Publication detail

Polyradical PROXYL/TEMPO Conjugates Connected by Ester/Amide Bridges: Synthesis, Physicochemical Studies, and DFT Calculations

GURSKÁ, M. BREZOVÁ, V. ŠALITROŠ, I. SVORC, L. SPANIK, I. MONCOL, J. PAVLIK, J. SZOLCSANYI, P.

Original Title

Polyradical PROXYL/TEMPO Conjugates Connected by Ester/Amide Bridges: Synthesis, Physicochemical Studies, and DFT Calculations

Type

journal article in Web of Science

Language

English

Original Abstract

: A series of di-/trinitroxide esters and amides featuring PROXYL and/or TEMPO radicals connected with alicyclic bridges were prepared in 61-92 % yields and their properties were analysed by using multiple experimental techniques. The examination of EPR spectra of radicals in organic solvents augmented with DFT calculations brought valuable information on the conformational dynamics and spin exchange mechanisms. Cyclic voltammetry investigations revealed (quasi)reversible electrochemical behaviour of studied nitroxides with their half-wave potentials ranging from -51 to -17 mV. SQUID measurements of selected radicals revealed that the magnetism of di- and trinitroxides is significantly different, since antiferromagnetic coupling in biradicals is notably larger than in triradicals. The single-crystal X-ray analysis of selected biradicals revealed the existence of 3D supramolecular networks of molecules linked through hydrogen-bonding interactions. These polynitroxide radicals can serve as promising bridging or chelating ligands in the synthesis of transition-metal-based molecular magnets.

Keywords

electrochemistry; magnetism; nitroxides; radicals; spectroscopy

Authors

GURSKÁ, M.; BREZOVÁ, V.; ŠALITROŠ, I.; SVORC, L.; SPANIK, I.; MONCOL, J.; PAVLIK, J.; SZOLCSANYI, P.

Released

1. 3. 2021

Publisher

WILEY-V C H VERLAG GMBH

Location

WEINHEIM

ISBN

2192-6506

Periodical

ChemPlusChem

Year of study

86

Number

3

State

Federal Republic of Germany

Pages from

396

Pages to

405

Pages count

10

URL

https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cplu.202000803

BibTex

@article{BUT173118,
  author="GURSKÁ, M. and BREZOVÁ, V. and ŠALITROŠ, I. and SVORC, L. and SPANIK, I. and MONCOL, J. and PAVLIK, J. and SZOLCSANYI, P.",
  title="Polyradical PROXYL/TEMPO Conjugates Connected by Ester/Amide Bridges: Synthesis, Physicochemical Studies, and DFT Calculations",
  journal="ChemPlusChem",
  year="2021",
  volume="86",
  number="3",
  pages="396--405",
  doi="10.1002/cplu.202000803",
  issn="2192-6506",
  url="https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cplu.202000803"
}