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Maisuls I, Boisten F, Hebenbrock M, Alfke J, Schürmann L, Jasper-Peter B, Hepp A, Esselen M, Müller J, Strassert CA. Monoanionic C^N^N Luminophores and Monodentate C-Donor Co-Ligands for Phosphorescent Pt(II) Complexes: A Case Study Involving Their Photophysics and Cytotoxicity. Inorg Chem 2022; 61:9195-9204. [PMID: 35666659 DOI: 10.1021/acs.inorgchem.2c00753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A family of Pt(II) complexes bearing monoanionic C^N^N ligands as luminophoric units as well as a set of monodentate ligands derived from allenylidene and carbene species were synthesized and characterized in terms of structure and photophysical properties. In addition, we present the extraordinary molecular structure of a phosphorescent complex carrying an allenylidene ligand. Depending on the co-ligand, an effect can be observed in the photoluminescence lifetimes and quantum yields as well as in the radiative and radiation less deactivation rate constants. Their correlation with the substitution pattern was analyzed by comparing the photoluminescence in fluid solution at room temperature and in frozen glassy matrices at 77 K. Moreover, in order to gain a deeper understanding of the electronic states responsible for the optical properties, density functional theory calculations were performed. Finally, the cytotoxicity of the complexes was evaluated in vitro, showing that the cationic complexes exhibit strong effects at low micromolar concentrations. The calculated half-maximum effective concentrations (EC50 values) were 4 times lower in comparison to the established antitumor agent oxaliplatin. In contrast, the neutral species are less toxic, rendering them as potential bioimaging agents.
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Affiliation(s)
- Iván Maisuls
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany.,CeNTech, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 11, Münster 48149, Germany.,Cells in Motion Interfaculty Centre (CiMIC) and Center for Soft Nanoscience (SoN), Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
| | - Felix Boisten
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
| | - Marian Hebenbrock
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
| | - Julian Alfke
- Institut für Lebensmittelchemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 45, Münster 48149, Germany
| | - Lina Schürmann
- Institut für Lebensmittelchemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 45, Münster 48149, Germany
| | - Beate Jasper-Peter
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
| | - Alexander Hepp
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
| | - Melanie Esselen
- Institut für Lebensmittelchemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 45, Münster 48149, Germany
| | - Jens Müller
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany.,Cells in Motion Interfaculty Centre (CiMIC) and Center for Soft Nanoscience (SoN), Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
| | - Cristian A Strassert
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany.,CeNTech, Westfälische Wilhelms-Universität Münster, Heisenbergstraße 11, Münster 48149, Germany.,Cells in Motion Interfaculty Centre (CiMIC) and Center for Soft Nanoscience (SoN), Westfälische Wilhelms-Universität Münster, Corrensstraße 30, Münster 48149, Germany
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