Photoisomerization of Azobenzene

trans-Azobenzene → cis-Azobenzene

개요

UV light (340 nm) converts the thermodynamically stable trans isomer of azobenzene to the cis form through rotation around the N=N bond. Visible light (450 nm) or thermal relaxation converts it back. The large geometric change (9 Å to 5.5 Å end-to-end distance) makes azobenzene a versatile molecular switch.

일상 속 예시

Azobenzene-based molecular motors can move objects millions of times their own mass when triggered by light.

산업적 중요성

아조벤젠 광스위치는 분자 기계, 약물 전달 시스템, 액정 디스플레이, 데이터 저장 연구에 사용됩니다.

성질

유형
Photochemical
가역 반응
예
에너지
흡열
ΔH
50.0 kJ/mol

관련 반응

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Photoisomerization of Azobenzene?
The balanced equation is: trans-Azobenzene → cis-Azobenzene.
What type of reaction is Photoisomerization of Azobenzene?
Photoisomerization of Azobenzene is a photochemical reaction. It is reversible under certain conditions.
Is Photoisomerization of Azobenzene exothermic or endothermic?
Photoisomerization of Azobenzene is endothermic (absorbs energy). The enthalpy change (ΔH) is 50.0 kJ/mol.