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Citation: ZHENG Bo, LI He-Xian, WANG Guo-Chang, LIU Kun, YUAN Wei, LI He, LIANG Bo. Supramolecular Complexation in Water-Methanol Mixtures[J]. Acta Physico-Chimica Sinica, ;2008, 24(08): 1503-1506. doi: 10.3866/PKU.WHXB20080830 shu

Supramolecular Complexation in Water-Methanol Mixtures

1.
Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, P. R. China

Received Date: 27 February 2008
Available Online: 5 June 2008

The complex structures in the entire composition range of water-methanol mixture were studied by pyrene fluorescence probe. The results showed that the decrease rate of I1/I3, the pyrene scale for solvent polarity, exhibited clear dependence on the mole fraction (xm) range of methanol in the mixture, while the relative quantum yield of pyrene fluorescence showed a remarkable maximum at xm=0.18. These results revealed that in a wide range of 0.18<xm<0.75, the molecules of water and methanol mainly formed water/methanol (W/M) complexes (W5M1-5) and methanol/water (M/W) complexes (M6W2-4, M8W1-3), and a transition of“W/M→M/W”complexes would occur at xm≈0.50. This notion provides a conjuncture to reconcile the two existing formulations about water-methanol complexation.
- Water-methanol; Complex structure; Pyrene; Fluorescence probe; Hydrogen bond
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