TY - JOUR
T1 - Variation of DNA photocleavage efficiency for [(TL)2Ru(dpp)]Cl2 complexes where TL = 2,2′-bipyridine, 1,10-phenanthroline, or 4,7-diphenyl-1,10-phenanthroline
AU - Mongelli, Matthew T.
AU - Heinecke, Julie
AU - Mayfield, Shatara
AU - Okyere, Benjamin
AU - Winkel, Brenda S.J.
AU - Brewer, Karen J.
PY - 2006/12
Y1 - 2006/12
N2 - The complexes [(bpy)2Ru(dpp)]Cl2, [(phen)2Ru(dpp)]Cl2, and [(Ph2phen)2Ru(dpp)]Cl2 (where dpp = 2,3-bis(2-pyridyl)pyrazine, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, Ph2phen = 4,7-diphenyl-1,10-phenanthroline) have been investigated and found to photocleave DNA via an oxygen-mediated pathway. These light absorbing complexes possess intense metal-to-ligand charge transfer (MLCT) transitions in the visible region of the spectrum. The [(TL)2Ru(dpp)]2+ systems populate 3MLCT states after visible light excitation, giving rise to emissions in aqueous solution centered at 692, 690, and 698 nm for TL = bpy, phen, and Ph2phen respectively. The 3MLCT states and emissions are quenched by O2, producing a reactive oxygen species. These complexes photocleave DNA with varying efficiencies, [(Ph2phen)2Ru(dpp)]2+ > [(phen)2Ru(dpp)]2+ > [(bpy)2Ru(dpp)]2+. The presence of the polyazine bridging ligand will allow these chromophores to be incorporated into larger supramolecular assemblies.
AB - The complexes [(bpy)2Ru(dpp)]Cl2, [(phen)2Ru(dpp)]Cl2, and [(Ph2phen)2Ru(dpp)]Cl2 (where dpp = 2,3-bis(2-pyridyl)pyrazine, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, Ph2phen = 4,7-diphenyl-1,10-phenanthroline) have been investigated and found to photocleave DNA via an oxygen-mediated pathway. These light absorbing complexes possess intense metal-to-ligand charge transfer (MLCT) transitions in the visible region of the spectrum. The [(TL)2Ru(dpp)]2+ systems populate 3MLCT states after visible light excitation, giving rise to emissions in aqueous solution centered at 692, 690, and 698 nm for TL = bpy, phen, and Ph2phen respectively. The 3MLCT states and emissions are quenched by O2, producing a reactive oxygen species. These complexes photocleave DNA with varying efficiencies, [(Ph2phen)2Ru(dpp)]2+ > [(phen)2Ru(dpp)]2+ > [(bpy)2Ru(dpp)]2+. The presence of the polyazine bridging ligand will allow these chromophores to be incorporated into larger supramolecular assemblies.
KW - DNA interactions
KW - Emission spectroscopy
KW - Photocleavage
KW - Polyazine bridging ligand
KW - Ruthenium complexes
UR - http://www.scopus.com/inward/record.url?scp=33750955415&partnerID=8YFLogxK
U2 - 10.1016/j.jinorgbio.2006.09.010
DO - 10.1016/j.jinorgbio.2006.09.010
M3 - Article
C2 - 17095094
AN - SCOPUS:33750955415
SN - 0162-0134
VL - 100
SP - 1983
EP - 1987
JO - Journal of Inorganic Biochemistry
JF - Journal of Inorganic Biochemistry
IS - 12
ER -