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The Homoleptic Curcumin-Copper Single Crystal (ML₂): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.

ABSTRACT: The first single crystal structure of the homoleptic copper (II) ML₂ complex (M=Cu (II), L = curcumin) was obtained and its structure was elucidated by X-ray diffraction showing a square planar geometry, also confirmed by EPR. The supramolecular arrangement is supported by C-H···O interactions and the solvent (MeOH) plays an important role in stabilizing the crystal packing Crystallinity was additionally assessed by XRD patterns. The log P value of the complex (2.3 ± 0.15) was determined showing the improvement in water solubility. The cytotoxic activity of the complex against six cancer cell lines substantially surpasses that of curcumin itself, and it is particularly selective against leukemia (K562) and human glioblastoma (U251) cell lines, with similar antioxidant activity to BHT. This constitutes the first crystal structure of pristine curcumin complexed with a metal ion.

SUBMITTER: Arenaza-Corona A

PROVIDER: S-EPMC10458717 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature

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The Homoleptic Curcumin-Copper Single Crystal (ML<sub>2</sub>): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.

Arenaza-Corona Antonino A Obregón-Mendoza Marco A MA Meza-Morales William W Ramírez-Apan María Teresa MT Nieto-Camacho Antonio A Toscano Rubén A RA Pérez-González Leidys L LL Sánchez-Obregón Rubén R Enríquez Raúl G RG

Molecules (Basel, Switzerland) 20230812 16

The first single crystal structure of the homoleptic copper (II) ML<sub>2</sub> complex (M=Cu (II), L = curcumin) was obtained and its structure was elucidated by X-ray diffraction showing a square planar geometry, also confirmed by EPR. The supramolecular arrangement is supported by C-H···O interactions and the solvent (MeOH) plays an important role in stabilizing the crystal packing Crystallinity was additionally assessed by XRD patterns. The log P value of the complex (2.3 ± 0.15) was determi ...[more]

PMID: 37630284

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Project description:Different synthetic methods have been developed to prepare eight new redox-active pincer-type ligands, H(X,Y), that have pyrazol-1-yl flanking donors attached to an ortho-position of each ring of a diarylamine anchor and that have different groups, X and Y, at the para-aryl positions. Together with four previously known H(X,Y) ligands, a series of 12 Ni(X,Y)2 complexes were prepared in high yields by a simple one-pot reaction. Six of the 12 derivatives were characterized by single-crystal X-ray diffraction, which showed tetragonally distorted hexacoordinate nickel(II) centers. The nickel(II) complexes exhibit two quasi-reversible one-electron oxidation waves in their cyclic voltammograms, with half-wave potentials that varied over a remarkable 700 mV range with the average of the Hammett σ(p) parameters of the para-aryl X, Y groups. The one- and two-electron oxidized derivatives [Ni(Me,Me)2](BF4)n (n = 1, 2) were prepared synthetically, were characterized by X-band EPR, electronic spectroscopy, and single-crystal X-ray diffraction (for n = 2), and were studied computationally by DFT methods. The dioxidized complex, [Ni(Me,Me)2](BF4)2, is an S = 2 species, with nickel(II) bound to two ligand radicals. The mono-oxidized complex [Ni(Me,Me)2](BF4), prepared by comproportionation, is best described as nickel(II) with one ligand centered radical. Neither the mono- nor the dioxidized derivative shows any substantial electronic coupling between the metal and their bound ligand radicals because of the orthogonal nature of their magnetic orbitals. On the other hand, weak electronic communication occurs between ligands in the mono-oxidized complex as evident from the intervalence charge transfer (IVCT) transition found in the near-IR absorption spectrum. Band shape analysis of the IVCT transition allowed comparisons of the strength of the electronic interaction with that in the related, previously known, Robin-Day class II mixed valence complex, [Ga(Me,Me)2](2+).

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The Homoleptic Curcumin-Copper Single Crystal (ML₂): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.

Publications

The Homoleptic Curcumin-Copper Single Crystal (ML<sub>2</sub>): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.

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The Homoleptic Curcumin-Copper Single Crystal (ML2): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.

Publications

The Homoleptic Curcumin-Copper Single Crystal (ML<sub>2</sub>): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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The Homoleptic Curcumin-Copper Single Crystal (ML₂): A Long Awaited Breakthrough in the Field of Curcumin Metal Complexes.