Publication result detail

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.

Original Title

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

English Title

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

Type

WoS Article

Original Abstract

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.

English abstract

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.

Keywords

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

Key words in English

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

Authors

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

RIV year

2021

Released

01.02.2020

ISBN

1477-9234

Periodical

DALTON TRANSACTIONS

Volume

49

Number

4

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1249

Pages to

1264

Pages count

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"
}