TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Claimed Method: operating (M3) a replenishable canister for release and recovery of a volatile component in a constrained environment. involving (e1) providing a vessel containing a solid structure having a lattice structure of molecular crystals having lattice voids and incorporating calixarene molecules in the hexagonal close-packed assembly of trimers of the calixarene molecules associated together predominantly by (a) to provide the host assembly having interstitial voids; (e2) retaining a volatile component which is normally gaseous at the ambient temperature within the interstitial voids to provide the guest/host assembly of the lattice structure and the volatile component; (e3) heating the vessel to heat the hexagonal close packed assembly of the molecules to destabilize the guest/host assembly and disassembling the calixarene molecules to release the volatile component; (e4) supplying the released volatile component to utilization location within the constrained environment; (e5) the step (d5); and (e5) recovering at least a portion of the volatile component from the utilization location and transferring the recovered volatile component to the canister to infuse the recovered volatile component to reestablish the volatile component in the guest/host assembly to reestablish the canister containing the recovered volatile component in which the volatile component is retained as a guest in the assembly predominantly by (a).Preferred Assembly - The utilization location is a heated source of combustion or potential combustion within the constrained environment. In (M3), the volatile component is a halon effective to suppress combustion at the location within said constrained environment.Preferred Components: The calixarene molecules are calix (4)arenes, calix(6)arenes, and/or calix(8)arenes (preferably calix(4)arene molecules). The guest component is normally gaseous hydrocarbons, halocarbons having boiling points of -252 - 10degreesC, or methane, ethane hydrogen, carbon tetrachloride, fluorocarbons, bromofluorocarbons, iodofluorocarbons, bromochlorofluorocarbons, iochlorofluorocarbons, iodocarbons, or chlorofluorocarbon having boiling points of -252 - 190degreesC (preferably hydrogen, methane, or ethane, especially hydrogen or methane). The calixarene molecules comprise calix(4)arene, cyclohexyl-calix(4)ene, or thiacalix(4)arene molecules. The volatile fuel component in (M2) is hydrogen or at least one of 1-4C hydrocarbon (preferably hydrogen or methane). EXAMPLE - No relevant example given.