{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,19]],"date-time":"2026-07-19T02:46:44Z","timestamp":1784429204332,"version":"3.55.0"},"reference-count":61,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2021,12,1]],"date-time":"2021-12-01T00:00:00Z","timestamp":1638316800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100010096","name":"Secretariat of Public Education","doi-asserted-by":"publisher","award":["Promep\/103.5\/11\/4462"],"award-info":[{"award-number":["Promep\/103.5\/11\/4462"]}],"id":[{"id":"10.13039\/100010096","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003141","name":"Consejo Nacional de Ciencia y Tecnolog\u00eda","doi-asserted-by":"publisher","award":["Beca doctorado Karla Alejandra Lopez Gastelum"],"award-info":[{"award-number":["Beca doctorado Karla Alejandra Lopez Gastelum"]}],"id":[{"id":"10.13039\/501100003141","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>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\u2032-hydroxy-5\u2032-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\u2032-hydroxy-5\u2032-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%).<\/jats:p>","DOI":"10.3390\/molecules26237301","type":"journal-article","created":{"date-parts":[[2021,12,2]],"date-time":"2021-12-02T02:40:02Z","timestamp":1638412802000},"page":"7301","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Mononuclear and Tetranuclear Copper(II) Complexes Bearing Amino Acid Schiff Base Ligands: Structural Characterization and Catalytic Applications"],"prefix":"10.3390","volume":"26","author":[{"given":"Karla-Alejandra","family":"L\u00f3pez-Gast\u00e9lum","sequence":"first","affiliation":[{"name":"Departamento de Investigaci\u00f3n en Pol\u00edmeros y Materiales, Universidad de Sonora, Rosales and Luis Encinas s\/n, Col. 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Mexiquense s\/n esquina Av. Universidad Polit\u00e9cnica, Col. Villa Esmeralda, Tultitlan 54910, Estado de M\u00e9xico, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8730-3546","authenticated-orcid":false,"given":"Fernando","family":"Rocha-Alonzo","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Qu\u00edmico Biol\u00f3gicas, Universidad de Sonora, Calle Rosales y Blvd. Luis Encinas s\/n, Col. Centro, Hermosillo 83000, Sonora, Mexico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100129","DOI":"10.1016\/j.rechem.2021.100129","article-title":"Synthesis, cytotoxic, anticancer and antimicrobial activities of some metal complexes of a novel tetradentate Schiff base ligand, (E)-3-((2-((E)-(1-(2-hydroxyphenyl)ethylidene)amino)ethyl)imino)-N-phenylbutanamide","volume":"3","author":"Aravindakshan","year":"2021","journal-title":"Results Chem."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Garba, H.W., Abdullahi, M.S., Shazwan, M., Jamil, S., and Endot, N.A. (2021). Efficient Catalytic Reduction of 4-Nitrophenol Using Copper ( II ) Complexes wth N,O-Chelating Schiff Base Ligands. 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