Photoinduced Electron Transfer between Anionic Corrole and DNA

Li-Li Wang; Lei Zhang; Hui Wang; Yang Zhang; Jun-Teng Huang; He Zhu; Xiao Ying; Liang-Nian Ji; Hai-Yang Liu

doi:10.1021/acs.jpca.5b11021

Photoinduced Electron Transfer between Anionic Corrole and DNA

J Phys Chem A. 2016 Feb 4;120(4):535-42. doi: 10.1021/acs.jpca.5b11021. Epub 2016 Jan 20.

Authors

Li-Li Wang^{1

2}, Lei Zhang^{1

2}, Hui Wang^{1

2}, Yang Zhang^{1

2}, Jun-Teng Huang^{1

2}, He Zhu^{1

2}, Xiao Ying^{1

2}, Liang-Nian Ji^{1

2}, Hai-Yang Liu^{1

2}

Affiliations

¹ State Key Laboratory of Optoelectronics Materials and Technologies and ‡School of Chemistry and Chemical Engineering/MOE Laboratory of Bioinorganic and Synthetic Chemistry, Sun Yat-sen University , Guangzhou 510275, China.
² Department of Chemistry and ∥Department of Applied Physics, South China University of Technology , Guangzhou 510641, China.

PMID: 26752116
DOI: 10.1021/acs.jpca.5b11021

Abstract

The interaction between a water-soluble anionic Ga(III) corrole [Ga(tpfc)(SO3Na)2] and calf thymus DNA (ct-DNA) has been investigated by using femtosecond transient absorption spectroscopy. A significant broadening from 570 to 585 nm of positive absorption band of the blend of Ga(tpfc)(SO3Na)2 and ct-DNA (Ga(tpfc)(SO3Na)2-ctDNA) has been observed from 0.15 to 0.50 ps after photoexcitation of Ga(tpfc)(SO3Na)2 into the Soret band. The control experiment has been performed on the model DNA ([poly(dG-dC)]2) rich in guanine bases, which exhibits a similar spectral broadening, whereas it is absent for [poly(dA-dT)]2 without guanine bases. The molecular orbital calculation shows that HOMO of Ga(tpfc)(SO3Na)2 is lower than that of guanine bases. The results of the electrochemical experiment show the reversible electron transfer (ET) between Ga(tpfc)(SO3Na)2 and guanine bases of ct-DNA is thermodynamically favorable. The dynamical analysis of the transient absorption spectra reveals that an ultrafast forward ET from the guanine bases to Ga(tpfc)(SO3Na)2 occurs within the pulse duration (156 fs), leading to the formation of an intermediate state. The following back ET to the ground state of Ga(tpfc)(SO3Na)2 may be accomplished in 520 fs.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Animals
Anions / chemistry
Cattle
DNA / chemistry*
Electron Transport
Gallium / chemistry
Molecular Structure
Organometallic Compounds / chemistry*
Photochemical Processes
Porphyrins / chemistry*
Quantum Theory

Substances

Anions
Organometallic Compounds
Porphyrins
corrole
DNA
calf thymus DNA
Gallium