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Villaman D, Vega A, Santa Maria de la Parra L, León IE, Levín P, Toro PM. Anticancer activity of Ni(II) and Zn(II) complexes based on new unsymmetrical salophen-type ligands: synthesis, characterization and single-crystal X-ray diffraction. Dalton Trans 2023; 52:10855-10868. [PMID: 37486008 DOI: 10.1039/d3dt00800b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
The discovery of new coordination compounds with anticancer properties is an active field of research due to the severe side effects of platinum-based compounds currently used in chemotherapy. In the search for new agents for the treatment of cancer, unsymmetrical N2O2-tetradentate ligand (H2L1 and H2L2) and their Ni(II) and Zn(II) asymmetric complexes (NiII-L1-2 and ZnII-L1-2) have been synthesized and fully characterized. 1H NMR studies revealed that the ligands and complexes were stable in mixtures of DMSO : D2O (9 : 1). Complementary UV-Vis studies confirmed that ZnII derivatives also exhibit high stability in mixtures DMSO : buffer (6 : 4) after 24 h. Single-crystal X-ray diffraction studies confirmed the molecular structures of H2L1, H2L2, NiII-L1, and NiII-L2. At the molecular level, complexes were completely planar without significant distortions of the square-planar geometry according to τ4 parameter. Furthermore, the crystalline structures revealed non-classical intermolecular interactions of the C-H⋯O and the Ni⋯Ni type. The ligands and complexes were screened against the human osteosarcoma (MG-63), human colon cancer (HCT-116), breast cancer (MDA-MB-231) cell lines, and non-cancerous cells (L929). H2L1 and H2L2 ligands not caused cytotoxic effects at a concentration of 100 μM, while NiII-L2, ZnII-L1, and ZnII-L2 complexes induce cytotoxic effects in all cell lines. NiII-L2 was a more active complex against MG-63 (3.9 ± 1.5) and HCT-116 (3.4 ± 1.7) cell lines with IC50 values in the low micromolar range. In addition, this compound was 10-, 5-, and 11-fold more potent than cisplatin in MG-63 (39 ± 1.8), HCT-116 (17.2), and MDA-MB-231 (131 ± 18), respectively. Three complexes exhibited great selectivity for tumoral cells with SI values ranging from 1.6 to 7.4.
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Affiliation(s)
- David Villaman
- Laboratorio de Química Inorgánica y Organometálica, Facultad de Cs. Química, Universidad de Concepción, Chile.
| | - Andrés Vega
- Universidad Andrés Bello, Facultad de Ciencias Exactas, Departamento de Ciencias Químicas, Av. República 498, Santiago, Chile
| | - Lucía Santa Maria de la Parra
- CEQUINOR (UNLP, CCT-CONICET La Plata, Asociado a CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 No. 1465, La Plata 1900, Argentina
| | - Ignacio E León
- CEQUINOR (UNLP, CCT-CONICET La Plata, Asociado a CIC), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Blvd. 120 No. 1465, La Plata 1900, Argentina
- Cátedra de Fisiopatología, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, La Plata 1900, Argentina
| | - Pedro Levín
- Departamento de Química de los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Av. Libertador Bernardo O'Higgins 3363, Estación Central, Santiago, Chile
| | - Patricia M Toro
- Instituto de Ciencias Aplicadas, Facultad de Ingeniería, Universidad Autónoma de Chile, Talca, Chile.
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Dürrmann A, Hörner G, Wagner S, Breuning M, Weber B. Sterically Encumbered Coordination Sites. Iron(II) Complexes of Jäger‐type ligands with a Terphenyl Backbone. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Andreas Dürrmann
- Department of Chemistry Inorganic Chemistry University of Bayreuth Universitätsstraße 30, NWI 95440 Bayreuth Germany
| | - Gerald Hörner
- Department of Chemistry Inorganic Chemistry University of Bayreuth Universitätsstraße 30, NWI 95440 Bayreuth Germany
| | - Stefan Wagner
- Department of Chemistry Organic Chemistry University of Bayreuth Universitätsstraße 30, NWII 95440 Bayreuth Germany
| | - Matthias Breuning
- Department of Chemistry Organic Chemistry University of Bayreuth Universitätsstraße 30, NWII 95440 Bayreuth Germany
| | - Birgit Weber
- Department of Chemistry Inorganic Chemistry University of Bayreuth Universitätsstraße 30, NWI 95440 Bayreuth Germany
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Schönfeld S, Bauer W, Thallmair S, Hörner G, Weber B. Running in the Family: Molecular Factors controlling Spin Crossover of Iron(II) Complexes with Schiff‐base like Ligands. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202000409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Sophie Schönfeld
- Department of Chemistry University of Bayreuth Universitätsstraße 30 NWI 95440 Bayreuth Germany
| | - Wolfgang Bauer
- Department of Chemistry University of Bayreuth Universitätsstraße 30 NWI 95440 Bayreuth Germany
| | - Sebastian Thallmair
- Department of Chemistry University of Bayreuth Universitätsstraße 30 NWI 95440 Bayreuth Germany
- Present address: Frankfurt Institute for Advanced Studies Ruth-Moufang-Straße 1 60438 Frankfurt am Main Germany
| | - Gerald Hörner
- Department of Chemistry University of Bayreuth Universitätsstraße 30 NWI 95440 Bayreuth Germany
| | - Birgit Weber
- Department of Chemistry University of Bayreuth Universitätsstraße 30 NWI 95440 Bayreuth Germany
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Kurz H, Schötz K, Papadopoulos I, Heinemann FW, Maid H, Guldi DM, Köhler A, Hörner G, Weber B. A Fluorescence-Detected Coordination-Induced Spin State Switch. J Am Chem Soc 2021; 143:3466-3480. [PMID: 33636077 DOI: 10.1021/jacs.0c12568] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The response of the spin state to in situ variation of the coordination number (CISSS) is a promising and viable approach to smart sensor materials, yet it suffers to date from insensitive detection. Herein, we present the synthetic access to a family of planar nickel(II) complexes, whose CISSS is sensitively followed by means of fluorescence detection. For this purpose, nickel(II) complexes with four phenazine-based Schiff base-like ligands were synthesized and characterized through solution-phase spectroscopy (NMR and UV-vis), solid-state structure analysis (single-crystal XRD), and extended theoretical modeling. All of them reveal CISSS in solution through axial ligating a range of N- and O-donors. CISSS correlates nicely with the basicity of the axial ligand and the substitution-dependent acidity of the nickel(II) coordination site. Remarkably, three out of the four nickel(II) complexes are fluorescent in noncoordinating solvents but are fluorescence-silent in the presence of axial ligands such as pyridine. As these complexes are rare examples of fluorescent nickel(II) complexes, the photophysical properties with a coordination number of 4 were studied in detail, including temperature-dependent lifetime and quantum yield determinations. Most importantly, fluorescence quenching upon adding axial ligands allows a "black or white", i.e. digital, sensoring of spin state alternation. Our studies of fluorescence-detected CISSS (FD-CISSS) revealed that absorption-based CISSS and FD-CISSS are super proportional with respect to the pyridine concentration: FD-CISSS features a higher sensitivity. Overall, our findings indicate a favored ligation of these nickel(II) complexes in the excited state in comparison to the ground state.
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Affiliation(s)
- Hannah Kurz
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany
| | - Konstantin Schötz
- Soft Matter Optoelectronics, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany
| | - Ilias Papadopoulos
- Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Physical Chemistry I, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058 Erlangen, Germany
| | - Frank W Heinemann
- Inorganic Chemistry, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Harald Maid
- Organic Chemistry II, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger-Straße 10, 91058 Erlangen, Germany
| | - Dirk M Guldi
- Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Physical Chemistry I, Friedrich-Alexander-University Erlangen-Nürnberg (FAU), Egerlandstraße 3, 91058 Erlangen, Germany
| | - Anna Köhler
- Soft Matter Optoelectronics, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany.,Bayreuth Institute of Macromolecular Research (BIMF) and Bavarian Polymer Institute (BPI), University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany
| | - Gerald Hörner
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany
| | - Birgit Weber
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstraße 30, NW I, 95447 Bayreuth, Germany
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Kurz H, Hörner G, Weber B. An Iron(II) Spin Crossover Complex with a Maleonitrile Schiff base‐like Ligand and Scan Rate‐dependent Hysteresis above Room Temperature. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202000407] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Hannah Kurz
- Department of Chemistry University of Bayreuth Universitätsstraße 30, NWI 95447 Bayreuth Germany
| | - Gerald Hörner
- Department of Chemistry University of Bayreuth Universitätsstraße 30, NWI 95447 Bayreuth Germany
| | - Birgit Weber
- Department of Chemistry University of Bayreuth Universitätsstraße 30, NWI 95447 Bayreuth Germany
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