Incorporation of an A1/A2-Difunctionalized Pillar[5]arene into a Metal–Organic Framework

An efficient synthetic route to an A1/A2-difunctionalized
pillar[5]­arene
containing resolvable planar chirality has been developed and the
arene employed as a strut in the synthesis of P5A-MOF-1, which has been demonstrated by X-ray powder diffraction analysissupported
by modelingto be isoreticular with MOF-5. This metal–organic
framework has an active domain that expresses good and selective uptake
of neutral and positively charged electron-poor aromatic guests, which
effect color changes of the cubic crystals from faint yellow to deep
orange, arising from charge transfer between the guests and active
domain of P5A-MOF-1.