Synthesis, Structures, and Magnetic Properties of Two Tetranuclear Copper Complexes with End‐on Azido and Phenoxo Bridges Containing Chiral Schiff Base Ligands

The copper complexes [Cu 4 (μ‐L 1 ) 2 (μ 1, 1 ‐N 3 ) 2 · (CH 3 O) 2 ] ( 1 ) and [Cu 4 (μ‐L 2 ) 2 (μ 1, 1 ‐N 3 ) 2 (N 3 ) 2 ] · (H 2 O) 2 ( 2 ) [H 2 L 1 = (1 R ,3 S )‐ N ′, N ′′‐bis[salicylidene]‐1, 3‐diamino‐1, 2, 2‐trimethylcyclopentane and H 2 L 2 = (1 R ,3 S )‐ 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 [Cu 2 L 1 ] 2+ or [Cu 2 L 2 ] 2+ connected by two end‐on azido bridges. Low temperature magnetic studies indicate that weak antiferromagnetic couple dominates in 1 and 2 .