Large magnetic anisotropy of Ni(II) polynuclear complexes confirmed by very unusual HFEPR spectra: relaxation behaviour of six-coordinate Ni(II) dimers

Jacek Sawka; Alina Bieńko; Anna Świtlicka; Mateusz Penkala; Dariusz Bieńko; Cyril Rajnák; Ján Titiš; Roman Boča; Andrew Ozarowski

doi:10.1039/D5DT01264C

Large magnetic anisotropy of Ni(ii) polynuclear complexes confirmed by very unusual HFEPR spectra: relaxation behaviour of six-coordinate Ni(ii) dimers

Jacek Sawka,

^a Alina Bieńko,

*^a Anna Świtlicka,

^b Mateusz Penkala,

^c Dariusz Bieńko,

^d Cyril Rajnák,

^ef Ján Titiš,

^e Roman Boča

^g and Andrew Ozarowski

Author affiliations

* Corresponding authors

^a Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383 Wroclaw, Poland
E-mail: alina.bienko@uwr.edu.pl

^b Department of Crystallography, Institute of Chemistry, University of Silesia, Szkolna St. 9, 40-006 Katowice, Poland

^c Department of Inorganic, Organometallic Chemistry and Catalysis, Institute of Chemistry, University of Silesia, 9 Szkolna St., 40-006 Katowice, Poland

^d Faculty of Chemistry, Wroclaw University of Science and Technology, Wybrzeze Wyspiańskiego 27, Wroclaw 50-370, Poland

^e Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, SK-917 01 Trnava, Slovakia

^f Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, SK-84215 Bratislava, Slovakia

^g Faculty of Health Science, University of Ss. Cyril and Methodius, 917 01 Trnava, Slovakia

^h National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, USA

Abstract

Two Ni(II) complexes containing a 2,6-bis(pyrazol-1-yl)pyridine (bpp) ligand and pseudohalide linkers ([Ni₂(bpp)₂(μ1,1-N₃)₂(N₃)₂]·2H₂O (1) and [Ni(bpp)(dca)(H₂O)]_n·n(dca) (dca – dicaynamide) (2)) show large magnetic anisotropy confirmed by HFEPR spectra (very unusual for 2) with a negative D value. The AC susceptibility reveals a field supported slow magnetic relaxation for 1 with three relaxation channels.

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Article information

DOI: https://doi.org/10.1039/D5DT01264C
Article type: Communication
Submitted: 29 May 2025
Accepted: 28 Jul 2025
First published: 02 Sep 2025

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Dalton Trans., 2025,54, 13421-13425

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Large magnetic anisotropy of Ni(II) polynuclear complexes confirmed by very unusual HFEPR spectra: relaxation behaviour of six-coordinate Ni(II) dimers

J. Sawka, A. Bieńko, A. Świtlicka, M. Penkala, D. Bieńko, C. Rajnák, J. Titiš, R. Boča and A. Ozarowski, Dalton Trans., 2025, 54, 13421 DOI: 10.1039/D5DT01264C

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Large magnetic anisotropy of Ni(ii) polynuclear complexes confirmed by very unusual HFEPR spectra: relaxation behaviour of six-coordinate Ni(ii) dimers

Abstract

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Large magnetic anisotropy of Ni(II) polynuclear complexes confirmed by very unusual HFEPR spectra: relaxation behaviour of six-coordinate Ni(II) dimers

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