Tetradentate Schiff bases N,N'–Bis (salicylidene)–p–phenylenediamine (LH2), N,N'–Bis(salicylidene)-benzidine, (L'H2) and their dimetallic complexes [Cu bpy L]2. 4DMSO. 2H2O (1), [Cu bpy L']2. 3DMSO (2), [ZnbpyL]2. DMSO. H2O (3) and [ZnbpyL']2. 0.5DMSO (4), bpy=2,2'-bipyridine were prepared and characterized by their elemental analysis ,FAB-mass, IR, NMR, UV-Vis, ESR (Cu(II)only) spectra and magnetic-moment data. Force field calculation reveal highly distorted octahedral environment around both the metal centers. The two Cu(II) centers are separated by 8.63 Å from each other which is large enough to disallow any electronic interaction between them .The two metal centers along with the spacer groups constitute an elongated hexagon with a void inside .Four phenol molecules bind with a representative Zn (II) complex of LH2 was considered as a novel guest in view of the possibility of its binding either inside or outside cavity of the macrocyclic frame.
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