Dipyrido 3,2-a:2 ,3 -c -phenazine

The DNA binding of [cp Ir(dppz)(Aa)]"+, dppz = dipyrido[3,2-a 2, 3 -c]phenazine, Aa = S-coor-dinated amino acid or peptide, has been investigated by UV-vis spectroscopy, 2D-NOESY, and gel electrophoresis. The complexes intercalate into DNA adjacent to T2 from the major groove. The X-ray structural data for [cp IrCl(dppz)](CF3S03)4 and [ cp Ir(9-EtG)(Phen)](CF3S03)2, where GH = guanine, are reported.423... 

Electronic spectroscopic and electrochemical data for [Ru(bpy)2(98)] " ((98) = dipyrido [3,2-a 2, 3 -c]phenazine) are consistent with the presence of two electronically separate units, one behaving like [Ru(bpy)3] + and the other resembling a phenazine-like acceptor. " Spectroscopic... 

Figure 11.14 A ruthenium (II) complex of an annulated donor-acceptor (DA) ensemble, 4, 5 -bis (propylthio)tetrathiafulvenyl[i]dipyrido-[3,2-a 2, 3 -c]phenazine (TTF-dppz) exhibiting a long-lived charge-separated state TTF-dppz -Ru2+-dppz-TTF+ on photoexcitation.9...

TRRR measurements for [Re(dppz-X)(C0)3Cl], where dppz is dipyrido[3, 2-a 2/,3/-c]phenazine and X = Br and COOC2H5 were examined for dppz-X vibrations. The results were in agreement with a 3MLCT excited state assignment [71]. 

DFT DMT dppn dppz dppz-biotin Density functional theory Dimethoxytrityl BenzolT ldipyridolA -a. S -cJphenazine Dipyrido[3,2-a 2, 3 -c]phenazine ll-[(2-Biotinamido)ethyl]amidodipyrido[3,2-a 2, 3,-c] phenazine... 

Ad = adamantyl Ar = aryl [BarF] = [B 3,5-(CF3)2C6 H3 4] bipy = 2,2 -dipyridyl COD = 1,5-cyclooctadiene CVD = chemical vapor deposition DAB =1,4 diazabuta-diene DBU = l,8-Diazabicyclo[5.4.0]undec-7-ene DIPP = 2,6-j-Pr2C6H3 DMF = dimethylformamide DMSO = dimethylsulphoxide,OSMe2 dppe = 1,2-diphenylphosphino-ethane dppf = l,l -bis(diphenylphosphino)ferrocene dppm = diphenylphos-phinomethane dppz = dipyrido[3,2-a 2, 3 -c]phenazine FTIR = Fourier transform infrared spectroscopy HBpin = pinacolborane, 4,4,5,5-tetramethyl-l,3,2-dioxaborolane HDS = hydrodesulfurization HMPA =... 

Bipyridine reacts with [(q5-Cp )Ru(NO)(OTf)2] in THF to yield the dicationic complex 12 (96IC4383). The same ruthenium precursor with dipyrido[3,2-a 2, 3 -c] phenazine produces 13. [(q5-Cp)Ru(q2-dimethyl maleate)(bpy)] is also described (92OM456). 

An intriguing example reported by Meyer and co-workers has revealed that the observed MLCT emission in a system with close-lying MLCT and IL states does not necessarily prove that the lowest excited state is MLCT in character. In the case of ClRe(CO)3(dppz) (dppz is dipyrido[3,2-a 2, 3 -c]phenazine), the lowest excited state was determined to be the TT-TT excited state by time-resolved resonance Raman spectroscopy, although the emission apparently originates from the MLCT excited state. Replacing Cl by PPhs yields emission originating from the state, which is also confirmed by time-resolved resonance Raman... 

Frodl et al. [95] have incorporated the DNA intercalator dppz (dipyrido[3,2-a 2, 3 -c]phenazine) as a chelated diamine into [(ri -arene)Ru(Aa)(dppz)] (Aa = L-cysteine or i-methionine) complexes (e.g. 26, Fig. 2.17). Stable intercalative binding was observed with stability constants which increased from ca. 10 to ca. 10 as the charge on the complexes increased from +1 to +3. 

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