| 光声量热法测定辅酶B12光解的焓变和体积变化 |
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| 引用本文： | 李刚,罗来斌,陈慧兰,傅少伟,张淑仪. 光声量热法测定辅酶B12光解的焓变和体积变化[J]. 物理化学学报, 1998, 14(7): 615-619. DOI: 10.3866/PKU.WHXB19980708 |
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| 作者姓名： | 李刚 罗来斌 陈慧兰 傅少伟 张淑仪 |
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| 作者单位： | State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing 210093,Laboratory of Modern Acoustics and Institute of Acoustics,Nanjing University,Nanjing 210093 |
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| 摘 要： | 用时间分辨的光声量热法研究了浦防B12的光解反应，首次测定了脉冲激光诱导输酶B12光解反应的治变和反应体积变化，其值分别为131±12kJ·mol-1和6±1mL·mol-1，推测该反应体积变化可能与Co－C健断裂引起的柔性咕啉环构象变化有关．
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| 关 键 词： | 辅酶B12 光声量热 焓变 体积变化 |
| 收稿时间： | 1997-10-27 |
| 修稿时间： | 1998-02-23 |
Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B_(12) Using Photoacoustic Calorimetry |
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| Li Gang,Luo Laibin,Chen Huilan. Determination of Enthalpy and Volume Changes in Photolysis of Coenzyme B_(12) Using Photoacoustic Calorimetry[J]. Acta Physico-Chimica Sinica, 1998, 14(7): 615-619. DOI: 10.3866/PKU.WHXB19980708 |
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| Authors: | Li Gang Luo Laibin Chen Huilan |
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| Affiliation: | State Key Laboratory of Coordination Chemistry,Nanjing University,Nanjing 210093|Laboratory of Modern Acoustics and Institute of Acoustics,Nanjing University,Nanjing 210093 |
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| Abstract: | 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. |
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| Keywords: | Coenzyme B_(12) Photoacoustic calorimetry Enthalpy Volume change |
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