Synthesis, characterization, and structures of two new tetranuclear copper complexes with azido/dicyanamide bridges containing chiral Schiff base ligand

Abstract

Two new copper complexes [Cu 4 (µ L) 2 (µ 1,1 N 3 ) 2 (N 3 ) 2 ] (I) and [Cu 4 (µ L) 2 (µ 1,5 Dca) 2 (Dca) 2 ] (II) (H 2 L = (1R,3S) N',N'' bis[5 methoxysalicylidene] 1,3 diamino 1,2,2 trimethylcyclopentane, Dca = dicyanamide ions) were synthesized and structurally characterized by elemental analyses, IR spectroscopy and single crystal X ray diffraction (CIF files CCDC nos. 1013673 (I), 1013672 (II)). The two complexes crystallize in monoclinic P2 1 /c and triclinic space group, respectively. Both the complexes consist of two crystallographically independent copper ions connected by a double phenoxo bridges, which are further linked to the other symmetry related half of the molecule by two end on azido bridges or µ 1,5 dca groups.