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Reverse micelle synthesis and downsizing effects in iron(iii) spin crossover materials
Sharon E Lazaro1, Phimphaka Harding2, Upsorn Boonyang3
1Functional Inorganic Materials Laboratory, Department of Chemistry, College of Science, Central Luzon State University Science City of Munoz Nueva Ecija 3120 Philippines.
None:
We report the reverse micelle synthesis, structural characterisation and magnetic properties of iron(iii) spin crossover (SCO) nanomaterials based on [Fe(qsal)2]NO3, [Fe(qsal-I)2]OTf and [Fe(qsal-I)2]NTf2 using sodium dioctylsulfosuccinate (NaAOT) and hexane. The synthesis and characterization of a new complex, [Fe(qsal)2]NO3·EtOH is also reported. Systematic variation of micellar conditions including surfactant content in the polar and organic phases, reaction time, and solvent choice enabled the controlled formation of parallelogram, plate-like and rod-like shapes for [Fe(qsal)2]NO3, [Fe(qsal-I)2]OTf and [Fe(qsal-I)2]NTf2, respectively, as confirmed by FESEM. Magnetic studies reveal abrupt spin crossover with a narrower hysteresis width compared to the bulk materials. Nanomaterials of [Fe(qsal-I)2]OTf exhibit a 4 K hysteresis (T 1/2↑ = 231 K and T 1/2↓ = 227 K) while those of [Fe(qsal-I)2]NTf2 display a 27 K hysteresis (T 1/2↑ = 275 K and T 1/2↓ = 248 K) comparable to the bulk. The results demonstrate that reverse micelle methods can reliably produce iron(iii) SCO nanomaterials, advancing their potential for integration into functional devices.
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