6533b836fe1ef96bd12a0794
RESEARCH PRODUCT
Spin Crossover Phenomenon in Nanocrystals and Nanoparticles of [Fe(3-Fpy)2M(CN)4] (MII = Ni, Pd, Pt) Two-Dimensional Coordination Polymers
Ashis BhattacharjeeAna B. GasparVadim KsenofontovIshtvan BoldogJosé Antonio RealVíctor MartínezPhilipp Gütlichsubject
Materials scienceGeneral Chemical EngineeringSpin transitionNanoparticleInfrared spectroscopyGeneral ChemistryMagnetic susceptibilityCrystalNuclear magnetic resonanceSpin crossoverMössbauer spectroscopyMaterials ChemistryPhysical chemistryMicroemulsiondescription
The two-dimensional spin crossover (SCO) polymers [Fe(3-Fpy)2M(CN)4] (MII = Ni(1), Pd(2), Pt(3)) were nanostructured in the form of nanocrystals and nanoparticles, and their chemical, structural, and physical characterization was carried out using different experimental methods (powder X-ray diffraction, magnetic susceptibility measurements, Mossbauer and infrared spectroscopy, transmission and scanning electronic microscopy, etc.). Surfactant-free nanocrystals of average dimensions 400 × 400 × 30 nm (1a, 1a*, 2a, 3a) were synthesized from water in oil microemulsions (w/o) while nanoparticles of average size 200 × 100, 100 × 60, and 70 × 30 nm were obtained in poly(vinylpyrrolidone) (PVP) coating polymer (1b−1d, 2b, 2b′, and 3b). The spin crossover process is drastically influenced by the dimensions of the crystal/particle. Nanocrystals of 1−3 exhibit a quasi complete first-order spin transition centered within the interval 200−225 K, while PVP-coated nanoparticles undergo continuous second order spin tra...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-06-28 | Chemistry of Materials |