Selective binding of benzoquinone with a Pt^II-cyclophane constructed on the skeleton of<i style=""> N,N'</i>-bis(salicylidene)-<i style="">p</i>-phenylenediamine: Synthesis and spectroscopic studies

Abstract

The Schiff base <i style="">N,N'</i>-bis(salicylidene)-<i style="">p</i>-phenylenediamine has been complexed with Pt(en)Cl₂ and the resulting Pt^II-cyclophane, [Pt(en)L]₂·4PF₆, reacted with<b style=""> </b>phenol, resorcinol, hydroquinone or benzoquinone in DMSO solution. Their binding has been<b style=""> </b>monitored by the variation in the corresponding UV-visible and emission spectral patterns. The binding properties are compared with the earlier reported Zn^II-cyclophane [Zn(bpy)L]₂ (bpy = 2,2'-bipyridine). A few solid adducts of phenol and benzoquinone with the Pt^II-cyclophane complex and hydroquinone as well as that of resorcinol with the Zn-cyclophane have also been synthesized and characterized.