The flexibility of long chain substituents influences spin-crossover in isomorphous lipid bilayer crystals

Chem Commun (Camb). 2021 Apr 22;57(33):4039-4042. doi: 10.1039/d1cc01073e.

Abstract

[Fe(bpp)2][BF4]2 (bpp = 2,6-di{pyrazol-1-yl}pyridine) derivatives with a bent geometry of hexadec-1-ynyl or hexadecyl pyrazole substituents are isomorphous, and high-spin at room temperature. However, only the latter compound undergoes an abrupt, stepwise spin-transition on cooling. This may reflect the different conformational flexibilities of their long chain substituents.

MeSH terms

  • Alkanes / chemistry*
  • Coordination Complexes / chemistry*
  • Crystallography, X-Ray
  • Ferrous Compounds / chemistry*
  • Ligands
  • Lipid Bilayers / chemistry*
  • Models, Molecular
  • Phase Transition
  • Pyrazoles / chemistry*
  • Pyridines / chemistry*
  • Structure-Activity Relationship
  • Transition Temperature

Substances

  • 2,6-di(1H-pyrazol-3-yl)pyridine
  • Alkanes
  • Coordination Complexes
  • Ferrous Compounds
  • Ligands
  • Lipid Bilayers
  • Pyrazoles
  • Pyridines
  • pyrazole
  • n-hexadecane
  • pyridine