Reversible Guest Binding in a Non-Porous FeII Coordination Polymer Host Toggles Spin Crossover
Journal article, 2015

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.

sorption

coordination polymers

iron

spin crossover

host-guest systems

Author

Anders Lennartsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Polymer Technology

P. Southon

The University of Sydney

N. F. Sciortino

The University of Sydney

C. J. Kepert

The University of Sydney

C. Frandsen

Technical University of Denmark (DTU)

S. Mørup

Technical University of Denmark (DTU)

S. Piligkos

University of Copenhagen

C. J. McKenzie

University of Southern Denmark

Chemistry - A European Journal

0947-6539 (ISSN) 1521-3765 (eISSN)

Vol. 21 45 16066-16072

Subject Categories

Polymer Technologies

DOI

10.1002/chem.201502547

More information

Latest update

9/6/2018 1