title: Twice as smart behavior of tert-butylthiacalix[4]arene derivative in glassy and crystalline form.
abstract: A studied tert-butylthiacalix[4]arene derivative with four N-(2-acetoxyethyl)carbamoylmethoxy substituents on its lower rim in partial-cone configuration (calixarene 1) can remember its previous treatment in three essentially different ways by the formation either of a molecular glass or two metastable polymorphs after heating or the removal of an included guest molecule. Guest-induced memory is very selective with a polymorph created only after the release of a few included guests among a large series of those studied and is detected via an exothermic transition. Along with ordinary properties, like glass transition, curing and cold crystallization, the molecular glass from 1 is selective due to its ability to crystallize in solvent vapors and vapor mixtures over a well-defined concentration range. Being cooperative, this property may be used for the visual detection of ethanol content in water solution when it reaches a threshold value.
authors.affiliation: A.M. Butlerov Institute of Chemistry, Kazan Federal University, Kremlevskaya 18, 420008 Kazan, Russia. Valery.Gorbatchuk@kpfu.ru.
authors.forename: K V
authors.initials: KV
authors.lastname: Gataullina
authors.forename: M A
authors.initials: MA
authors.lastname: Ziganshin
authors.forename: I I
authors.initials: II
authors.lastname: Stoikov
authors.forename: A T
authors.initials: AT
authors.lastname: Gubaidullin
authors.forename: V V
authors.initials: VV
authors.lastname: Gorbatchuk
mesh_terms: D003460:Crystallization; D000431:Ethanol / Q000032:analysis; D005898:Glass / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*; D012996:Solutions; D013440:Sulfides / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D010636:Phenols; D012996:Solutions; D013440:Sulfides; C500450:thiacalix(4)arene; D014867:Water; D000431:Ethanol