Issue 40, 2024

Substituent effects on spin-crossover Fe(ii)N4O2 pyrenylhydrazone complexes

Abstract

Multifunctional magnetic materials have broad application prospects in molecular switches and information storage. In this study, four mononuclear Fe(II) complexes are synthesized using a series of pyrenylhydrazone ligands HL1–4. Two deprotonated ligands are coordinated to the iron(II) ions in an enolic form, leading to neutral complexes FeII(Lx)2·xsol with a FeIIN4O2 octahedral coordination environment. Magnetic measurements suggest that complex Fe(L1)2·2ACE (1·2ACE, ACE = acetone) is mainly low spin below 300 K and complex Fe(L3)2·ACE (3·ACE) is high spin, whereas complexes Fe(L2)2 (2) and Fe(L4)2·6H2O (4·6H2O) exhibit gradual spin crossover behavior. The spin states of complexes 1–4 are confirmed by single-crystal X-ray diffraction analysis. The substituent effect on the magnetic properties of the complexes is significant in this system. Temperature-dependent fluorescence emission spectra show the coexistence but no coupling effect of spin crossover and fluorescence for complexes 2 and 4·6H2O.

Graphical abstract: Substituent effects on spin-crossover Fe(ii)N4O2 pyrenylhydrazone complexes

Supplementary files

Article information

Article type
Paper
Submitted
27 Mar 2024
Accepted
17 Jul 2024
First published
27 Jul 2024

Dalton Trans., 2024,53, 16592-16597

Substituent effects on spin-crossover Fe(II)N4O2 pyrenylhydrazone complexes

X. Wang, N. Zhang and H. Kou, Dalton Trans., 2024, 53, 16592 DOI: 10.1039/D4DT00904E

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