期刊
MOLECULES
卷 26, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/molecules26237301
关键词
copper complex; polynuclear complex; metallocyclic cyclopropanation; amino acid ligand; glycine ligand
资金
- Consejo Nacional de Ciencia y Tecnologia (CONACYT, Mexico)
- Mexico's Secretaria de Educacion Publica (SEP) [Promep/103.5/11/4462]
The synthesis of two new glycine-Schiff base copper(II) complexes and the determination of their structures have revealed different solid-state arrangements, both showing high diastereoselectivity. These findings are significant for molecular design and organic synthesis.
Two new glycine-Schiff base copper(II) complexes were synthesized. Single crystal X-ray diffraction (SCXRD) allowed us to establish the structure of both complexes in the solid state. The glycine-Schiff base copper(II) complex derived from 2 '-hydroxy-5 '-nitroacetophenone showed a mononuclear hydrated structure, in which the Schiff base acted as a tridentate ligand, and the glycine-Schiff base copper(II) complex derived from 2 '-hydroxy-5 '-methylacetophenone showed a less common tetranuclear anhydrous metallocyclic structure, in which the Schiff base acted as a tetradentate ligand. In both compounds, copper(II) had a tetracoordinated square planar geometry. The results of vibrational, electronic, and paramagnetic spectroscopies, as well as thermal analysis, were consistent with the crystal structures. Both complexes were evaluated as catalysts in the olefin cyclopropanation by carbene transference, and both led to very high diastereoselectivity (greater than 98%).
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