STUDIES ON STEPWISE STABILITY CONSTANTS OF COORDINATION COMPOUNDS FROM SULFONATED SHEOAK TANNIN WITH METAL IONS

The stepwise stability constants of coordination compounds from sulfonatedsheoak tannin with metal ions have been determined by pH potential method with catechol asmodel compounds at 20℃and constant ionic strength.

磺化木麻黄单宁配合物稳定常数的研究

磺化木麻黄单宁由木麻黄单宁经磺化处理而制得.用pH电位法测得其加质子常数及其与Ca^(2+)、Mn^(2+)、Zn^(2+)、Cu^(2+)、Fe^(3+)等金属离子配合物的稳定常数.横化木麻黄单宁的加质子常数略小于木麻黄单宁但配位能力却远远高于木麻黄单宁.

磺化木麻黄单宁金属配合物逐级稳定常数的研究

以邻苯二酚为模型化合物,在室温及恒定的离子强度条件下,用pH电位法,测定了磺化木麻黄单宁与Ca^(2+)、Mn^(2+)、Zn^(2+)、Fe^(3+)等金属离子所形成的配合物(ML_n)的逐级稳定常数。各级稳定常数间有如下规律:lgK_1>lgK_2>lgK_3>lgK_4。