Abstract
Three manganese macrocyclic complexes of two anionic N-4-donor [1+1] Schiff-base macrocycles that differ in ring size (14 versus 16 membered), HLEt and HLPr (obtained from condensation of diphenylamine-2,2'-dicarboxaldehyde and either diethylenetriamine or dipropylenetriamine), are reported. Specifically, a pair of monomeric complexes (MnLEt)-L-II(NCS)(H2O) and [(MnLPr)-L-III(NCS)(2)]0.5H(2)O, plus a dimeric complex [(Mn2L2Et)-L-IV(O)(2)](ClO4)(2)3DMF have been synthesised and characterised. Single crystal structure determinations on [(MnLPr)-L-III(NCS)(2)]0.5H(2)O and [(Mn2L2Et)-L-IV(O)(2)](ClO4)(2)3DMF revealed octahedral manganese centres in both cases: N-6-coordinated Jahn-Teller distorted Mn-III in the former and a pair of N4O2-coordinated Mn-IV in the latter. UV-Vis, IR, and electron paramagnetic resonance spectroscopy as well as magnetic measurements are reported. These macrocyclic complexes feature a simple and original design, and could find future uses as models for manganese catalase or as building blocks for the assembly of larger supramolecular architectures.