We study intramolecular electron transfer in the single-molecule magnetic complex [MnO(OCR) (HO)] for R = -H, -CH, -CHCl, -CH, and -CHF ligands as a mechanism for switching of the molecular dipole moment. Energetics is obtained using the density functional theory (DFT) with onsite Coulomb energy correction (DFT + ). Lattice distortions are found to be critical for localizing an extra electron on one of the easy sites on the outer ring in which localized states can be stabilized.
View Article and Find Full Text PDFA mononuclear complex [Fe(Buqsal)] has been obtained by a reaction between an Fe(II) precursor salt and a tridentate ligand 2,4-di(-butyl)-6-((quinoline-8-ylimino)methyl)phenol (BuqsalH) in the presence of triethylamine. The complex exhibits a hysteretic spin transition at 117 K upon cooling and 129 K upon warming, as well as light-induced excited spin-state trapping at lower temperatures. Although the strongly cooperative spin transition suggests substantial intermolecular interactions, the complex is readily sublimable, as evidenced by the growth of its single crystals by sublimation at 573 → 373 K and ∼10 mbar.
View Article and Find Full Text PDFWe propose a chelation-assisted assembly of multidentate CNs into metal-organic nanoparticles (MONs). Multidentate CNs functionalized with coordination sites participate equally as organic linkers in MON construction, which is driven by chelation between metal ions and coordination sites. MONs assembled from Au nanoparticles display particle number- and size-dependent optical properties.
View Article and Find Full Text PDFUnderstanding the coexistence, competition and/or cooperation between superconductivity and charge density waves (CDWs) in the transition metal dichalcogenides (TMDs) is an elusive goal which, when realized, promises to reveal fundamental information on this important class of materials. Here, we use four-terminal current-voltage measurements to study the Van der Waals interface between freshly exfoliated flakes of the high-T superconductor, Bi-2212, and the CDW-dominated TMD layered material, 1T-TaS. For highly transparent barriers, there is a pronounced Andreev reflection feature providing evidence for proximity-induced high-T superconductivity in 1T-TaS with a surprisingly large energy gap (~20 meV) equal to half that of intrinsic Bi-2212 (~40 meV).
View Article and Find Full Text PDFA facile synthesis of 3-6 nm, water dispersible, near-infrared (NIR) emitting, quantum dots (QDs) magnetically doped with Fe is presented. Doping of alloyed CdTeS nanocrystals with Fe was achieved using a simple hydrothermal method. The magnetic quantum dots (MQDs) were capped with NAcetyl-Cysteine (NAC) ligands, containing thiol and carboxylic acid functional groups to provide stable aqueous dispersion.
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