Optimization of crystal packing in semiconducting spin-crossover materials with fractionally charged TCNQ ^δ- anions (0 < δ < 1).

ABSTRACT: Co-crystallization of the prominent Fe(ii) spin-crossover (SCO) cation, [Fe(3-bpp)₂]²⁺ (3-bpp = 2,6-bis(pyrazol-3-yl)pyridine), with a fractionally charged TCNQ ^δ- radical anion has afforded a hybrid complex [Fe(3-bpp)₂](TCNQ)₃·5MeCN (1·5MeCN, where δ = -0.67). The partially desolvated material shows semiconducting behavior, with the room temperature conductivity σ _RT = 3.1 × 10^-3 S cm^-1, and weak modulation of conducting properties in the region of the spin transition. The complete desolvation, however, results in the loss of hysteretic behavior and a very gradual SCO that spans the temperature range of 200 K. A related complex with integer-charged TCNQ^- anions, [

SUBMITTER: Ungor O 

PROVIDER: S-EPMC8372557 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature