Crown ethers at the aqueous solution-air interface: 1. Assignments and surface spectroscopy

被引：3

作者：

Niga, Petru ^{[1
]}

King, Wendy ^{[2
]}

Hedberg, Jonas ^{[1
]}

Johnson, C. Magnus ^{[1
]}

Frey, Jeremy G. ^{[2
]}

Rutland, Mark W. ^{[1
]}

机构：

[1] Royal Inst Technol, Sch Chem Sci & Engn, S-10044 Stockholm, Sweden

[2] Univ Southampton, Sch Chem, Southampton SO17 1BJ, Hants, England

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2011年 / 13卷 / 17期

基金：

英国工程与自然科学研究理事会;

关键词：

VIBRATIONAL SUM-FREQUENCY; SHIFTING HYDROGEN-BONDS; LIQUID WATER-SURFACE; GENERATION SPECTROSCOPY; AIR/WATER INTERFACE; CHARGED INTERFACE; LIPID-BILAYERS; MOLECULES; IONS; HYDRATION;

D O I：

10.1039/c0cp00604a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The surface of aqueous solutions of 4-Nitro Benzo-15-Crown-5 (NB15C5) and Benzo-15-Crown-5 (B15C5) has been studied using the surface sensitive technique vibrational sum frequency spectroscopy (VSFS). The NO, CN, COC and CH vibrational modes of these compounds at the air-water interface as well as OH vibrational modes of the surface water hydrating this compound have been targeted in order to obtain molecular information about arrangement and conformation of the adsorbed crown ether molecules at the air-water interface. The CH2 vibrational modes of crown ethers have been identified and found to be split due to interaction with ether oxygen. The spectra provide evidence for the existence of a protonated crown complex moiety at the surface leading to the appearance of strongly ordered water species. The interfacial water species are influenced by the resulting charged interface and by the strong Zundel polarizability due to tunneling of the proton species between equivalent sites within the crown ring.

引用

页码：7930 / 7938

页数：9

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