Bioactive and luminescent indole and isatin based gold(i) derivatives.

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ID: 42712
2019
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Abstract
A series of luminescent monometallic [AuL(PPh3)] (1-3) and bimetallic [Au2(μ-dppe)L2] (4, 6, 8) and [Au2(μ-dppp)L2] (5, 7, 9) complexes, where L is either 4-cyano-indole, isatin, or 5,7-dimethyl-isatin, and dppe and dppp are 1,2-bis(diphenylphosphino)ethane and 1,3-bis(diphenylphosphino)propane, respectively, have been synthesised. X-ray diffraction confirmed the tendency to establish aurophillic interations for those complexes containing dppe. Luminescence studies and theoretical calculations revealed a different origin for both families, i.e. indole and isatin species. Thus, indole derivatives presented a ligand-to-ligand-charge-transfer transition (LLCT) from the indole to the PPh3 fragment, whereas for the isatin derivatives an intraligand-charge-transfer transition (ILCT) within the isatin fragment is proposed. In both cases, the gold centre was slightly implicated as a ligand-to-metal-charge transfer transition (LMCT) (from the indole/isatin to Au(i)). Cell antiproliferative assays in lung cancer cells (A549), leukemia Jurkat-pLVTHM and Jurkat-shBak cells (cisplatin sensitive and resistant, respectively) showed excellent cytotoxic values (10.11-0.28 μM), showing the leukemia cells to be the most sensitive and the bimetallic species to be the most active agents. Preliminary studies associated the cytotoxicity with a combination of different factors, the metallic fragment being mainly responsible. Remarkably, these complexes are able to inhibit the cellular growth of cisplatin resistant Jurkat-shBak cells highlighting their promising future as an alternative anticancer agent.
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fernndezmoreira2019bioactivedalton Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Fernández-Moreira, Vanesa;Val-Campillo, Cynthia;Ospino, Isaura;Herrera, Raquel P;Marzo, Isabel;Laguna, Antonio;Gimeno, M Concepción;
Journal Dalton transactions (Cambridge, England : 2003)
Year 2019
DOI
10.1039/c8dt00298c
URL
Keywords
photodynamic therapy self-aggregation slipped cofacial geometry static quenching time-resolved fluorescence

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