Abstract
A mononuclear complex of composition [Fe(3-Br-phen)2(NCS)2]·0.5CH3OH which exhibits a gradual, incomplete spin crossover (SCO) in bulk sample (1) was selected to study the effect of alteration of particle size and shape on SCO properties. Thin films (2) were fabricated using spin coating technique on quartz substrates and silicon wafers. Morphology analysis by scanning electron micrographs shows a drastic reduction in particles size and deformation in shape compared to the bulk sample. Nearly spherical particles of 200-500 nm diameter were obtained and further reduction in size down to 50-120 nm were obtained with increase in spin coating speed. A thin film on a quartz substrate was studied by 57Fe Mössbauer spectroscopy in transmission mode which shows only a low-spin signal as opposed to a dominant high-spin signal in bulk sample thus hinting out the effect of texture modification on increasing the ligand field strength.
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