Synthesis and Structural Characterization of Two New Schiff Bases incorporating a Piperazine Skeleton, and their Reactions with Copper(II) Perchlorate

The synthesis of Schiff bases N,N′‐bis(4‐dodecyloxy‐benzylidene‐N‐propyl)‐piperazine (2) and N,N′‐bis‐[4‐(4′‐octyloxy‐benzoic)‐ester‐benzylidene‐N‐propyl]‐piperazine (6) in a multistep process is reported. The intermediates as well as the products were characterized by elemental analysis, melting point and IR, ¹H and ¹³C‐NMR spectroscopy. The complex formation of these Schiff bases with copper(II) perchlorate resulted in disruption of the imino bond and yielded N,N′‐bis(3‐aminopropyl)piperazineperchloratocopper(II) perchlorate, Cu(L)(ClO₄)₂, where L stands for N,N′‐bis(3‐aminopropyl‐)piperazine. The nature of the complex is established by elemental analyses, IR and Raman spectroscopy and its structure by X‐ray diffraction measurements. The mesomorphic ordering of the ligands have been checked.

Keywords:

• copper(II) complex
• perchlorat complex
• Schiff base
• spectral properties

Thanks for financial support are due to the “Fonds zur Förderung der Wissenschaftlichen Forschung in Österreich” (Project 19335‐N17).