Publication detail

Magnetic-field-tuned phase transition of a molecular material from the isolated-spin to the coupled-spin regime

SANTANA, V. CUNHA, B. PLUTÍN, A. SILVEIRA, R. CASTELLANO, E. BATISTA, A. CALVO, R. NASCIMENTO, O.

Original Title

Magnetic-field-tuned phase transition of a molecular material from the isolated-spin to the coupled-spin regime

Type

journal article in Web of Science

Language

English

Original Abstract

We report the preparation, X-ray structure, chemical properties, and electron paramagnetic resonance (EPR) studies at Q and X-bands and temperature (mainly) T = 293 K of powder and oriented single crystal samples of the new compound [Cu(N0 ,N0-dimethyl-N0-benzoylthiourea)(2,20-bipyridine)Cl], called CuBMB. The EPR spectra of single crystal samples at the Q-band display abrupt merging and narrowing of the peaks corresponding to two rotated copper sites as a function of magnetic field (B0) orientation. This behaviour indicates a quantum transition from an array of quasi-isolated spins to a quantumentangled spin array associated with exchange narrowing processes and produced by weak intermolecular exchange interactions Ji between neighbour copper spins. This transition occurs when the magnitudes of the anisotropic contributions to the Zeeman couplings, tuned with the direction of B0, approach these |Ji| and produce level crossings. The exchange couplings between neighbour spins are estimated from the angular variation of the single crystal EPR results at the Q-band. We analyse the quantum behaviour and phase transitions of the spin system and discuss the magnitudes of the exchange couplings in terms of the structure of the chemical paths connecting Cu neighbours. The single crystal data at the Q-band indicates an uncommon ground electronic state of CuII which is discussed and compared with the results of DFT calculations. The spectrum of polycrystalline (powder) samples at the Q-band is a sum of contributions of microcrystals in each phase, and the fraction F of the entangled phase depends on the microwave frequency. The X-band spectrum is compatible with the Q-band results, but does not display a transition, and the spin system is in the quantum-entangled phase for all field orientations. This behaviour is further studied with a simple geometric model giving basic predictions. The crystal structure of CuBMB is monoclinic, space group P21/n, with a = 11.9790(3) Å, b = 14.0236(5) Å, c = 12.1193(3) Å, b = 104.952(2)1 and Z = 4, and the copper ions are equatorially bonded to the benzoylthiourea and bipyridine ligands in a heavily distorted square pyramidal structure.

Keywords

ELECTRON-PARAMAGNETIC-RESONANCE; WEAK EXCHANGE INTERACTIONS; PI-PI STACKING; SINGLE-CRYSTAL; SUPEREXCHANGE INTERACTION; ANTIMICROBIAL ACTIVITY; COPPER(II) COMPOUNDS; CO(III) COMPLEXES; UNPAIRED SPINS; MODEL SYSTEM

Authors

SANTANA, V.; CUNHA, B.; PLUTÍN, A.; SILVEIRA, R.; CASTELLANO, E.; BATISTA, A.; CALVO, R.; NASCIMENTO, O.

Released

28. 2. 2019

ISBN

1463-9084

Periodical

Physical Chemistry Chemical Physics

Year of study

21

Number

8

State

United Kingdom of Great Britain and Northern Ireland

Pages from

4394

Pages to

4407

Pages count

14

URL

https://pubs.rsc.org/en/content/articlelanding/2019/cp/c8cp06719h#!divAbstract

BibTex

@article{BUT155496,
  author="Vinicius Tadeu {Santana} and Beatriz N. {Cunha} and Ana M. {Plutín} and Rafael G. {Silveira} and Eduardo E. {Castellano} and Alzir A. {Batista} and Rafael {Calvo} and Otaciro R. {Nascimento}",
  title="Magnetic-field-tuned phase transition of a molecular material from the isolated-spin to the coupled-spin regime",
  journal="Physical Chemistry Chemical Physics",
  year="2019",
  volume="21",
  number="8",
  pages="4394--4407",
  doi="10.1039/c8cp06719h",
  issn="1463-9084",
  url="https://pubs.rsc.org/en/content/articlelanding/2019/cp/c8cp06719h#!divAbstract"
}