Ultraviolet spectroscopy carboxylic acids

In 2000 Remmers et al. [24] used the combination of molecular beam techniques and high resolution laser spectroscopy (inherent line width 3 MHz) to obtain the first information on proton transfer tunneling in any isolated gas phase carboxylic acid dimer. They reported the measurement of a high resolution ultraviolet spectrum of benzoic acid dimer in the gas phase. The spectra showed two... 

The spectra of 3-phenyl-5,7,4 -trihydroxychromone-2-carboxylic acid and its ethyl ester have been determined in ethanol and in cyclohexane [135]. It is possible to distinguish between linear and angular benzochromone-carboxy-lic acids by ultraviolet spectroscopy [136]. The effect of various substituents on the colour and spectra of iV-substituted chromone-2-carboxamides has been mentioned earlier (p. 79). 

Peptides are known to show some specificity toward metal binding, as was shown by titration experiments nsing H-NMR [7,8], potentiometry [9], luminescence measnrements [10], infrared (IR), circular dichroism (CD), and ultraviolet (UV spectroscopies [11]. Poly-L-aspartic acid binds to metals such as Eu, Ce, La +, Cu ", and Pb ", and acts as a corrosion inhibitor for steel and iron. This property has been ascribed to the carboxylate side chain of aspartic acid [12,13]. 

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