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Creators/Authors contains: "Shapiro, David"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, ACS Applied Nano Materials)
    Free, publicly-accessible full text available April 4, 2026
  2. ; ; ; ; ; ; ; ; ; ; et al (, Journal of Physics: Condensed Matter)
    Abstract In this study, the structure and transport properties of two polymorphs, nanoparticles and nanorods, of the iron(II) triazole [Fe(Htrz)2(trz)](BF4) spin crossover complex were compared. Conductive atomic force microscopy was used to map the electrical conductivity of individual nanoparticles and nanorods. The [Fe(Htrz)2(trz)](BF4) nanorods showed significantly higher conductivity compared to nanoparticles. This difference in electrical conductivity is partially associated to the different Fe–N bond lengths in each of the polymorphs, with an inverse relationship between Fe–N bond length and conductivity. Transport measurements were done on the nanorods for both high spin (at 380 K) and low spin (at 320 K) states under dark and illuminated conditions. The conductance is highest for the low spin state under dark conditions. In illumination, the conductance change is much diminished. 
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  3. ; ; ; ; ; ; ; ; ; ; et al (, Journal of Physics: Condensed Matter)
    Abstract Evidence of chirality was observed at the Fe metal center in Fe(III) spin crossover coordination salts [Fe(qsal)2][Ni(dmit)2] and [Fe(qsal)2](TCNQ)2from x-ray absorption (XAS) spectroscopy at the Fe 2p3/2core threshold. Based on the circularly polarized XAS data, the x-ray natural circular dichroism for [Fe(qsal)2][Ni(dmit)2] and [Fe(qsal)2](TCNQ)2is far stronger than seen for [Fe(qsal)2]Cl suggesting this natural circular dichroism signature is a ligand effect rather than a result of just a loss of octahedral symmetry on the Fe core. The larger the chiral effects in the Fe 2p core to bound XAS, the greater the perturbation of the Fe 2p3/2to 2p1/2spin–orbit splitting seen in the XAS spectra. 
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  4. ; ; ; ; ; ; ; ; (, Journal of Molecular Biology)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, Journal of Physics: Materials)
    Abstract Adding Fe3O4nanoparticles to composites of [Fe(Htrz)2(trz)](BF4) spin-crossover polymer and polyaniline (PANI) drives a phase separation of both and restores the molecular structure and cooperative effects of the spin-crossover polymer without compromising the increased conductivity gained through the addition of PANI. We observe an increased on-off ratio for the DC conductivity owing to an enlarged off state resistivity and a 20 times larger AC conductivity of the on state compared with DC values. The Fe3O4nanoparticles, primarily confined to the [Fe(Htrz)2(trz)](BF4) phase, are ferromagnetically coupled to the local moment of the spin-crossover molecule suggesting the existence of an exchange interaction between both components. 
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  6. ; ; ; ; ; ; ; (, The Journal of Physical Chemistry C)
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  7. ; ; ; ; ; ; (, Ultramicroscopy)
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  8. ; ; ; ; ; ; ; ; ; ; et al (, Cell Reports Physical Science)
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  9. ; ; ; ; ; ; ; ; ; ; et al (, ACS Energy Letters)
    null (Ed.)
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