Template synthesis and characterization of diaza dioxa macrocyclic nanosized cobalt(II) complex dispersed within nanocavity of zeolite-Y

Nanocavity microreactor containing 15- and 16-membered diaza dioxa Schiff-base cobalt(II) complexes “[Co(Et[15]N2O2)]2+, [Co(Pr[16]N2O2)]2+, [Co(Ph[15]N2O2)]2+ and [Co(Ch[15]N2O2)]2+” have been prepared by the template synthesis of diamine (1,2-diaminoethane, 1,3-diaminopropane, 1,2-diaminobenzene or 1,2-diaminocyclohexane) with [(1,3-bis(2-carboxyaldehydephenoxy)propane)cobalt]2+;[Co(BCAPP)]2+@NaY within the pores of zeolite-Y. The nanosized cobalt(II) complex were entrapped in the supercage of Y-zeolite by a three-step process in the liquid phase: (i) exchange of Co(II) ions with NaY in water solution, (ii) reaction of Co(II)–NaY with excess BCAPP in methanol; [Co(BCAPP)]2+@NaY; (iii) template synthesis of [Co(BCAPP)]2+@NaY with diamine. The new nanosized complex entrapped in the nanocavity of zeolite Y was characterized by several techniques: chemical analysis and spectroscopic methods (FT-IR, UV–Vis, XRD, BET, DRS, XPS, TGA).

This study focuses on the preparation and characterization of zeolite framework stabilized nanosized cobalt(II) complex with 15- and 16-membered diaza dioxa macrocyclic ligand. These complexes were entrapped in the supercage of Y-zeolite by a three-step process in the liquid phase: (i) exchange of Co(II) ions with NaY in water solution, (ii) reaction of Co2+@NaY with excess 1,3-bis(2-carboxyaldehydephenoxy)propane (O2O2) in methanol; [(1,3-bis(2-carboxyaldehydephenoxy)propane)cobalt]2+@NaY, [Co(O2O2)]2+@NaY (iii) template synthesis of [Co(O2O2)]2+@NaY with diamine (1,2-diaminoethane, 1,3-diaminopropane, 1,2-diaminobenzene or 1,2-diaminocyclohexane). The new nanosized complexes were thoroughly characterized by ICP-OES, FT-IR, XRD, BET, XPS, UV–Vis spectroscopy.Figure optionsDownload as PowerPoint slide