Readily prepared metallo-​supramolecular triple helicates designed to exhibit spin-​crossover behaviour

F. Tuna, M.R. Lees, G.J. Clarkson, M.J. Hannon

    Research output: Contribution to journalArticlepeer-review


    New dinuclear supramolecular cylinders have been designed to exhibit spin-crossover behaviour, a form of molecular bistability. This has been achieved within the framework of our imine-based approach to supramolecular architecture by switching from pyridylimine systems to imidazolimines. Spin-crossover behaviour is achieved while retaining the simplicity and ease-of-synthesis of our molecular design. The imidazole groups used also introduce additional NH groups that engage in hydrogen-bonding to anions and solvents. In the case of the iron(II) tetrafluoroborate complex this hydrogen bonding links supramolecular cylinders into an extended two-dimensional array. Consistent with this, a sharper spin-crossover transition is observed for this compound than for the corresponding hexafluorophosphate salt. More subtle anion effects are indicated in the perchlorate salt which gives a two-step spin conversion, thereby displaying tristability.
    Original languageEnglish
    Pages (from-to)5737-5750
    Number of pages13
    JournalChemistry: A European Journal
    Issue number22
    Publication statusPublished - Nov 2004


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