poly(ethylene glycol) chain (Mn = 4,600 Da)-in DMSO (5 wt.% PL), with or without the inclusion of guest (Figure ). Gels were annealed for 2 h at 60 °C with inclusion of sufficient equivalents of each guest to achieve >95% binding occupancy (see Table in the Supporting Information section "polyMOC Gel Fabrication and Characterization" for more details). This procedure yielded robust, free-standing materials (Figure ) in all cases, which we refer to as