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DOI: 10.1039/A708644J (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 2103-2108

Laser-induced photoacoustic calorimetric determination of enthalpy and volume changes in photolysis of 5′-deoxyadenosylcobalamin and methylcobalamin

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Lai Bin Luo, Gang Li, Hui Lan Chen, Shao Wei Fu and Shu Yi Zhang

Abstract

Photolysis of 5′-deoxy-5′-adenosylcobalamin (AdoCbl) in neutral aqueous solution and methylcobalamin (MeCbl) in neutral and acid aqueous solution has been investigated using pulsed, time-resolved photoacoustic calorimetry in the temperature range 10–30 °C. The enthalpy changes for the above cobalamins, 129 ± 17, 163 ± 21 and 176 ± 23 kJ mol–1, respectively, are consistent with the values obtained by thermolytic kinetic methods. The reaction volume changes for them, 6 ± 1, 2 ± 0.5 and 5 ± 1 ml mol–1, respectively, are probably due to the conformational changes of the corrin ring and its side chains accompanying Co–C bond cleavage.

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