Publication detail

Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor

Ghosh, S. Kamilya, S. Das, M. Mehta, S. Boulon, ME. Nemec, I. Rouzieres, M. Herchel, R. Mondal, A.

Original Title

Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor

Type

journal article in Web of Science

Language

English

Original Abstract

The three Co(II) complexes [Co(bbp)(2)][Co(NCS)(4)]center dot 4DMF (1), [Co(bbp)(NCS)2(DMF)]center dot 2DMF (2), and [Co(bbp)(NCS)(2)] (3) have been synthesized and characterized by single-crystal X-ray diffraction, magnetic, and various spectroscopic techniques. Complexes 1 and 3 are obtained by the reaction of Co(NCS) 2 with 2,6-bis(1H-benzo[d]imidazol-2-yl)pyridine (bbp), and complex 1 undergoes a structural transformation to form complex 2. A single-crystal X-ray study revealed that complex 1 is comprised of two Co(II) centers, a cationic octahedral Co(II) unit and an anionic tetrahedral Co(II) unit, while the Co(II) ion is in a distorted-octahedral environment in 2. Moreover, in complex 3, the Co(II) ion is in a distorted-square-pyramidal geometry. The effect of coordination geometry on the magnetic properties was studied by both static and dynamic magnetic measurements. Direct current (dc) magnetic susceptibility measurements showed that all of the Co(II) ions are in high-spin state in these complexes. Alternating current (ac) magnetic susceptibility measurements indicated that complexes 2 and 3 display slow relaxation of magnetization in an external dc magnetic field, while complex 1 displayed no such property. EPR experiments and theoretical calculations were consistent with the above findings.

Keywords

SINGLE-ION MAGNET; BASIS-SETS; SPIN-CROSSOVER; DONOR LIGANDS; ANISOTROPY; RELAXATION; FIELD; VALENCE; CYANIDE; ATOMS

Authors

Ghosh, S.; Kamilya, S.; Das, M.; Mehta, S.; Boulon, ME.; Nemec, I.; Rouzieres, M.; Herchel, R.; Mondal, A.

Released

18. 5. 2020

Publisher

AMER CHEMICAL SOC

Location

WASHINGTON

ISBN

1520-510X

Periodical

Inorganic Chemistry

Year of study

59

Number

10

State

United States of America

Pages from

7067

Pages to

7081

Pages count

15

URL

https://pubs.acs.org/doi/abs/10.1021/acs.inorgchem.0c00538

BibTex

@article{BUT165532,
  author="Ghosh, S. and Kamilya, S. and Das, M. and Mehta, S. and Boulon, ME. and Nemec, I. and Rouzieres, M. and Herchel, R. and Mondal, A.",
  title="Effect of Coordination Geometry on Magnetic Properties in a Series of Cobalt(II) Complexes and Structural Transformation in Mother Liquor",
  journal="Inorganic Chemistry",
  year="2020",
  volume="59",
  number="10",
  pages="7067--7081",
  doi="10.1021/acs.inorgchem.0c00538",
  issn="1520-510X",
  url="https://pubs.acs.org/doi/abs/10.1021/acs.inorgchem.0c00538"
}