Reactivity of M(en)Cl2 (M = PdII/PtII, en = 1,2-diaminoethane) with N,N′-bis(salicylidene)-p-phenylenediamine: Binding with hexafluorobenzene

Schiff base N,N′-bis(salicylidene)-p-phenylenediamine (LH2) complexed with Pt(en)Cl2 and Pd(en)Cl2 provided [Pt(en)L]2 · 4PF6 (1) and Pd(Salen) (2) (Salen = N,N′-bis(salicylidene)-ethylenediamine), respectively, which were characterized by their elemental analysis, spectroscopic data and X-ray data. A solid complex obtained by the reaction of hexafluorobenzene (hfb) with the representative complex 1 has been isolated and characterized as 3 (1 · hfb) using UV–Vis, NMR (1H, 13C and 19F) data. A solid complex of hfb with a reported Zn-cyclophane 4 has also been prepared and characterized 5 (4 · hfb) for comparison with complex 3. The association of hfb with 1 and 4 has also been monitored using UV–Vis and luminescence data.

Graphical abstractThe tetradentate Schiff base N,N′-bis(salicylidene)-p-phenylenediamine upon its complexation with Pd(en)Cl2 and Pt(en)Cl2 provides two different products. In the case of the PtII complex, (2 + 2) condensation provides a metallocyclophane which is found to bindan electron acceptor molecule like hexafluorobenzene, as monitored spectroscopically.Figure optionsDownload full-size imageDownload as PowerPoint slide