JoVE Logo

로그인

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.

However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm1. The C=O bond of the conjugated aliphatic and aromatic carboxylic acids shows an even lower stretching frequency at 1690 cm1.

In IR spectra of carboxylic acids, the stretching absorptions for the C–H and O–H bonds overlap and exhibit absorption around 3000 cm1, having sharp C–H peaks and a broad O–H peak. Many carboxylic acids also exhibit small spikes or shoulder bands between 2500 and 2700 cm1.

UV–vis spectroscopy of the carboxylic acids shows a weak band at a lower wavelength of 200–215 nm due to an n→π transition. However, in highly conjugated carboxylic acids, the n→π transition shifts to a higher wavelength with higher molar absorptivity.

Tags

IR SpectroscopyUV Vis SpectroscopyCarboxylic AcidsC O BondO H BondH bonded Carboxylic AcidsConjugated Carboxylic AcidsN Transition

장에서 13:

article

Now Playing

13.5 : IR and UV–Vis Spectroscopy of Carboxylic Acids

Carboxylic Acids

3.6K Views

article

13.1 : IUPAC 카르복실산의 명명법

Carboxylic Acids

8.7K Views

article

13.2 : 카르복실산의 물리적 특성

Carboxylic Acids

4.4K Views

article

13.3 : 카르복실산의 산도

Carboxylic Acids

6.5K Views

article

13.4 : 카르복실산의 산도에 대한 치환 효과

Carboxylic Acids

6.4K Views

article

13.6 : 카르복실산의 NMR 및 질량 분광법

Carboxylic Acids

3.6K Views

article

13.7 : 카르복실산의 준비: 개요

Carboxylic Acids

2.4K Views

article

13.8 : 카르복실산의 제조: 니트릴의 가수분해

Carboxylic Acids

3.8K Views

article

13.9 : 카르복실산의 제조: 그리나드 시약의 카르복실화

Carboxylic Acids

4.2K Views

article

13.10 : 카르복실산의 반응: 소개

Carboxylic Acids

2.9K Views

article

13.11 : 카르복실산에서 에스테르로: Acid-Catalyzed (Fischer) 에스테르화 개요

Carboxylic Acids

17.7K Views

article

13.12 : 카르복실산에서 에스테르로: 산 촉매(Fischer) 에스테르화 메커니즘

Carboxylic Acids

7.6K Views

article

13.13 : 카르복실산에서 메틸에스테르로: 디아조메탄을 사용한 알킬화

Carboxylic Acids

2.0K Views

article

13.14 : 카르복실산에서 염화물로

Carboxylic Acids

6.6K Views

article

13.15 : 카르복실산에서 1차 알코올로: 수소화물 환원

Carboxylic Acids

2.6K Views

See More

JoVE Logo

개인 정보 보호

이용 약관

정책

연구

교육

JoVE 소개

Copyright © 2025 MyJoVE Corporation. 판권 소유