Abrupt spin crossover in an iron(iii) quinolylsalicylaldimine complex: structural insights and solvent effects

Abstract

The first Fe(III) qsal-X complex exhibiting abrupt complete spin crossover at 228 K with a hysteresis of 8 K, [Fe(qsal-I)2]OTf is reported. Structural studies of the MeOH solvate in the LS and HS state and at the spin transition are described.

Investigation of the Spin Crossover Properties of Three Dinulear Fe(II) Triple Helicates by Variation of the Steric Nature of the Ligand Type

“…In this structure, these "linked" Fe(II) centres were of the same spin-state (see above), suggesting a greater degree of cooperativity between Fe(II) centres in this structure. As has been shown previously, the intermolecular interactions, particularly hydrogen bonding, are a crucial influence on the cooperativity of the spin transition [36,38,39]. This cooperativity may be a factor influencing the more abrupt nature of the spin transition in 2.…”

Abrupt two-step and symmetry breaking spin crossover in an iron(iii) complex: an exceptionally wide [LS–HS] plateau

“…At 300 K, χ M T is 4.07 cm 3 K mol −1 consistent with HS Fe III . 19,21,23 Upon cooling there is a rapid decrease in χ M T to ca. 2.45 cm 3 K mol −1 with the spin transition occurring at T ½↓(1 st step) = 229 K and indicative of 50% of the Fe centres crossing over.…”

Synthesis and characterisation of Fe(III) and Co(III) complexes of thiazole-containing thiosemicarbazone ligands

“…[5][6][7][8] . [9][10][11] Thiosemicarbazonebased ligands have been used to generate interesting complexes with a range of potential applications, however one area that appeals to us is their use in Fe(III) spincrossover (SCO) systems. [12][13][14][15][16][17] Most examples of thiosemicarbazone-based SCO active complexes use simple thiosemicarbazides and salicylaldehyde (SA) derivatives (e.g.…”