A diamine derivative expressed by the following general formula (I): ##STR1## wherein R.sup.1 and R.sup.2 stand, independently from each other, for a hydrogen atom, an alkyl group, an aralkyl group or an aryl group. The diamide derivative is useful as an ionophore which can selectively transport cupric ions through liquid membranes.
下列一般式(I)所表示的二胺衍
生物: ##STR1## 其中R.sup.1和R.sup.2分别独立地代表氢原子、烷基、芳基烷基或芳基基团。该二酰胺衍
生物可用作离子载体,可通过液态膜有选择性地传输
铜离子。