An approximate method is put forward allowing one to extract information on the parameters determining rate constants (activation energies and frequency factors) from non-isothermal measurements of quantities proportional to the concentrations of reactants (e.g., absorbance). The method, based on an approximate solution of a first-order kinetic equation in a non-isothermal regime, has been extended to fractional-heating experiments—a technique often used to extract parameters of the distributions of rate constants. The method was employed to obtain information on the parameters controlling the thermally driven cis–trans isomerisation of a novel photochromic azobenzene derivative: azobenzene-containing crown ether dissolved in a polystyrene matrix. The kinetics of the thermal isomerisation is controlled by a distribution of rate constants, with the activation energy amounting to ca. 97 kJ mol−1 and the
 frequency factor of the order of 1010 s−1 The results obtained are in a good agreement with results of isothermal experiments performed on similar systems.
                                    提出了一种近似方法,允许人们从与反应物浓度成比例的量(例如吸光度)的非等温测量中提取决定速率常数(活化能和频率因子)的参数信息。该方法基于非等温状态下的一阶动力学方程的近似解,已扩展到分数加热实验——一种通常用于提取速率常数分布参数的技术。该方法被用于获取控制新型光致变色
偶氮苯衍
生物热驱动顺式-反式异构化的参数信息:溶解在聚
苯乙烯基质中的含
偶氮苯的
冠醚。热异构化的动力学由速率常数的分布控制,活化能约为97 kJ mol-1,频率因子约为1010 s-1。所获得的结果与类似系统上的等温实验结果非常一致。