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

F Tuna, FR Lees, GJ Clarkson, Michael Hannon

Research output: Contribution to journalArticle

77 Citations (Scopus)


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 pages14
JournalChemistry: A European Journal
Publication statusPublished - 1 Jan 2004


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