Table 4 Assignments of the different bending COO- band modes.

From: Anticorrosion and antimicrobial performance of extracted and fractionated phytochemicals of terminalia bentzoe leaves

Wave number (Cm− 1)

Transmittance

Assignments

ME

n-BF

QF

3330b

0.051

0.096

0.284

Symmetric stretching of hydrogen bonded OH group in carboxylic acid

1730m

0.355

0.400

0.707

Symmetric stretching vibrations of (C=O) group in carboxylic and ester groups

1177m

0.402

0.447

0.761

Symmetric stretching for (C-O-C) group

1157sh

0.482

0.527

0.796

840w

0.887

0.932

0.980

Deformation vibrations (C-O-C) and C-C-O groups

685m

0.751

0.796

0.885

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