# Resonance Raman spectroscopic studies of $[Ru(phen)_{2}qdppz]^{2+}$ and its interactions with calf thymus DNA

Abraham, B and Sastri, C and Maiya, B and Umapathy, S (2004) Resonance Raman spectroscopic studies of $[Ru(phen)_{2}qdppz]^{2+}$ and its interactions with calf thymus DNA. In: Journal of Raman Spectroscopy, 35 (1). pp. 13-18.

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## Abstract

Resonance Raman (RR) spectroscopy was employed to study the metal to ligand charge transfer (MLCT) and intraligand transition (IL) state of the $[Ru(phen)_{2}qdppz]^{2+}$ complex, where phen = 1, 10-phenanthroline and qdppz = naphtho[2,3-a]dipyrido[3,2-h:2',3'-f]phenazine-5,18-dione. The vibrational bands were assigned based on the data available for $[Ru(phen)_{2}qdppz]^{2+}$ (dppz = dipyrido[3,2-a:2',3'-c]phenazine), $[Ru(dppz)_3]^{2+}$ and $[Ru(phen)_3]^{2+}$. The tail end of the MLCT band is inferred to be the Ru \longrightarrow qdppz localized transition based on vibrational intensity analysis. On intercalation with DNA, the modes assigned to qdppz decrease in intensity owing to \pi\pi stacking interactions with the DNA bases. RR data show that the above complex binds to DNA through intercalation via the qdppz moiety.

Item Type: Journal Article Journal of Raman Spectroscopy John Wiley and Sons Copyright of this article belongs to John Wiley and Sons. Resonance Raman;calf thymus dna;intercalation Division of Chemical Sciences > Inorganic & Physical Chemistry 01 Mar 2006 22 Feb 2012 09:09 http://eprints.iisc.ac.in/id/eprint/5587