title: Ruthenium(II) bipyridine complexes bearing quinoline-azoimine (NN'N″) tridentate ligands: synthesis, spectral characterization, electrochemical properties and single-crystal X-ray structure analysis.
abstract: Four octahedral ruthenium(II) azoimine-quinoline complexes having the general molecular formula [Ru(II)(L-Y)(bpy)Cl](PF6) {L-Y=YC6H4N=NC(COCH3)=NC9H6N, Y=H (1), CH3 (2), Br (3), NO2 (4) and bpy=2,2'-bipyrdine} were synthesized. The azoimine-quinoline based ligands behave as NN'N″ tridentate donors and coordinated to ruthenium via azo-N', imine-N' and quinolone-N″ nitrogen atoms. The composition of the complexes has been established by elemental analysis, spectral methods (FT-IR, electronic, (1)H 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).
authors.affiliation: Department of Chemistry, Hashemite University, P.O. Box 150459, Zarqa 13115, Jordan. Electronic address: manoaimi@hu.edu.jo.
authors.forename: Mousa
authors.initials: M
authors.lastname: Al-Noaimi
authors.affiliation: Fachbereich Chemie der Universität Konstanz, Universitätstraße 10, D-78457 Konstanz, Germany.
authors.forename: Obadah S
authors.initials: OS
authors.lastname: Abdel-Rahman
authors.affiliation: Department of Chemistry, Hashemite University, P.O. Box 150459, Zarqa 13115, Jordan.
authors.forename: Ismail I
authors.initials: II
authors.lastname: Fasfous
authors.affiliation: Chemistry Department, Faculty of Science and Arts, Jordan University of Science and Technology, Irbid 22110, Jordan.
authors.forename: Mohammad
authors.initials: M
authors.lastname: El-khateeb
authors.affiliation: Department of Chemistry, The University of Jordan, Amman 11942, Jordan.
authors.forename: Firas F
authors.initials: FF
authors.lastname: Awwadi
authors.affiliation: Department of Chemistry, AN-Najah National University, Nablus, Occupied Palestinian Territory.
authors.forename: Ismail
authors.initials: I
authors.lastname: Warad
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D055664:Electrochemical Techniques; D004563:Electrochemistry; D004583:Electrons; D007097:Imines / Q000737:chemistry*; D008024:Ligands; D008752:Methylene Chloride / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D011789:Quantum Theory; D011804:Quinolines / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
chemical_list: D007097:Imines; D008024:Ligands; D009942:Organometallic Compounds; D011804:Quinolines; C103599:bis(bipyridyl)ruthenium(II); D015082:2,2'-Dipyridyl; D008752:Methylene Chloride; C037219:quinoline
keywords: Azoimine–quinoline ligands; DFT calculation; Electrochemistry; Ruthenium; Spectroelectrochemistry