, all four compounds exhibit slow relaxation of magnetisation at an applied static magnetic field with either both low- and high-frequency relaxation channels (3) or a single high-frequency relaxation process (1, 2 and 4). The interplay between the stereochemistry of coordination polyhedra, magnetic anisotropy and the relaxation processes was investigated and discussed in detail.

Anglický abstrakt

A tridentate ligand L (2,6-bis(1-(3,5-di-tert-butylbenzyl)-1H-benzimidazol-2-yl)pyridine) was synthesized and used for the preparation of three pentacoordinated Co(II) complexes of formula [Co(L)X2] (where X = NCS− for 1, X = Cl− for 2 and X = Br− for 3) and one ionic compound 4 ([Co(L)2]Br2·2CH3OH·H2O) containing a hexacoordinated Co(II) centre. Static magnetic data were analysed with respect to the spin (1–3) or the Griffith–Figgis (4) Hamiltonian. Ab initio calculations enable us to identify the positive axial magnetic anisotropy parameter D accompanied by a significant degree of rhombicity in the reported complexes. Also, magneto-structural correlation was outlined for this class of compounds. Moreover, all four compounds exhibit slow relaxation of magnetisation at an applied static magnetic field with either both low- and high-frequency relaxation channels (3) or a single high-frequency relaxation process (1, 2 and 4). The interplay between the stereochemistry of coordination polyhedra, magnetic anisotropy and the relaxation processes was investigated and discussed in detail.

Klíčová slova

INDUCED SLOW RELAXATION; TRANSITION-METAL-COMPLEXES; STATE PERTURBATION-THEORY; MOLECULE MAGNET; SPIN-CROSSOVER; ZERO-FIELD; SPECTROSCOPIC PROPERTIES; COBALT(II); ANISOTROPY; MAGNETIZATION

Klíčová slova v angličtině

INDUCED SLOW RELAXATION; TRANSITION-METAL-COMPLEXES; STATE PERTURBATION-THEORY; MOLECULE MAGNET; SPIN-CROSSOVER; ZERO-FIELD; SPECTROSCOPIC PROPERTIES; COBALT(II); ANISOTROPY; MAGNETIZATION

Autoři

BRACHŇAKOVÁ, B.; MATEJOVÁ, S.; MONCOL, J.; HERCHEL, R.; PAVLIK, J.; MORENO-PINEDA, E.; RUBEN, M.; ŠALITROŠ, I.

Rok RIV

2021

Vydáno

01.02.2020

ISSN

1477-9234

Periodikum

DALTON TRANSACTIONS

Svazek

49

Číslo

4

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1249

Strany do

1264

Strany počet

16

URL

https://pubs.rsc.org/en/content/articlelanding/2020/DT/C9DT04592A#!divAbstract

BibTex

@article{BUT163837,
  author="Barbora {Brachňaková} and Simona {Matejová} and Ján {Moncol} and Radovan {Herchel} and Ján {Pavlik} and Eufemio {Moreno-Pineda} and Mario {Ruben} and Ivan {Šalitroš}",
  title="Stereochemistry of coordination polyhedra vs. single ion magnetism in penta- and hexacoordinated Co(II) complexes with tridentate rigid ligands",
  journal="DALTON TRANSACTIONS",
  year="2020",
  volume="49",
  number="4",
  pages="1249--1264",
  doi="10.1039/C9DT04592A",
  issn="1477-9226",
  url="https://pubs.rsc.org/en/content/articlelanding/2020/DT/C9DT04592A#!divAbstract"
}