Synthesis and Crystal Structure of Salen Ligands Derived from Unsymmetrical Vicinal Diamine

A. Gayathri1, T. Vidhyasagar1 and K. Rajeswari2

1Department of Chemistry, Annamalai University, Annamalai Nagar-608002, INDIA. 2PG & Research Department of Chemistry, Government College for Women (A), Kumbakonam 612 001, INDIA.


Salen type Schiff bases possessing an unsymmetrical vicinal diamine backbone are promising nominees in view of their diversified applications. Synthesis of such Schiff bases viz., 2'-((1E,1'E)-((1-phenylpropane-1,2-diyl)bis(azanylylidene)) bis(methanylylidene))diphenol and 2,2'-((1E,1'E)-((1-(p-tolyl)propane-1,2-diyl) bis (azanylylidene))bis(methanylylidene))diphenol were achieved. Their single crystals were developed using ethanol as solvent by slow evaporation technique and subjected for XRD-studies. Interestingly, both the crystals crystallize with similar pattern i.e., in triclinic crystal system with space group P-1 and both found to have E-configuration at each imine bond. XRD data reveals the molecular structure of both the compounds exhibit similar intra & inter- molecular hydrogen bonding interactions.

Keywords :Crystal structure, Unsymmetrical vicinal diamines, Salen ligand, Schiff base, CCDC: 1448832 & 1448833.