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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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Surface induces different crystal structures in a room temperature switchable spin crossover compound.

Denis Gentili1, Fabiola Liscio2, Nicola Demitri3

  • 1Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy. massimiliano.cavallini@cnr.it.

Dalton Transactions (Cambridge, England : 2003)
|November 18, 2015
PubMed
Summary
This summary is machine-generated.

Surfaces influence spin crossover compound crystal structures. Two polymorphs form with opposite spin transitions, one high-to-low spin and the other low-to-high spin, due to surface-induced water interactions.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Spin crossover (SCO) compounds exhibit distinct high-spin (HS) and low-spin (LS) states.
  • The SCO behavior of [Fe(L)2] (LH: 2-(pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine) is switchable around room temperature.
  • Understanding surface effects on SCO material polymorphism is crucial for device applications.

Purpose of the Study:

  • To investigate the influence of surfaces on the formation of different crystal structures of a room-temperature spin crossover compound.
  • To characterize the distinct spin transition behaviors of surface-induced polymorphs.
  • To elucidate the role of water molecules in mediating surface-induced spin transition inversion.

Main Methods:

  • Thin deposits of [Fe(L)2] were prepared and analyzed.
  • Techniques included polarized optical microscopy, atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and micro Raman spectroscopy.
  • Density Functional Theory (DFT) calculations supported spectral analysis and interpretation of spin inversion.

Main Results:

  • Surfaces induced the formation of two distinct crystal structures (polymorphs) of the [Fe(L)2] SCO compound.
  • One polymorph exhibited a high-spin to low-spin transition upon heating.
  • The second polymorph displayed an irreversible low-spin to high-spin transition, attributed to water molecules forming hydrogen bonds with tetrazolyl moieties.

Conclusions:

  • Surface interactions can control the polymorphism of spin crossover materials.
  • The presence of adsorbed water molecules on crystal surfaces can lead to inverted spin transition behaviors.
  • This study highlights the potential for surface engineering to tune SCO properties.