Reversible Guest Binding in a Non-Porous FeII Coordination Polymer Host Toggles Spin Crossover

Anders Lennartson, Peter Southon, Natasha F. Sciortino, Cameron J. Kepert, Cathrine Frandsen, Steen Mørup, Stergios Piligkos, Christine J. McKenzie

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Formation of either a dimetallic compound or a 1 D coordination polymer of adiponitrile adducts of [Fe(bpte)]2+ (bpte=[1,2-bis(pyridin-2-ylmethyl)thio]ethane) can be controlled by the choice of counteranion. The iron(II) atoms of the bis(adiponitrile)-bridged dimeric complex [Fe2(bpte)22-(NC(CH2 )4 CN)2 ](SbF6 )4 (2) are low spin at room temperature, as are those in the polymeric adiponitrile-linked acetone solvate polymer {[Fe(bpte)(μ2-NC(CH2)4CN)]-(BPh4)2⋅Me2CO} (3⋅Me2 CO). On heating 3⋅Me2CO to 80 °C, the acetone is abruptly removed with an accompanying purple to dull lavender colour change corresponding to a conversion to a high-spin compound. Cooling reveals that the desolvate 3 shows hysteretic and abrupt spin crossover (SCO) S=0↔S=2 behaviour centred at 205 K. Non-porous 3 can reversibly absorb one equivalent of acetone per iron centre to regenerate the same crystalline phase of 3⋅Me2CO concurrently reinstating a low-spin state.
Original languageEnglish
JournalChemistry - A European Journal
Volume21
Issue number45
Pages (from-to)16066-16072
Number of pages7
ISSN0947-6539
DOIs
Publication statusPublished - 2015

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