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Citation: WAN Jun-min, HU Zhi-wen, CHEN Wen-xing, ZHENG Shi-rui, LU Sheng-shui, ZHANG Li. Molecular Inclusion Recognition of Dihydroxybenzenes by Cellulose Fibre Grated β-cyclodextrin[J]. Acta Physico-Chimica Sinica, ;2006, 22(02): 244-248. doi: 10.3866/PKU.WHXB20060223 shu

Molecular Inclusion Recognition of Dihydroxybenzenes by Cellulose Fibre Grated β-cyclodextrin

1.
Key Laboratory for Advanced Textile Materials and Manufacturing Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China

Received Date: 9 August 2005
Available Online: 22 January 2006

The complex stability constants for the 1∶1 inclusion complexation of various dihydroxybenzenes (pyrocatechol, hydroquinone, resorcinol) with cellulose fibre grafted β-cyclodextrin have been determined by means of spectrophotometric titrations at different temperatures in aqueous solutions with different pH values. The molecular recognition mechanism for various complexes of dihydroxybenzenes and β-cyclodextrin is discussed from the viewpoint of stability constants, apparent thermodynamic parameters, the size/shape-fit, multiple recognition, and pH value of inclusion systems of dihydroxybenzenes between the host cavity and the guest molecules. The results show that the cellulose fibre grafted β-cyclodextrin possesses a special binding ability and molecular selectivity for dihydroxybenzenes, the complex stability constants of dihydroxybenzenes are Ka(resorcinol)>Ka(hydroquinone)>Ka(pyrocatechol), apparent thermodynamic parameters of dihydroxybenzenes are ΔH(resorcinol )<ΔH(hydroquinone)<ΔH(pyrocatechol) and ΔS(resorcinol)<ΔS(hydroquinone)< ΔS(pyrocatechol).
- β-cyclodextrin;Cellulose fibre;Inclusion properties;Molecular recognition;Dihydroxybenzenes
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