Metal Ion Promoted Synthesis of Hexaaza[17]paracyclophane Derived from Terephthalaldehyde Involving Co(II), Ni(II), Cu(II), and Zn(II) and Their Physico‐chemical Properties

Abstract

Schiff base type mononuclear complexes of hexaaza[17]paracyclophane [MLX₂] [M = Co(II), Ni(II), Cu(II), and Zn(II); X = Cl or NO₃] have been synthesized by the template condensation reaction of terephthalaldehyde, diethylenetriamine, and formaldehyde in 1:1:2:1 molar ratio in methanol. The FT‐IR, ¹H NMR, and ¹³C NMR data indicate that not all of the nitrogen atoms of the macrocyclic ring are coordinated to the metal centre. The reflectance spectra of the solid complexes were recorded confirming the penta‐coordinated geometry around the metal centre. However, the electronic spectra suggested their octahedral environment due to the presence of strongly coordinating solvent DMSO. The magnetic moment values confirm that all of the macrocyclic complexes are high‐spin.

Keywords:

• Hexaaza[17]paracyclophane
• Terephthaladehyde
• Macrocycles
• Ligands

Acknowledgments

The Chairman, Department of Chemistry, AMU is acknowledged for providing the necessary facilities. Dr. M. Yamin Siddiqui, College of Science, King Saud University, Riyadh, is acknowledged for providing elemental analysis data, FT‐IR, and NMR studies. The authors are also thankful to the University Grant Commission New Delhi, India Project No. F.12‐116/2001 for financial support.