Reversible Guest Binding in a Non‐Porous FeII Coordination Polymer Host Toggles Spin Crossover |
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| Authors: | Dr Anders Lennartson Dr Peter Southon Dr Natasha F Sciortino Prof Cameron J Kepert Prof Cathrine Frandsen Prof Steen Mørup Dr Stergios Piligkos Prof Christine J McKenzie |
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| Institution: | 1. Current address: Department of Chemistry and Chemical Engineering, Chalmers Univeristy of Technology, 41296 Gothenburg (Sweden);2. Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M (Denmark);3. School of Chemistry, The University of Sydney, NSW 2006, Sydney (Australia);4. Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby (Denmark);5. Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark) |
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| 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)2(μ2‐(NC(CH2)4CN)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? Me2CO). 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. |
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| Keywords: | coordination polymers host– guest systems iron sorption spin crossover |
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