Three supramolecular isomers of an Fe–NCS complex and two isomers of an Fe–NCSe complex bridged by 1,2-di(4-pyridyl)ethane have been obtained. 57Fe Mössbauer spectroscopy revealed a drastic change in the QS value by changing the structure and by changing NCS to NCSe. Solid-to-solid transformation was observed, accompanied by a drastic change in the QS value.
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