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New insights in the physicochemical investigation of the vitamin B(12)nucleus using statistical physics treatment: interpretation of experiments and surface properties

机译：使用统计物理处理的维生素B（12）核的物理化学研究的新见解：对实验和表面性质的解释

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In this research paper, the equilibrium isotherms for the adsorption of cobalt(ii)nitrate and cobalt(ii)chloride on tetrakis(4-tolylphenyl)porphyrin (H2TTPP) were obtained at four temperatures for modeling analysis. The experimental data describing the adsorbed quantity of cobalt particles were measured using the quartz crystal microbalance (QCM) strategy. Then, statistical physics formalism was employed to interpret the complexation mechanism by applying the real gas law that contemplates the interaction between the adsorbate particles in the free state. Advanced models treated with the law of van der Waals were applied for the single and L.B.L adsorptions of Co(2+)at various temperatures (288-318 K). The experimental adsorption data of CoCl(2)on porphyrins were satisfactorily fitted with the monolayer equation, showing that the chlorine particles had no effect on the complexation system, while the nitrate particles were involved in the adsorption of Co(NO3)(2)and contributed to the layer formation. The physicochemical parameters of statistical physics models were estimated and used to compare the complexation mechanisms of both adsorbates. The study of the cohesion pressure (a) and the co-volume (b) confirmed that cobalt chloride guaranteed more stability during the formation of the vitamin B(12)nucleus. Deeper energetic analysis demonstrated that cobalt ions were complexed by ionic or covalent bonds in the case of cobalt chloride (complexation energy (-E-1/2) varies from -48.2 to -50.3), while a physisorption process took place in the case of cobalt nitrate ((-E-1) varies from -33.6 to -36.1), thus indicating that CoCl2-H2TTPP was the most stable complex. The statistical physics models were also used to investigate two thermodynamic functions that govern the adsorption mechanisms, namely, the configurational entropy and the Gibbs free enthalpy.
机译：在本研究论文中，在四个温度下，获得用于在四（4-甲苯基苯基）卟啉（H2TTPP）上的硝酸钴和钴（II）氯化钴（II）氯化物的平衡等温线以进行建模分析。使用石英晶体微稳定（QCM）策略测量描述吸附钴颗粒的实验数据。然后，使用统计物理形式主义来解释络合机制来解释拟预调解在自由状态下吸附颗粒之间的相互作用。范德华法治疗晚期模型，适用于在各种温度（288-318 K）有限公司（2+）的单L.B.L吸附。卟啉上的COCl（2）的实验吸附数据令人满意地配备单层方程，表明氯颗粒对络合体系没有影响，而硝酸盐颗粒涉及CO（NO3）（2）的吸附有助于层形成。估计统计物理模型的物理化学参数，并用于比较吸附剂的络合机制。凝聚力（a）和共体（b）的研究证实氯化钴在形成维生素B（12）核的形成过程中保证了更多的稳定性。更深的能量分析证明，在氯化钴的情况下，通过离子或共价键络合钴离子（络合能量（-e-1/2），在-48.2至-50.3）中，而在物质的情况下发生了物理化过程硝酸钴（（-e-1）从-33.6至-36.1变化），从而表明COCl2-H2TTPP是最稳定的复合物。统计物理模型也用于研究一种控制吸附机制的两个热力学功能，即配置熵和GIBBS Free焓。

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  • 来源
    《RSC Advances》 |2020年第37期|共12页
  • 作者

    Ben Yahia Manel; Ben Yahia Mohamed;

  • 作者单位

    King Abdulaziz Univ Rabigh Coll Sci &

    Arts Phys Dept POB 344 Jeddah 21911 Rabigh Saudi Arabia;

    Univ Monastir Fac Sci Monastir Phys Dept Lab Quantum &

    Stat Phys LR18ES18 Monastir 5000 Tunisia;

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  • 正文语种 eng
  • 中图分类 化学;
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