Synthesis, crystal structures and characterization of two Cu(II) complexes with asymmetric sulfonamide Schiff-base ligands

Abstract

Reaction of the N-tosyl-1,2-diaminopropane or N-tosyl-1,2-diaminobenzene with salicylaldehyde forms two new asymmetric sulfonamide Schiff bases, N-[2-(2-hydroxybenzylideneamino)propyl]-4-methylbenzenesulfonamide (H₂L¹ ) and N-[2-(2-hydroxybenzylideneamino)phenyl]-4-methylbenzenesulfonamide (H₂L² ). Two new complexes [CuL ^x (H₂O)] (x = 1 for 1, x = 2 for 2) constructed from H₂L ^x have been prepared and characterized via X-ray single-crystal diffraction, elemental analysis, FT-IR, UV-Vis, TGA, quantum chemical calculations, and photoluminescence measurements. Weak C–H ··· π, hydrogen bonds, π–π, and Cu ··· O weak interactions lead to 3-D supramolecular architecture, 1, and 1-D double chain, 2.

Keywords:

• N-tosyl-1,2-propanediamine
• N-tosyl-o-phenyldiamine
• Sulfonamide Schiff base
• Quantum chemical calculation
• Fluorescence

Acknowledgment

We thank the National Natural Science Foundation of China (Nos. 20801033 and 20871079).