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首页> 外文期刊>Journal of Physical and Chemical Reference Data >Thermochemical properties, Delta H-f degrees(298.15 K), S degrees(298.15 K), and C degrees(p)(T), of 1,4-dioxin, 2,3-benzodioxin, furan, 2,3-benzofuran, and twelve monochloro and dichloro dibenzo-p-dioxins and dibenzofurans
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Thermochemical properties, Delta H-f degrees(298.15 K), S degrees(298.15 K), and C degrees(p)(T), of 1,4-dioxin, 2,3-benzodioxin, furan, 2,3-benzofuran, and twelve monochloro and dichloro dibenzo-p-dioxins and dibenzofurans

机译:1,4-二恶英,2,3-苯并二恶英,呋喃,2,3-苯并呋喃的热化学性质,ΔHf度(298.15 K),S度(298.15 K)和C度(p)(T)十二种一氯和二氯二苯并对二恶英和二苯并呋喃

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Values for Delta(f)Hdegrees(298.15 K), Sdegrees(298.15 K), and C(p)degrees(T) (5less than or equal toT/Kless than or equal to6000) are computed by density functional B3LYP/6-31G(d,p) and B3LYP/6-311+G(3df,2p) calculation methods for 12 monochloro and dichloro dibenzo-p-dioxins and dibenzofurans: 1-chloro dibenzo-p-dioxin, 2-chloro dibenzo-p-dioxin, 1,6-dichloro dibenzo-p-dioxin, 1,8-dichloro dibenzo-p-dioxin, 1,9-dichloro dibenzo-p-dioxin, 2,8-dichloro dibenzo-p-dioxin, 3-chloro dibenzofuran, 4-chloro dibenzofuran, 1,6-dichloro dibenzofuran, 3,6-dichloro dibenzofuran, 3,7-dichloro dibenzofuran, and 4,6-dichloro dibenzofuran. Molecular structures and vibration frequencies are determined at the B3LYP/6-31G(d,p) level of theory. Isodesmic reactions are utilized at each calculation level to determine the enthalpy of formation of each species. Contributions to the entropy and the heat capacity from translation, vibration, and external rotations are calculated using the rigid-rotor-harmonic-oscillator approximation based on the B3LYP/6-31G(d,p) structures. The enthalpies of formation for 1,4-dioxin, furan, 2,3-benzodioxin, 2,3-benzofuran, dibenzo-p-dioxin, and dibenzofuran are also calculated. Thermochemical properties of two composite central atom groups and four interaction groups are derived for use in a group additivity scheme to calculate these thermochemical properties of polychlorinated dibenzo-p-dioxins and dibenzofurans. (C) 2003 American Institute of Physics. [References: 67]
机译:Delta(f)Hdegrees(298.15 K),Sdegrees(298.15 K)和C(p)degrees(T)的值(小于或等于5的T / K小于或等于6000的值)由密度函数B3LYP / 6-31G计算得出(d,p)和B3LYP / 6-311 + G(3df,2p)的计算方法,用于12种一氯和二氯二苯并对二恶英和二苯并呋喃:1-氯二苯并对二恶英,2-氯二苯并对二恶英,1,6-二氯二苯并对二恶英,1,8-二氯二苯并对二恶英,1,9-二氯二苯并对二恶英,2,8-二氯二苯并对二恶英,3-氯二苯并呋喃, 4-氯二苯并呋喃,1,6-二氯二苯并呋喃,3,6-二氯二苯并呋喃,3,7-二氯二苯并呋喃和4,6-二氯二苯并呋喃。分子结构和振动频率在理论上的B3LYP / 6-31G(d,p)水平确定。在每个计算级别利用等渗反应来确定每种物质形成的焓。使用基于B3LYP / 6-31G(d,p)结构的刚体-转子-谐波振荡器近似,可以计算出平移,振动和外部旋转对熵和热容的贡献。还计算了1,4-二恶英,呋喃,2,3-苯并二恶英,2,3-苯并呋喃,二苯并-对-二恶英和二苯并呋喃的形成焓。推导了两个复合中心原子基团和四个相互作用基团的热化学性质,用于基团加和方案,以计算多氯二苯并-对-二恶英和二苯并呋喃的热化学性质。 (C)2003美国物理研究所。 [参考:67]

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