Anomalous effective polarity of an air/liquid-mixture interface: a heterodyne-detected electronic and vibrational sum frequency generation study

Physical Chemistry Chemical Physics : PCCP
Sudip Kumar MondalTahei Tahara

Abstract

We study the effective polarity of an air/liquid-mixture interface by using interface-selective heterodyne-detected electronic sum frequency generation (HD-ESFG) and vibrational sum frequency generation (HD-VSFG) spectroscopies. With water and N,N-dimethylformamide (DMF) chosen as two components of the liquid mixture, the bulk polarity of the mixture is controlled nearly arbitrarily by the mixing ratio. The effective polarity of the air/mixture interface is evaluated by HD-ESFG with a surface-active solvatochromic molecule used as a polarity indicator. Surprisingly, the interfacial effective polarity of the air/mixture interface increases significantly, when the bulk polarity of the mixture decreases (i.e. when the fraction of DMF increases). Judging from the hydrogen-bond structure at the air/mixture interface clarified by HD-VSFG, this anomalous change of the interfacial effective polarity is attributed to the interface-specific solvation structure around the indicator molecule at the air/mixture interface.

References

Apr 12, 1993·Physical Review Letters·Q DuY R Shen
Dec 3, 2008·The Journal of Chemical Physics·Shoichi Yamaguchi, Tahei Tahara
Aug 8, 2009·Angewandte Chemie·Sobhan SenTahei Tahara
May 1, 2010·Journal of the American Chemical Society·Satoshi NihonyanagiTahei Tahara
Jan 22, 2013·Annual Review of Physical Chemistry·Satoshi NihonyanagiTahei Tahara
Apr 20, 2014·Journal of the American Chemical Society·Satoshi NihonyanagiTahei Tahara
Mar 10, 2015·Physical Chemistry Chemical Physics : PCCP·Abdenacer IdrissiPál Jedlovszky
Feb 20, 2014·The Journal of Physical Chemistry Letters·Achintya KunduTahei Tahara
May 16, 2013·The Journal of Physical Chemistry Letters·Korenobu MatsuzakiTahei Tahara

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Citations

Dec 1, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Zaure AvazbaevaDoseok Kim
Mar 23, 2020·The Journal of Chemical Physics·Deepak TomarKailash C Jena

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