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Dynamic Analyses on Induced‐Fit Gaseous Guest Binding to Organic Crystals with a Quartz‐Crystal Microbalance
Author(s) -
Matsuura Kazunori,
Ariga Katsuhiko,
Endo Ken,
Aoyama Yasuhiro,
Okahata Yoshio
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/(sici)1521-3765(20000515)6:10<1750::aid-chem1750>3.0.co;2-a
Subject(s) - quartz crystal microbalance , chemistry , molecule , crystal (programming language) , adsorption , cyclohexane , ethyl acetate , anthracene , ketone , crystallography , photochemistry , organic chemistry , computer science , programming language
The inclusion behavior of gaseous guest molecules in a solid apohost, an orthogonal anthracene‐bis(resorcinol)tetraol ( 1 ), was investigated with a quartz‐crystal microbalance (QCM). Compound 1 forms crystals composed of molecular sheets bound together by an extensive hydrogen‐bonded network. An apohost of 1 was cast onto a QCM and the binding of gaseous guest molecules was followed as a function of time by observing the decrease in the oscillation frequency, which is directly related to the increase in mass. Ethyl acetate and methyl ethyl ketone were significantly included into the apohost, whereas benzene and cyclohexane were simply adsorbed onto the surface of the solid; all these guests have similar vapor pressures at 25 °C. On the other hand, a host analogue 2 , a tetramethoxy derivative of 1 , barely included these guest molecules. The inclusion amount and the rate of inclusion of ethyl acetate or methyl ethyl ketone showed a drastic increase above a threshold concentration of guests in the gas phase. Thus, the structure of the apohost changed cooperatively in order to bind guest molecules above the threshold guest concentration. This cooperativity of the binding behavior was kinetically analyzed.