Structure-property relationship for clathrates formed in systems with guest vapor and 1,3-disubstituted <Emphasis Type="Italic">tert</Emphasis>-butylcalix[4]arene |
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| Authors: | M A Ziganshin L R Validova I S Antipin I I Stoikov A I Konovalov V V Gorbatchuk |
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| Institution: | 1.Butlerov Institute of Chemistry,Kazan State University,Kazan;2.Arbuzov Institute of Organic and Physical Chemistry,Kazan Scientific Center,Kazan |
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| Abstract: | Structure-property relationship was studied for a series of clathrates formed in the systems that model guest-host interactions on the surface of chemical odor sensors of quartz microbalance type. The clathrates of 5,11,17,23-tetra-tert-butyl-25,27-dihydroxy-26,28-bis(2-naphthylmethoxy)calix4]arene (1) obtained by the saturation of its powder with gaseous organic compounds (guests) with the unity thermodynamic activity at 298 K were studied. The stoichiometry and temperature at the starting and ending points of thermal dissociation were determined for all the clathrates and stable intermediates by thermal gravimetric analysis. A sorption isotherm was determined for one guest-host combination; it indicates the formation of a stable clathrate in the system and phase transition of host upon reacting with guest. Decrease in thermal stability of the clathrates of 1 with guests of greater size was observed for studied pairs of homologous guests. |
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