Synthesis and crystal structures of magnesium complexes with NNO Schiff base ligands bearing quinolyl pendant donors

A series of ketoimines bearing quinolyl pendants was prepared through Schiff base condensation of 1,3-diketones (2,4-pentanedione, benzoylmethane, and 1-benzoylacetone) and 8-aminoquinoline or 8-amino-2-methylquinoline. The ketoimines were isolated in 46–90% yield and characterized spectroscopically and crystallographically. Reaction of the ketoimines with magnesium 4-methylbenzylalkoxide yielded octahedral magnesium complexes in 67–90% yield. The spectroscopic and crystallographic properties of the magnesium complexes were explored. Structures of 1, 4, 8, 10, and 11 are reported.

Graphical abstractA series of ketoimines bearing quinolyl pendants was prepared through Schiff base condensation of 1,3-diketones with 8-aminoquinolines. Reaction of the ketoimines with magnesium 4-methylbenzylalkoxide yielded magnesium complexes possessing a distorted octahedral geometry. The spectroscopic and crystallographic properties of the ketoimines and the magnesium complexes are reported.Figure optionsDownload full-size imageDownload as PowerPoint slide