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• W2110144497 abstract "Oxovanadium(IV) complexes [VO(L)(B)](ClO4) (1–3) of N-2-pyridylmethylidine-2-hydroxyphenylamine (HL) Schiff base and phenanthroline bases (B), viz. 1,10-phenanthroline (phen in 1), dipyrido[3,2-d:2′,3′-f]quinoxaline (dpq in 2) or dipyrido[3,2-a:2′,3′-c]phenazine (dppz in 3), were prepared, characterized and their DNA binding property, photo-induced DNA cleavage activity and photocytotoxicity in HeLa cells studied. The crystal structure of 1 shows the presence of a VO2+ moiety in VO2N4 coordination geometry. The complexes show a d–d band at ∼830 nm in DMF. The complexes display an oxidative V(V)–V(IV) response near 0.5 V versus SCE and a reductive V(IV)/V(III) response near −0.65 V in DMF −0.1 M TBAP. The complexes that are avid binders to CT DNA giving Kb values within 7.1 × 104 to 3.2 × 105 M−1, do not show any significant chemical nuclease activity in presence of 3-mercaptopropionic acid or glutathione. The dpq and dppz complexes are photocleavers of pUC19 DNA in UV-A light of 365 nm forming both 1O2 and ·OH radicals and in near-IR light of 785 nm forming ·OH radicals. The dppz complex exhibits photocytotoxicity in visible light in HeLa cells (IC50 = 6.8 μM). Flow-cytometric study on this complex shows a high sub-G1 phase in light compared to dark indicating PDT effect." @default.
• W2110144497 created "2016-06-24" @default.
• W2110144497 creator A5010638335 @default.
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• W2110144497 date "2011-06-01" @default.
• W2110144497 modified "2023-10-11" @default.
• W2110144497 title "Schiff base oxovanadium(IV) complexes of phenanthroline bases showing DNA photocleavage activity at near-IR light and photocytotoxicity" @default.
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• W2110144497 doi "https://doi.org/10.1016/j.ica.2011.01.086" @default.
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