Effect of Temperature on Ultraviolet Absorption Spectra of Benzoic Acids and its Relation to Hydrogen Bonding

Experimental and theoretical studies of electronic energy states of methyl benzoate derivatives

“…, shows a regular vibrational structure), 1 L a ' 1 A (l max ( 1 L a ) ¼ 204 nm, e ¼ 8800 M À1 cm À1 , possesses a broadened vibrational structure) and 1 B b ' 1 A (l max ( 1 B b ) ¼ 184 nm, e ¼ 68000 M À1 cm À1 ), which is a fully allowed transition whereas the former are symmetry forbidden [39,40]. Corresponding data concerning the absorption spectrum of benzene are given in Table 1 The absorption spectrum of MB in the region of the accessible UV consists three distinct bands.…”

“…Corresponding data concerning the absorption spectrum of benzene are given in Table 1 The absorption spectrum of MB in the region of the accessible UV consists three distinct bands. The bands labelled as C, B and A, respectively [39] possess wavelength maxima at: l max ¼ 280 nm (S 1 ( 1 L b )'S 0 ( 1 A)); l max ¼ 228 nm (S 2 ( 1 L a )'S 0 ( 1 A)) and l max ffi192 nm (S 3 ( 1 B b )'S 0 ( 1 A)). It is easy to verify that the corresponding bands of MB show a mesomeric shift of DñðCÞ ¼ 3586 cm À1 , DñðBÞ ¼ 5140 cm À1 and DñðAÞ ¼ 3420 cm À1 in respect to benzene (see Table 1).…”

Theoretical modeling of the O–H stretching IR bands of hydrogen-bonded dimers of benzoic acid in S and S1 electronic states

“…Ito et al 12 investigated the effect of dimerization on the UV absorption spectrum. The electronic spectra of benzoic acid have been a subject of extensive studies for a long time.…”

Experimental and theoretical spectroscopic studies of ortho derivatives of methyl p-dimethylaminobenzoate

“…Additionally, the long-wavelength band of ortho-substituted derivatives is disposed of vibrational structure. In the literature the bands are signed as C (lE275 nm), B (lE230 nm) and A (lE210 nm) similar to benzene absorption bands [21,22].…”