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Keywords:

  • Chiral Schiff base;
  • Copper;
  • Crystal structures;
  • Magnetic properties;
  • Azido bridges

Abstract

The copper complexes [Cu4(μ-L1)21, 1-N3)2·(CH3O)2] (1) and [Cu4(μ-L2)21, 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.