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Effect of the air humidity on the proton conductivity of some aminobenzenesulfonic acids

机译:空气湿度对某些氨基苯磺酸质子电导率的影响

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摘要

Effects of environment conditions (humidity and temperature) on the proton conductivity of aminobenzenesulfonic acids: 2-amino-(orthanilic) acid (I), 3-amino-(metanilic) acid (II), 4-amino-(sulfanilic) acid (III), their general formula NH2C6H4SO3H, and 3-amino-4-hydroxobenzenesulfonic acid (IV) [NH2(OH)C6H3SO3H), as well as (for sake of comparison) inorganic aminosulfonic acid [sulphamic acid (NH2SO3H)] (V) are studied. All above-listed compounds are zwitter-ions: they contain a fragment NH (3) (+) SO (3) (-) . The presence of this structural fragment affects the thermal stability of the compounds; according to the mass-spectrometry analysis data, the decomposition of the SO3-fragment begins at the following temperatures: (I) -339, (II) -370, (III) -320, (IV) -278, and (V) -220A degrees C. It is shown that the increase of the environment relative humidity up to 95% results in the increase of the aminobenzenesulfonic acids proton conductivity from 10(-9)-10(-8) to 10(-5) S cm(-1); sulphamic acid, to 10(-4) S cm(-1). At that, the amount of adsorbed water does not exceed 0.2 moles per 1 sulfo group in all cases. The conductance activation energy equals 0.2 eV at a relative humidity of 95%.
机译:环境条件(湿度和温度)对氨基苯磺酸的质子电导率的影响:2-氨基-(邻氨基苯甲酸)酸(I),3-氨基-(甲基苯胺酸)(II),4-氨基-(氨基苯磺酸)酸( III),它们的通式NH2C6H4SO3H和3-氨基-4-羟基苯磺酸(IV)[NH2(OH)C6H3SO3H),以及(出于比较目的)无机氨基磺酸[磺酸(NH2SO3H)](V)被研究。上面列出的所有化合物都是两性离子:它们包含NH(3)(+)SO(3)(-)片段。该结构片段的存在会影响化合物的热稳定性。根据质谱分析数据,SO3碎片的分解在以下温度下开始:(I)-339,(II)-370,(III)-320,(IV)-278和(V) -220A摄氏度。研究表明,环境相对湿度的增加高达95%,导致氨基苯磺酸质子传导率从10(-9)-10(-8)S cm增加到10(-5)S cm (-1);氨基磺酸至10(-4)S cm(-1)。那时,在所有情况下,吸附的水量不超​​过每1个磺基0.2摩尔。在95%的相对湿度下,电导活化能等于0.2 eV。

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