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首页> 外文期刊>The Journal of Chemical Thermodynamics >THERMOCHEMISTRY OF (GERMANIUM PLUS SULFUR) .4. CRITICAL EVALUATION OF THE THERMODYNAMIC PROPERTIES OF SOLID AND GASEOUS GERMANIUM(II) SULFIDE GES AND GERMANIUM(IV) DISULFIDE GES2, AND DIGERMANIUM DISULFIDE GE2S2(G) - ENTHALPIES OF DISSOCIATION OF BON
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THERMOCHEMISTRY OF (GERMANIUM PLUS SULFUR) .4. CRITICAL EVALUATION OF THE THERMODYNAMIC PROPERTIES OF SOLID AND GASEOUS GERMANIUM(II) SULFIDE GES AND GERMANIUM(IV) DISULFIDE GES2, AND DIGERMANIUM DISULFIDE GE2S2(G) - ENTHALPIES OF DISSOCIATION OF BON

机译:(锗加硫).4的热化学。固态和气态二硫化锗和二硫化锗GE2和二硫化二锗GE2S和G的热力学性质的临界评价-硼的解离焓

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This is a critical evaluation of the thermodynamic properties of the known solid and gaseous compounds of(germanium + sulfur): GeS(cr), GeS(g), GeS2(cr), GeS2(g), and Ge2S2(g). The heat capacity of GeS(cr) at low and moderate temperatures was evaluated from all the information available in the literature, and the properties: C-p,m(o)(T), {H-m(o)(T)-H-m(o)(T')}, S-m(o)(T), and Phi(m)(o)(T) = (Delta(o)(T)S(m)(o) - Delta(T)(T)H(m)(o)/T), where T' = 298.15 K, were computed to T = 930 K, close to the melting temperature, above which decomposition to a (germanium + sulfur) eutectic and uncombined germanium is believed to occur. On the basis of our recent Value for Delta(r)(H)(m)(o)(GeS, cr, 298.15 K) (J. Chem. Thermodynamics 1994, 26, 727), Delta(r)H(m)(o)(T) and Delta(f)G(m)(o)(T) were also calculated over the same temperature range. A critical assessment of the enthalpy of sublimation Delta(sub)H(m)(o) yielded Delta(r)H(m)(o)(GeS, g, T). In another part of the present series (J. Chem. Thermodynamics 1995, 27, 99), we determined Delta(r)H(m)(o)(GeS2, cr, 298.15 K); the corresponding Delta(r)H(m)(o)(GeS2, cr, T) is tabulated in the present paper to T = 1000 K. Ab initio molecular-orbital calculations showed the cyclic (C-2v) arrangement to be the most stable for Ge2S2(g), and the predicted structure and vibrational wavenumbers were used in calculations of its thermodynamic properties as a function of temperature by means of statistical mechanics. A similar treatment of the linear GeS2(g) is described. The assessed Delta(r)H(m)(o)(GeS, g, T --> O) is in harmony with our reinterpreted molar enthalpy of dissociation D-m(o)(GeS) from spectroscopy; and the enthalpies of dissociation of the bonds in GeS2(g) and Ge2S2(g) are also discussed. In summary, the molar enthalpy of dissociation of the (triple) bond in GeS, 535 kJ . mol(-1), is the largest for any Ge-to-S linkage, and the mean molar enthalpy of dissociation of the (double) bonds in GeS2, 404 kJ . mol(-1), is greater by 110 kJ . mol(-1) than [D-m(o)(Ge2S2)] because, presumably, Ge2S2(g) has essentially single Ge-S bonds only. The molar enthalpy of dissociation of the ''primary'' bond D-m(o)(S-GeS) is of comparable magnitude to the mean molar dissociation enthalpy of the Ge-S bonds in Ge2S2(g). [References: 57]
机译:这是对(锗+硫)的已知固体和气体化合物(GeS(cr),GeS(g),GeS2(cr),GeS2(g)和Ge2S2(g)的热力学性质的关键评估。根据文献中所有可用信息评估了GeS(cr)在低温和中温下的热容,其性质为:Cp,m(o)(T),{Hm(o)(T)-Hm(o )(T')},Sm(o)(T)和Phi(m)(o)(T)=(Delta(o)(T)S(m)(o)-Delta(T)(T) H(m)(o)/ T),其中T'= 298.15 K,计算得出T = 930 K,接近熔化温度,在该温度之上,据信会分解为(锗+硫)低共熔和未结合的锗。根据我们最近对Delta(r)(H)(m)(o)(GeS,cr,298.15 K)的值(J.Chem.Thermodynamics 1994,26,727),Delta(r)H(m)还计算了在相同温度范围内的(o)(T)和Delta(f)G(m)(o)(T)。对升华Delta(sub)H(m)(o)的焓进行严格评估,得出Delta(r)H(m)(o)(GeS,g,T)。在本系列的另一部分中(J. Chem。Thermaldynamics 1995,27,99),我们确定了Delta(r)H(m)(o)(GeS2,cr,298.15 K);本文将相应的Delta(r)H(m)(o)(GeS2,cr,T)列表化为T = 1000K。从头算分子轨道计算表明,循环(C-2v)排列为对Ge2S2(g)最稳定,并且通过统计力学将预测的结构和振动波数用于计算其随温度变化的热力学性质。描述了线性GeS2(g)的类似处理。评估的Delta(r)H(m)(o)(GeS,g,T-> O)与我们重新解释的从光谱学上解离的D-m(o)(GeS)摩尔焓有关;讨论了GeS2(g)和Ge2S2(g)中键的解离焓。总之,GeS中(三重)键解离的摩尔焓为535 kJ。 mol(-1)对于任何Ge-to-S键来说都是最大的,GeS2中(双)键解离的平均摩尔焓为404 kJ。 mol(-1)大于110 kJ。 mol(-1)比[D-m(o)(Ge2S2)]要大,因为Ge2S2(g)基本上只有一个Ge-S键。 ``主要''键D-m(o)(S-GeS)的解离摩尔焓与Ge2S2(g)中Ge-S键的平均摩尔解离焓相当。 [参考:57]

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