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Synthesis and Characterization of Ru(II) Complexes with ?-Expansive Imidazophen Ligands for the Photokilling of Human Melanoma Cells.


ABSTRACT: Ru(II) complexes were synthesized with ?-expanding (phenyl, fluorenyl, phenanthrenyl, naphthalen-1-yl, naphthalene-2-yl, anthryl and pyrenyl groups) attached at a 1H-imidazo[4,5-f][1,10]phenanthroline ligand and 4,4'-dimethyl-2,2'-bipyridine (4,4'-dmb) coligands. These Ru(II) complexes were characterized by 1D and 2D NMR, and mass spectroscopy, and studied for visible light and dark toxicity to human malignant melanoma SK-MEL-28 cells. In the SK-MEL-28 cells, the Ru(II) complexes are highly phototoxic (EC50  = 0.2-0.5 µm) and have low dark toxicity (EC50  = 58-230 µm). The highest phototherapeutic index (PI) of the series was found with the Ru(II) complex bearing the 2-(pyren-1-yl)-1H-imidazo[4,5-f][1,10]phenanthroline ligand. This high PI is in part attributed to the ?-rich character added by the pyrenyl group, and a possible low-lying and longer-lived 3 IL state due to equilibration with the 3 MLCT state. While this pyrenyl Ru(II) complex possessed a relatively high quantum yield for singlet oxygen formation (??  = 0.84), contributions from type-I processes (oxygen radicals and radical ions) are competitive with the type-II (1 O2 ) process based on effects of added sodium azide and solvent deuteration.

SUBMITTER: Ghosh G 

PROVIDER: S-EPMC7138724 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Synthesis and Characterization of Ru(II) Complexes with π-Expansive Imidazophen Ligands for the Photokilling of Human Melanoma Cells.

Ghosh Goutam G   Yin Huimin H   Monro Susan M A SMA   Sainuddin Tariq T   Lapoot Lloyd L   Greer Alexander A   McFarland Sherri A SA  

Photochemistry and photobiology 20200109 2


Ru(II) complexes were synthesized with π-expanding (phenyl, fluorenyl, phenanthrenyl, naphthalen-1-yl, naphthalene-2-yl, anthryl and pyrenyl groups) attached at a 1H-imidazo[4,5-f][1,10]phenanthroline ligand and 4,4'-dimethyl-2,2'-bipyridine (4,4'-dmb) coligands. These Ru(II) complexes were characterized by 1D and 2D NMR, and mass spectroscopy, and studied for visible light and dark toxicity to human malignant melanoma SK-MEL-28 cells. In the SK-MEL-28 cells, the Ru(II) complexes are highly phot  ...[more]

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