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

Anders Lennartson (Institutionen för kemi och kemiteknik, Polymerteknologi) ; P. Southon ; N. F. Sciortino ; C. J. Kepert ; C. Frandsen ; S. Mørup ; S. Piligkos ; C. J. McKenzie
Chemistry - A European Journal (0947-6539). Vol. 21 (2015), 45, p. 16066-16072.
[Artikel, refereegranskad vetenskaplig]

Formation of either a dimetallic compound or a 1D 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} (3Me2CO). On heating 3Me2CO 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虠S=2 behaviour centred at 205K. Non-porous 3 can reversibly absorb one equivalent of acetone per iron centre to regenerate the same crystalline phase of 3Me2CO concurrently reinstating a low-spin state.

Nyckelord: coordination polymers, host-guest systems, iron, sorption, spin crossover

Denna post skapades 2015-11-11. Senast ändrad 2016-03-10.
CPL Pubid: 225620


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Institutionen för kemi och kemiteknik, Polymerteknologi



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