The strong correlations between thermal conductivities and electronic spin states in the crystals of Fe(iii) spin crossover complexes

Abstract

Solids that change their thermal conductivity during a phase transition can be useful in the development of a thermal switch to allow control of heat flow and reduce energy consumption....

Three novel mononuclear 4‐vinylpyridine‐based Fe(III) complexes displaying various spin‐crossover behaviour

“…The selected bond lengths (Å) and bond angles (°) of 1 have been provided in Tables S2 and S3. At 100 K, the Fe1−N and Fe1−O lengths are in the range of 1.958(4)–2.016(4) Å and 1.865(4)–1.868(4) Å, respectively, and their average bond lengths are 1.980 and 1.867 Å. the Fe2−N and Fe2−O lengths are in the range of 1.956(4)–2.022(4) Å and 1.834(4)–1.885(4) Å, respectively, and their average bond lengths are 1.983 and 1.860 Å, respectively, which are in the expected range for Fe(III) complexes at low‐spin states [39,40] …”

“…At 100 K, the Fe1À N and Fe1À O lengths are in the range of 1.958(4)-2.016(4) Å and 1.865(4)-1.868(4) Å, respectively, and their average bond lengths are 1.980 and 1.867 Å. the Fe2À N and Fe2À O lengths are in the range of 1.956(4)-2.022(4) Å and 1.834(4)-1.885(4) Å, respectively, and their average bond lengths are 1.983 and 1.860 Å, respectively, which are in the expected range for Fe(III) complexes at lowspin states. [39,40] The degree of deformation of coordination geometry relative to an octahedron can be estimated using the octahedral distortion parameters Σ and Θ. For an ideal octahedron, the values of Σ and Θ are 0.…”

First crystal structure of an Fe(iii) anionic complex based on a pyruvic acid thiosemicarbazone ligand with Li+: synthesis, features of magnetic behavior and theoretical analysis

“…For ESI and crystallographic data in CIF or other electronic format see DOI: https://doi.org/10.1039/d2dt03630d of d-orbitals, which is necessary to observe the SCO transition in the desired temperature range. [8][9][10][11][12] In addition, iron(III) complexes attract attention due to their relative stability in air, in contrast to iron(II) compounds that are prone to oxidation. 13 In general, there are three types of complexes that can be selected for iron(III) six-coordination compounds: cationic, neutral, and anionic.…”

“…7 A rich chemical diversity of Schiff bases allows one to tune the degree of iron( iii ) ion σ-/π-bonding with the ligand environment in order to change the splitting energy of d-orbitals, which is necessary to observe the SCO transition in the desired temperature range. 8–12 In addition, iron( iii ) complexes attract attention due to their relative stability in air, in contrast to iron( ii ) compounds that are prone to oxidation. 13 In general, there are three types of complexes that can be selected for iron( iii ) six-coordination compounds: cationic, neutral, and anionic.…”