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首页> 外文期刊>Journal of Biophysical Chemistry >Thermodynamics of the Second Stage Dissociation Step (pK2) of Buffer Monosodium 1,4-Piperazinediethanesulfonate from (278.15 to 328.15) K
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Thermodynamics of the Second Stage Dissociation Step (pK2) of Buffer Monosodium 1,4-Piperazinediethanesulfonate from (278.15 to 328.15) K

机译：缓冲液1,4-哌嗪二乙烷磺酸钠（278.15至328.15）K的第二级解离步骤（pK2）的热力学

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摘要

Values of the second thermodynamic dissociation constant pK2 of the protonated form of monosodium 1,4-piperazinediethanesulfonate (PIPES) have been determined at twelve different temperatures in the temperature range from (278.15 to 328.15) K including the body temperature 310.15 K by measurement of the electromotive-force for cells without liquid junction of the type: Pt (s), H2 (g), 101.325 kPa|Na-PIPES (m1) + Na 2-PIPES (m2) + NaCl (m3)|AgCl (s), Ag (s), where m1, m2 and m3 indicate the molalities of the corresponding species at 1 atm = 101.325 kPa in SI units. The pK2 values for the dissociation of Na-PIPES are represented by the equation: pK2 = -1303.76/T + 48.369 - 6.46889 lnT with an uncertainty of ± 0.001. The values of pK2 for Na-PIPES were found to be 7.1399 ± 0.0004 at 298.15 K and 7.0512 ± 0.0004 at 310.15 K, respectively, and indicate that this buffer would be useful as pH standard in the range of physiological application. Standard thermodynamic quantities for the acidic dissociation process of Na-PIPES have been derived from the temperature coefficients of the pK2. These values are compared with those of structurally related N-substituted PIPERAZINE and TAURINE at 298.15 K.
机译：1,4-哌嗪二乙烷磺酸单钠（PIPES）的质子化形式的第二热力学解离常数pK2的值在包括人体温度310.15 K在内的（278.15至328.15）K的十二个不同温度下通过测量无液接面类型的电池的电动势：Pt（s），H2（g），101.325 kPa | Na-PIPES（m1）+ Na 2-PIPES（m2）+ NaCl（m3）| AgCl（s）， Ag（s），其中m1，m2和m3表示1 atm = 101.325 kPa处相应物种的摩尔浓度，以SI单位表示。 Na-PIPES解离的pK2值由以下方程式表示：pK2 = -1303.76 / T + 48.369-6.46889 lnT，不确定度为±0.001。 Na-PIPES的pK2值在298.15 K时为7.1399±0.0004，在310.15 K时为7.0512±0.0004，表明该缓冲液在生理应用范围内可用作pH标准。 Na-PIPES酸离解过程的标准热力学量已从pK2的温度系数中得出。将这些值与在298.15 K下与结构相关的N-取代的哌嗪和牛磺酸的值进行比较。

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