© 2019 by the authors. Materials that combine flexibility and open metal sites are crucial for myriad applications. In this article, we report a 2D coordination polymer (CP) assembled from CuII ions and a flexible meta-carborane-based linker [Cu2(L1)2(Solv)2]•xSolv (1-DMA, 1-DMF, and 1-MeOH; L1: 1,7-di(4-carboxyphenyl)-1,7-dicarba-closo-dodecaborane). 1-DMF undergoes an unusual example of reversible phase transition on solvent treatment (i.e., MeOH and CH2Cl2). Solvent exchange, followed by thermal activation provided a new porous phase that exhibits an estimated Brunauer-Emmett-Teller (BET) surface area of 301 m2 g−1 and is capable of a CO2 uptake of 41 cm3 g−1. The transformation is reversible and 1-DMF is reformed on addition of DMF to the porous phase. We provide evidence for the reversible process being the result of the formation/cleavage of weak but attractive B–H···Cu interactions by a combination of single-crystal (SCXRD), powder (PXRD) X-ray diffraction, Raman spectroscopy, and DFT calculations.
- Boron hydrides
- Metal-organic frameworks
- Open metal sites
- Reversible phase transition
Gan, L., Fonquernie, P. G., Light, M. E., Norjmaa, G., Ujaque, G., Choquesillo-Lazarte, D., Fraile, J., Teixidor, F., Viñas, C., & Planas, J. G. (2019). A reversible phase transition of 2D coordination layers by B–H···Cu(II) interactions in a coordination polymer. Molecules, 24, . https://doi.org/10.3390/molecules24173204