English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The crystal structures of Ni$X_2$(pyz)$_2$ ($X$ = Cl (\textbf{1}), Br(\textbf{2}), I (\textbf{3}) and NCS (\textbf{4})) were determined at 298~K bysynchrotron X-ray powder diffraction. All four compounds consist oftwo-dimensional (2D) square arrays self-assembled from octahedral NiN$_4$$X_2$units that are bridged by pyz ligands. The 2D layered motifs displayed by\textbf{1}-\textbf{4} are relevant to bifluoride-bridged[Ni(HF$_2$)(pyz)$_2$]$Z$F$_6$ ($Z$ = P, Sb) which also possess the same 2Dlayers. In contrast, terminal $X$ ligands occupy axial positions in\textbf{1}-\textbf{4} and cause a staggering of adjacent layers. Long-rangeantiferromagnetic order occurs below 1.5 (Cl), 1.9 (Br and NCS) and 2.5~K (I)as determined by heat capacity and muon-spin relaxation. The single-ionanisotropy and $g$ factor of \textbf{2}, \textbf{3} and \textbf{4} are measuredby electron spin resonance where no zero--field splitting was found. Themagnetism of \textbf{1}-\textbf{4} crosses a spectrum fromquasi-two-dimensional to three-dimensional antiferromagnetism. An excellentagreement was found between the pulsed-field magnetization, magneticsusceptibility and $T_\textrm{N}$ of \textbf{2} and \textbf{4}. Magnetizationcurves for \textbf{2} and \textbf{4} calculated by quantum Monte Carlosimulation also show excellent agreement with the pulsed-field data. \textbf{3}is characterized as a three-dimensional antiferromagnet with the interlayerinteraction ($J_\perp$) slightly stronger than the interaction within thetwo-dimensional [Ni(pyz)$_2$]$^{2+}$ square planes ($J_\textrm{pyz}$).

Magnetism in a family of $S = 1$ square lattice antiferromagnets Ni$X_2$(pyz)$_2$ ($X = $ Cl, Br, I, NCS; pyz = pyrazine)