Formation of dinuclear macrocyclic and mononuclear acyclic complexes of a new trinucleating hexaaza triphenolic Schiff base macrocycle: structure and NLO properties

Reaction of a new chiral and optically active trinucleating 3+3 condensed hexaaza triphenolic Schiff base macrocycle H3L1 I with transition metal ions (Zn, Cu, Ni, Co, Fe and Mn) in 1:3 molar ratio in methanol under reflux conditions resulted in complexes. Analytical data reveal the formation of 2+2 condensed dinuclear macrocyclic Schiff base complexes, instead of the expected trinuclear macrocyclic complexes. X-Ray crystallographic studies on three of these complexes established their dinuclearity. On the other hand, reaction of I with metal ions (Zn, Cu, Fe and Mn) in 1:3 molar ratio in methanol at room temperature for 2 h resulted in one-side condensed mononuclear acyclic complexes. This is confirmed by the crystal structure of the manganese complex. Second-order non-linear properties are discussed.