A novel ruthenium(II) complex, [dibipyridyl-(5-pyridine-10,15,20-tri-phenylporphyrin)] ruthenium(II) chloride, (1), has been synthesized and characterized by elementary analyzing, ESI-MS and 13 C-NMR, as well as spectroscopy. The electronic spectra and emission spectra have been utilized to study the interaction of this ruthenium(II) complex (1) with the total RNA of liver cells, and the results show that there was obviously hypochromism and a red shift was observed for the Soret absorption and IL transition in electronic spectra of ruthenium(II) complex (1) in the presence of total RNA of liver cells, and the hypochromism of Soret absorption and IL absorption of complex (1) is 25% and 10%, respectively. The studies on the steady-state emission spectra of complex (1) show that the fluorescent of (1) in the 550-700 nm range increased obviously in the presence of total RNA of liver cells. These data, together with that of electronic spectra, shown that the ruthenium(II) complex (1) can bind to RNA excellently.

A novel ruthenium(II) porphyrin complex, [Ru(phen) 2 MPyTPP] (phen = phenanthroline, MPyTPP = mono-(3 0 -Pyridine)-10,15,20-triphenyl porphyrin), has been prepared and characterized by elemental analysis, ESI-MS and NMR methods. The interaction of the complex with G-quadruplex DNA has been studied by spectroscopy, and the results have shown that [Ru(phen) 2 MPyTPP] can bind to G-quadruplex d(TTAGGG) 4 with high affinity. In the presence of d(TTAGGG) 4 , the characteristic Soret and intra-ligand (IL) transitions in the UV-Vis spectrum of the complex exhibit hypochromism of 25% (Dk = 6 nm) and 18% (Dk = 1 nm), respectively. The intrinsic binding constant was calculated according to the decay of the Soret band as 3.02(±0.08) 9 10 6 M -1 . The positive signal of d(TTAGGG) 4 in its circular dichroism spectra was clearly decreased in the presence of the complex, indicating the conformation of the G-quadruplex was severely disturbed by the ruthenium(II) complex.

Two new Ruthenium (II) polypyridyl complexes [Ru(dmp) 2 (ipbp)](ClO 4 ) 2 (1) (dmp = 2,9-dimethyl-1,10-phenanthroline, ipbp = 3-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-4H-1-banzopyran-2-one) and [Ru(dmb) 2 (ipbp)](ClO 4 ) 2 (2) (dmb = 4,4 0 -dimethyl-2,2 0 -bipyridine) have been synthesized and characterized by elemental analysis, FAB-MS, ES-MS and 1 H NMR and cyclic voltammetric methods. The DNA-binding behaviors of these complexes were investigated by spectroscopic titration, viscosity measurements, and thermal denaturation. Absorption titration and thermal denaturation studies reveal that these complexes are moderately strong binders of calf thymus DNA (CT-DNA). Viscosity measurements show that the complexes 1 and 2 interact with CT-DNA by intercalative mode. The DNA-binding affinity of the complex 2 is larger than that of complex 1.

Two blue emitting dual core materials 1 and 2 consisting of phenanthroimidazole and anthracene or pyrene chromophores were synthesized, and efficient nondoped blue-emitting OLEDs with low onset voltages and little efficiency roll-off were fabricated.

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