Synthesis, structure and magnetic properties of mono-, dinuclear and polymeric compounds of transition metals with 4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole

Martín-Ramos, Pablo; Silva, Manuela Ramos; Silva, Joana de A. e; Martins, Nuno; Yuste-Vivas, Consuelo; Silva, Pedro S. Pereira da; Sobral, Abílio J.F.N.; Pereira, Laura C. J.

doi:10.1016/j.molstruc.2015.12.024

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…1 One of these derivatives, 4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole (abpt), is the potential multitopic ligand that has been the subject of coordination chemistry research since the middle of the 1980s. 2 Due to the variety of a coordination chemistry that this ligand exhibits 3 and the interesting magnetic properties of the associated transition metal complexes, such as spin crossover, 4 or molecular magnetism, 5 coordination chemists are very interested in substituted 1,2,4-triazoles.…”

Section: Introductionmentioning

confidence: 99%

Influence of the phonon-bottleneck effect and low-energy vibrational modes on the slow spin-phonon relaxation in Kramers-ions-based Cu(ii) and Co(ii) complexes with 4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole and dicyanamide

Potočňák,

Bukrynov,

Kliuikov

et al. 2024

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Influence of the phonon-bottleneck effect and low-energy vibrational modes on the slow spin-phonon relaxation in Kramers-ions-based Cu(ii) and Co(ii) complexes with 4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole and dicyanamide

Potočňák,

Bukrynov,

Kliuikov

et al. 2024

Dalton Trans.

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Proving ligand structure-reactivity correlation on multinuclear copper electrocatalysts supported on carbon black for the oxygen reduction reaction

Venegas

Muñoz‐Becerra

Juillard

et al. 2022

Electrochimica Acta

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A Known Iron(II) Complex in Different Nanosized Particles: Variable-Temperature Raman Study of Its Spin-Crossover Behavior

et al. 2019

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The spin-crossover (SCO) polymorph B (complex 1) of the known compound [FeII{N(CN)2}2(abpt)2], where abpt is 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole, has been prepared in three different particle sizes averaging ∼300 (sample 1a), ∼80 (sample 1b), and ∼20 nm (sample 1c). Two independent octahedral molecules possessing Fe1 and Fe2 were found to be present in the crystal of B. Magnetostructural relationships had established that at room temperature both FeII sites are in the high-spin state (HS-HS), whereas a decrease in the temperature to 90 K induces the complete high-spin to low-spin conversion of the Fe1 site, with Fe2 remaining in the high-spin state (LS-HS). The three samples have been characterized by elemental analyses, ATR spectra, solution UV/vis spectra (to exclude resonance Raman effects) and powder X-ray diffraction patterns, while their morphological characteristics have been examined by scanning electron microscopy (SEM). The SCO behavior of the originally prepared sample 1a has been monitored in detail by variable-temperature Raman studies in the 300–80 K range using mainly low-frequency ν(Fe–N) and δ(NFeN) modes and the ν(CN) mode of the axial dicyanamido groups as spin-sensitive vibrations. The new peaks that appear in the low-temperature Raman spectra of the LS-HS form of the complex are reproduced in the calculated spectrum of the LS state of [FeII{N(CN)2}2(abpt)2]. The influence of the average particle size on the SCO properties of 1 has also been studied by variable-temperature Raman spectra. The studies indicate that, during the HS-HS → LS-HS transition, the latter form of the complex appears at higher temperatures for the smaller particles; the T 1/2 shift accomplished by manipulating the particle size within a range of roughly 1 order of magnitude (300–20 nm) may be as high as ∼30 K. The SCO features of 1, as deduced from the Raman study, are in excellent agreement with those derived from a traditional variable-temperature magnetic susceptibility study, indicating the utility of the former.

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Synthesis, structure and magnetic properties of mono-, dinuclear and polymeric compounds of transition metals with 4-amino-3,5-di-2-pyridyl-4H-1,2,4-triazole

Cited by 4 publications

References 21 publications

Influence of the phonon-bottleneck effect and low-energy vibrational modes on the slow spin-phonon relaxation in Kramers-ions-based Cu(ii) and Co(ii) complexes with 4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole and dicyanamide

Influence of the phonon-bottleneck effect and low-energy vibrational modes on the slow spin-phonon relaxation in Kramers-ions-based Cu(ii) and Co(ii) complexes with 4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole and dicyanamide

Proving ligand structure-reactivity correlation on multinuclear copper electrocatalysts supported on carbon black for the oxygen reduction reaction

A Known Iron(II) Complex in Different Nanosized Particles: Variable-Temperature Raman Study of Its Spin-Crossover Behavior

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