Spin-Crossover
Modification through Selective CO<sub>2</sub> Sorption
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Abstract
We
present a spin-crossover Fe<sup>II</sup> coordination polymer
with no permanent channels that selectively sorbs CO<sub>2</sub> over
N<sub>2</sub>. The one-dimensional chains display internal voids of
∼9 Å diameter, each being capable to accept one molecule
of CO<sub>2</sub> at 1 bar and 273 K. X-ray diffraction provides direct
structural evidence of the location of the gas molecules and reveals
the formation of OCO(δ<sup>–</sup>)···π
interactions. This physisorption modifies the spin transition, producing
a 9 K increase in <i>T</i><sub>1/2</sub>