Thermodynamic Properties for Polybrominated Dibenzothiophenes by Density Functional Theory  被引量:2

Thermodynamic Properties for Polybrominated Dibenzothiophenes by Density Functional Theory

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作  者:李加友 柳红霞 于红霞 王遵尧 王连生 

机构地区:[1]School of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China [2]Department of Environment, Nanjing University, Nanjing 214007, China

出  处:《Chinese Journal of Chemical Engineering》2009年第6期999-1008,共10页中国化学工程学报(英文版)

基  金:Supported by the National Natural Science Foundation of China (20737001).

摘  要:The thermodynamic properties of 135 polybrominated dibenzothiophenes (PBDTs) in the gaseous state at 298.15 K and 1.013×10^5 Pa, are calculated using the density functional theory (the B3LYP/6-311G^**) with Gaussian 03. Based on these data, the isodesmic reacflons are designed to calculate the standard enthalpy of formation (△fH^θ) and the standard Gibbs energy of formation (△fG^θ) of PBDTs. The relations of these thermodynamic parameters with the number and positionof bromine subsfituents (NPBS) are discussed, and it is found that there exist good correlations between othermody namic parameters (including heat capacity at constant volume, entropy, enthaipy, free energy, △fH^θ, △fG^θ) and NPBS. Thoe relative stability order of PBDT congeners is proposed theoretically based on the relative magnitude of their △fG^θ. In addition, the values of molar heat capacities at constant pressure (Cp,m) for PBDT c ongelaers are calculated.处于在 298.15 K 和 1.013 &#xd7 的气体的状态的 135 polybrominated dibenzothiophenes (PBDT ) 的热力学的性质; 10 <sup>5</sup> Pa,用密度被计算功能的理论(B3LYP/6&#x2013; 311G**) 与 Gaussian 03。把数据基于这些, isodesmic 反应被设计计算形成的标准热含量(&#x394; <sub > f </sub > H <sup>&#x3b8;</sup>) 和形成的标准吉布斯精力(&#x394; <sub > f </sub > PBDT 的 G <sup>&#x3b8;</sup>) 。有溴取代者的数字和位置的这些热力学的参数的关系( N <sub > PBS </sub>)被讨论,并且在那里存在,这被发现在热力学的参数之间的好关联(包括在经常的体积的热能力,熵,热含量,免费精力, &#x394 ; <sub > f </sub > H <sup>&#x3b8;</sup>, &#x394 ; <sub > f </sub > G <sup>&#x3b8;</sup>)和 N <sub > PBS </sub>。PBDT 同种的物的相对稳定性顺序基于他们的 &#x394 的相对大小理论上被建议; <sub > f </sub > G <sup>&#x3b8;</sup> 。另外,在常数的臼齿的热能力的价值迫使(C <sub > p,为 PBDT 同种的物的 m </sub>) 被计算。

关 键 词:polybrominated dibenzothiophenes density functional theory method of position of substituted Br atom thermodynamic parameters relative stability 

分 类 号:O641.121[理学—物理化学] O623.11[理学—化学]

 

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