Abstract
A 2D coordination polymer can exchange guest species from liquid sorption, with accompanying visible colour changes.
Highlights
Stimuli responsive materials have attracted attention for use in a wide array of potential applications including catalysis, drug delivery, gas storage, separation and sensing
The pink crystals obtained solvothermally were found to be a 2D coordination polymer comprised of cobaltIJIII), trimesic acid and N,N-dimethylformamide (DMF)
Compound 1, {[CoIJbtc)IJDMF)2]·xDMF}n, is a coordination polymer in which 2D honeycomb layers pack in parallel with interdigitating coordinated DMF moieties
Summary
Porosity: conventional porosity, porosity “without pores” and virtual porosity.[12]. The inclusion and exchange of guest molecules may induce changes in the host framework.[13–15] In some cases these changes can result in a visible colour change, a phenomenon known as solvatochromism.[16]. The inclusion and exchange of guest molecules may induce changes in the host framework.[13–15]. Depending on the flexibility of the host framework, various forms of guestinduced structural flexibility have been observed. To test the reversibility of the solvent exchange, the crystals were placed back into DMF for another 24 h and analysed. Variable temperature powder X-ray diffraction (VT-PXRD) was measured on the same instrument. Calculated powder X-ray diffraction patterns were generated using Mercury v3.7 The same wavelength (λ = 1.5406 Å) was used in the calculation These patterns were used to determine phase purity of the bulk material by comparison to the experimental data. Single crystal X-ray diffraction data collection and structure refinement of {[CoIJbtc)IJDMF)2]·2/3DMF}n (1) and {[CoIJbtc)IJDMF)2]·yPhCN}n (2). The X-ray diffraction pattern of 1 was determined to have Laue symmetry of 2/m, indicating the monoclinic crystal system. Absorption correction was performed using SADABS40 and structure elucidation was carried out as for 1
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