The copper complexes [Cu4(μ‐L1)2(μ1, 1‐N3)2·(CH3O)2] (1) and [Cu4(μ‐L2)2(μ1, 1‐N3)2(N3)2]·(H2O)2 (2) [H2L1 = (1R,3S)‐N′,N′′‐bis[salicylidene]‐1, 3‐diamino‐1, 2, 2‐trimethylcyclopentane and H2L2 = (1R,3S)‐N′,N′′‐bis[5‐methylsalicylidene]‐1, 3‐diamino‐1, 2, 2‐trimethylcyclopentane] were synthesized and structurally characterized by elemental analyses, IR spectroscopy, and single crystal X‐ray diffraction. Both are tetranuclear complexes consisting of dinuclear copper moieties [Cu2L1]2+ or [Cu2L2]2+ connected by two end‐on azido bridges. Low temperature magnetic studies indicate that weak antiferromagnetic couple dominates in 1 and 2.

Abstract. Reaction of CuCl 2 ·2H 2 O with chiral Schiff bases and sodium dicyanamide led to the formation of two chiral copper(II) coordination polymers, namely [Cu 4 Both complexes were structurally characterized by elemental analyses, IR spectroscopy and single-crystal X-ray diffraction.

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.