Photocytotoxic oxovanadium(IV) complexes of ferrocenyl-terpyridine and acetylacetonate derivatives.

Abstract:

:Oxovanadium(IV) complexes [VO(Fc-tpy)(acac)](ClO4) (1), [VO(Fc-tpy)(nap-acac)](ClO4) (2), [VO(Fc-tpy)(py-acac)](ClO4) (3) and [VO(Ph-tpy)(py-acac)](ClO4) (4) of 4'-ferrocenyl-2,2':6',2"-terpyridine (Fc-tpy) and 4'-phenyl-2,2':6',2"-terpyridine (Ph-tpy) having monoanionic acetylacetonate (acac), naphthylacetylacetonate (nap-acac) or pyrenylacetylacetonate (py-acac) ligand were prepared, characterized and their photocytotoxicity in visible light studied. The ferrocenyl complexes 1-3 showed an intense charge transfer band near 585 nm in DMF and displayed Fc(+)/Fc and V(IV)/V(III) redox couples near 0.66 V and -0.95 V vs. SCE in DMF-0.1 M TBAP. The complexes as avid binders to calf thymus DNA showed significant photocleavage of plasmid DNA in green light (568 nm) forming OH radicals. The complexes that are photocytotoxic in HeLa and MCF-7 cancer cells in visible light (400-700 nm) with low dark toxicity remain nontoxic in normal fibroblast 3T3 cells. ICP-MS and fluorescence microscopic studies show significant cellular uptake of the complexes. Photo-irradiation of the complexes causes apoptotic cell death by ROS as evidenced from the DCFDA assay.

journal_name

Eur J Med Chem

authors

Balaji B,Balakrishnan B,Perumalla S,Karande AA,Chakravarty AR

doi

10.1016/j.ejmech.2015.01.003

subject

Has Abstract

pub_date

2015-03-06 00:00:00

pages

332-41

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(15)00014-8

journal_volume

92

pub_type

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