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首页> 外文期刊>Journal of the Indian Chemical Society >Reaction of L-cystine with cis-diaqua(ethylenediamine)platinum(II) cation : A kinetic and mechanistic study
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Reaction of L-cystine with cis-diaqua(ethylenediamine)platinum(II) cation : A kinetic and mechanistic study

机译:L-胱氨酸与顺二乙二胺(乙二胺)铂(II)阳离子反应的动力学和机理研究

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摘要

Substitution reaction of cis-diaqua(ethylenediamine)platinum(II) cation by L-cystine (H_4L~(2+)) has been studied spectrophotometrically over the range 7.5 <= 10~4 [H_4L~(2+)]_T <= 50.0,3.04 <= pH <= 4.43,40 <= t <= 60 deg C and I = 0.1 mol dm~(-3) (NaClO_4).The reaction takes place via an outer sphere association between the aquaplatinum(II) cation and H_4L~(2+) followed by transformation of the outer into inner-sphere complex by slow interchange.The anation rate constant at 25 deg C and I = 0.1 mol dm~(-3) (NaClO_4) is found to be 3.39 x 10~(-4) s~(-1),DELTA H and DELTA S for k_(an) path are found to be 28.9 kJ mol~(-1) and -214.4 JK~(-1) mol~(-1).The anation reaction at platinum(II) center follows an Ia path.
机译:在7.5 <= 10〜4 [H_4L〜(2 +)] _ T <=的范围内用分光光度法研究了L-胱氨酸(H_4L〜(2+))取代顺-二氨基(乙二胺)铂(II)阳离子的反应50.0,3.04 <= pH <= 4.43,40 <= t <= 60摄氏度,I = 0.1 mol dm〜(-3)(NaClO_4)。反应通过水铂(II)阳离子之间的外球缔合进行和H_4L〜(2+),然后通过缓慢交换将外层转化为内球复合物。在25℃和I = 0.1 mol dm〜(-3)(NaClO_4)下的阴离子化速率常数为3.39 x 10〜(-4)s〜(-1),k_(an)路径的DELTA H和DELTA S为28.9 kJ mol〜(-1)和-214.4 JK〜(-1)mol〜(-1 )。铂(II)中心的阳极化反应遵循Ia路径。

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