Ru(II) polypyridine complexes which can undergo photo-induced ligand dissociation and subsequent DNA covalent binding may potentially serve as photoactivated chemotherapeutic (PACT) agents. In this paper, three fluorinated dppz ligand coordinated Ru(II) complexes (2–4) containing four monodentate pyridine ligands were studied. All complexes released one pyridine and covalently bound to DNA upon 470
Substituted dipyridophenazine complexes of Cr(iii): Synthesis, enantiomeric resolution and binding interactions with calf thymus DNA
作者:Suni Vasudevan、Jayden A. Smith、Michal Wojdyla、Thomas McCabe、Nicholas C. Fletcher、Susan J. Quinn、John M. Kelly
DOI:10.1039/c000150c
日期:——
[Cr(phen)2(X2dppz)]3+ X = H, Me, or F} have been synthesised, characterised, and chromatographically resolved into their constituent Δ and Λ enantiomers. The DNA-binding interactions of each of the racemic complexes were investigated, with the results of linear dichroism, thermal denaturation, and emission quenching studies indicative of intercalative binding to CT-DNA with a significant electrostatic contribution. UV/Vis absorption titrations suggest strong DNA binding by each of the racemic complexes, with the methylated analogue [Cr(phen)2(Me2dppz)]3+ exhibiting the largest equilibrium binding constant. Emission quenching and UV-Vis titrations of the enantiomers of [Cr(phen)2(dppz)]3+ imply similar binding affinities for the Δ and Λ isomers, although significant differences between the circular dichroism spectra of the enantiomers in the presence of DNA connote differences in binding orientation and/or conformation between the two.
作者:Víctor García-López、Jovana V. Milić、Michal Zalibera、Dmytro Neshchadin、Martin Kuss-Petermann、Laurent Ruhlmann、Julia Nomrowski、Nils Trapp、Corinne Boudon、Georg Gescheidt、Oliver S. Wenger、François Diederich
DOI:10.1016/j.tet.2018.08.002
日期:2018.9
A light-actuated resorcin[4]arene cavitand equipped with two quinone (Q) and two opposite Ru(II)-based photosensitizing walls was synthesized and investigated. The cavitand is capable of switching from an open to a contracted conformation upon reduction of the two Q to the corresponding SQ radical anions by intramolecular photoinduced electron transfer in the presence of a sacrificial donor. The molecular
Increased Lipophilicity of Halogenated Ruthenium(II) Polypyridyl Complexes Leads to Decreased Phototoxicity in vitro when Used as Photosensitizers for Photodynamic Therapy
One up, one down: RuII polypyridylcomplexes are prime candidates for the development of new photosensitizers for photodynamictherapy. Increasing their lipophilicity could result in improved pharmacological properties. The relationship between lipophilicity and in vitrophototoxicity of halogenated RuII complexes was investigated.