title: Spectroscopic studies on the binding of holmium-1,10-phenanthroline complex with DNA.
abstract: Fluorescence and absorption spectroscopy, circular dichroism (CD) as well as viscosity experiment have been used to characterize the DNA binding of [Ho(Phen)(2)Cl(3)]·H(2)O, where phen stand for 1,10-phanathroline. This complex exhibits the marked decrease in the emission intensity and some hypochromism in UV-Vis spectrum in the presence of DNA. For characterization of the binding mode between the Ho(III) complex and DNA various procedures such as: absorption and emission titration and EB quenching experiments, viscosity measurements, CD study, iodide quenching assay, salt effect and thermodynamical investigation are used. The intrinsic binding constant of [Ho(Phen)(2)Cl(3)]·H(2)O with DNA is calculated by UV-Vis and florescence spectroscopy. The value of binding constants in 296, 299 and 303 are 1.99 ± 0.07 × 10(4), 1.07 ± 0.09 × 10(4) and 0.84 ± 0.06 × 10(4), respectively. The thermodynamic studies show that the reaction is entropically driven. The above-mentioned physical measurements indicate that the Ho(III) complex binds to fish salmon DNA, presumably via groove binding mode.
authors.affiliation: Department of Chemistry, University of Sistan & Baluchestan, P.O. Box 98155-147, Zahedan, Iran.
authors.forename: Sona
authors.initials: S
authors.lastname: Niroomand
authors.forename: Mozhgan
authors.initials: M
authors.lastname: Khorasani-Motlagh
authors.forename: Meissam
authors.initials: M
authors.lastname: Noroozifar
authors.forename: Asieh
authors.initials: A
authors.lastname: Moodi
mesh_terms: D000042:Absorption; D002942:Circular Dichroism; D056831:Coordination Complexes / Q000378:metabolism*; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D007454:Iodides / Q000737:chemistry; D009994:Osmolar Concentration; D010618:Phenanthrolines / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013816:Thermodynamics; D014783:Viscosity
chemical_list: D056831:Coordination Complexes; D007454:Iodides; D010618:Phenanthrolines; D004247:DNA