Ruthenium(II) bipyridine complexes bearing quinoline–azoimine (NN0N00) tridentate ligands: Synthesis, spectral characterization, electrochemical properties and single-crystal X-ray structure analysis

Journal Title, Volume, Page:

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 125 (2014) 375–383

Year of Publication:

2014

Link:

http://www.sciencedirect.com/science/article/pii/S1386142514000961

Preferred Abstract (Original):

Four octahedral ruthenium(II) azoimine–quinoline complexes having the general molecular formula

[RuII(LAY)(bpy)Cl](PF6) {LAY = YC6H4N@NC(COCH3)@NC9H6N, Y = H (1), CH3 (2), Br (3), NO2 (4) and

bpy = 2,20-bipyrdine} were synthesized. The azoimine–quinoline based ligands behave as NN0N00 tridentate

donors and coordinated to ruthenium via azo-N0 , imine-N0 and quinolone-N00 nitrogen atoms. The

composition of the complexes has been established by elemental analysis, spectral methods (FT-IR, electronic,

1H NMR, UV/Vis and electrochemical (cyclic voltammetry) techniques. The crystal structure of complex 1 is reported. The Ru(II) oxidation state is greatly stabilized by the novel tridentate ligands,

showing Ru(III/II) couples ranging from 0.93–1.27 V vs. Cp2Fe/Cp2Fe+. The absorption spectrum of 1 in

dichloromethane was modeled by time-dependent density functional theory (TD-DFT).

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Ruthenium(II) bipyridine complexes bearing quinoline–azoimine (NN0N00) tridentate ligands: Synthesis, spectral characterization, electrochemical properties and single-crystal X-ray structure analysis