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

Reaction of a new chiral and optically active trinucleating 3+3 condensed h exaaza 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 co nditions resulted in complexes. Analytical data reveal the formation of 2+2 condensed dinuclear macrocyclic Schiff base complexes, instead of the expe cted trinuclear macrocyclic complexes. X-Ray crystallographic studies on th ree of these complexes established their dinuclearity. On the other hand, r eaction of I with metal ions (Zn, Cu, Fe and Mn) in 1:3 molar ratio in meth anol at room temperature for 2 h resulted in one-side condensed mononuclear acyclic complexes. This is confirmed by the crystal structure of the manga nese complex. Second-order non-linear properties are discussed.