Discrete Systems Related to Coordination Networks and Metal-Organic Frameworks

Constable, Edwin C.; Housecroft, Catherine E.

doi:10.1016/b978-0-08-102688-5.00041-6

Comprehensive Coordination Chemistry III 2021

DOI: 10.1016/b978-0-08-102688-5.00041-6

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Discrete Systems Related to Coordination Networks and Metal-Organic Frameworks

Edwin C. Constable¹,

Catherine E. Housecroft²

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2023

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“…20−24 The Fe(II) LS state has six paired electrons in the ground states with no interaction with the applied magnetic field and a diamagnetic behavior is usually seen in Fetriazole complexes at LS. 13,14,22,25 While the magnetic properties of Fe-triazole compounds in powder or solutions have been studied widely by magnetometry techniques, 7,8 such as vibrating-sample magnetometry (VSM), superconducting quantum interference device (SQUID), and Mossbauer spectroscopy, their magnetic properties at the individual level have not been explored. There are recent efforts to study Fe-triazole magnetic properties at the individual level by using for example micro-SQUID magnetomtery.…”

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confidence: 99%

Nitrogen-Vacancy Magnetometry of Individual Fe-Triazole Spin Crossover Nanorods

et al. 2023

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[Fe(Htrz)2(trz)](BF4) (Fe-triazole) spin crossover molecules show thermal, electrical, and optical switching between high spin (HS) and low spin (LS) states, making them promising candidates for molecular spintronics. The LS and HS transitions originate from the electronic configurations of Fe(II) and are considered to be diamagnetic and paramagnetic, respectively. The Fe(II) LS state has six paired electrons in the ground states with no interaction with the magnetic field and a diamagnetic behavior is usually observed. While the bulk magnetic properties of Fe-triazole compounds are widely studied by standard magnetometry techniques, their magnetic properties at the individual level are missing. Here we use nitrogen vacancy (NV) based magnetometry to study the magnetic properties of the Fe-triazole LS state of nanoparticle clusters and individual nanorods of size varying from 20 to 1000 nm. Scanning electron microscopy (SEM) and Raman spectroscopy are performed to determine the size of the nanoparticles/nanorods and to confirm their respective spin states. The magnetic field patterns produced by the nanoparticles/nanorods are imaged by NV magnetic microscopy as a function of applied magnetic field (up to 350 mT) and correlated with SEM and Raman. We found that in most of the nanorods the LS state is slightly paramagnetic, possibly originating from the surface oxidation and/or the greater Fe(III) presence along the nanorods’ edges. NV measurements on the Fe-triazole LS state nanoparticle clusters revealed both diamagnetic and paramagnetic behavior. Our results highlight the potential of NV quantum sensors to study the magnetic properties of spin crossover molecules and molecular magnets.

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confidence: 99%

Nitrogen-Vacancy Magnetometry of Individual Fe-Triazole Spin Crossover Nanorods

et al. 2023

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Discrete Systems Related to Coordination Networks and Metal-Organic Frameworks

Cited by 1 publication

References 280 publications

Nitrogen-Vacancy Magnetometry of Individual Fe-Triazole Spin Crossover Nanorods

Nitrogen-Vacancy Magnetometry of Individual Fe-Triazole Spin Crossover Nanorods

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