CoII and CuII Fluorescent Complexes with Acridine-Based Ligands

The condensation reaction of salicylaldehyde or 2-hydroxynaphthaldehyde with a diamino organic group (Acridine Yellow or diaminoacridine) resulted in the Schiff-base ligands ACRI-1, ACRI-2 and ACRI-3, with the last two hitherto unknown. Fluorescent ACRI-1, ACRI-2 and ACRI-3 were designed to provide iminophenolic binding pockets for two transition metals and ferromagnetic exchange between the metals. Following our report on the complex [Co-2(ACRI-1)(2)] (1Co), we report herein the reactions of ACRI-1, ACRI-2 and ACRI-3 with Co-II and Cu-II salts, which afforded the new fluorescent complexes [Cu-2(ACRI-1)(2)] (1Cu), [Co-2(ACRI-2)(2)] (2Co), [Cu-2(ACRI-2)(2)] (2Cu), [Co-2(ACRI-3)(2)(H2O)(4)] (3Co) and [Cu-2(ACRI-3)(2)] (3Cu).