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Citation: Li Gang, Luo Lai-Bin, Chen Hui-Lan, Fu Shao-Wei, Zhang Shu-Yi. Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B₁₂ Using Photoacoustic Calorimetry[J]. Acta Physico-Chimica Sinica, ;1998, 14(07): 615-619. doi: 10.3866/PKU.WHXB19980708 shu

Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B₁₂ Using Photoacoustic Calorimetry

1.
State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing 210093

Received Date: 27 October 1997
Available Online: 15 July 1998

The photolysis of coenzyme B12 (5'-deoxyadenosylcobalamin, AdoCbl) at 355nm in aqueous solution is investigated by Photoacoustic Calorimetry (PAC). Both enthalpy and reaction volume change for this photoinitiated reaction have been determined to be 131±12 kJ.mol-1 and 61 mLmol-1 , respectively. It can be suggested that the reaction volume change is related tothe conformational change of corrin ring which accompanies the homolytic cleavage of the cobalt-carbon(Co-C) bond.
- Coenzyme B12,
- Photoacoustic calorimetry,
- Enthalpy,
- Volume change
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通讯作者: 陈斌, bchen63@163.com

Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B₁₂ Using Photoacoustic Calorimetry