title: A new family of ruthenium(II) polypyridine complexes bearing 5-aryltetrazolate ligands as systems for electrochemiluminescent devices.
abstract: A new family of mono- and dinuclear ruthenium polypyridyl complexes containing 5-aryltetrazolate ligands such as the deprotonated form of 4-(1H-tetrazol-5-yl)benzonitrile (4-TBNH) and bis(1H-tetrazol-5-yl)benzene (BTBH(2)) have been synthesized and thoroughly characterized. The reactivity of the mononuclear species toward different electrophiles such as H(+) and CH(3)(+) has been investigated, and the effects of the resulting regioselective electrophilic attacks on the electronic and structural properties of the tetrazolate ligand have been studied by NMR ((1)H, (13)C) spectroscopy and X-ray crystal structures. Absorption and emission spectroscopy, together with an electrochemical and UV-vis-NIR spectroelectrochemical investigation of the uncoordinated ligand and complexes, has been performed, highlighting a rather good luminescence efficiency and a poor bridge-mediated electronic communication between the metal centers of the dinuclear complexes. The electrogenerated chemiluminescence (ECL) of the dinuclear species has been explored, and for one of these, an exceptionally high ECL efficiency has been observed, comparable to that of [Ru(bpy)(3)](2+), which is considered a standard in ECL studies.
authors.affiliation: Dipartimento di Chimica Fisica ed Inorganica, Università di Bologna, viale Risorgimento 4, I-40136 Bologna, Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Stagni
authors.forename: Antonio
authors.initials: A
authors.lastname: Palazzi
authors.forename: Stefano
authors.initials: S
authors.lastname: Zacchini
authors.forename: Barbara
authors.initials: B
authors.lastname: Ballarin
authors.forename: Carlo
authors.initials: C
authors.lastname: Bruno
authors.forename: Massimo
authors.initials: M
authors.lastname: Marcaccio
authors.forename: Francesco
authors.initials: F
authors.lastname: Paolucci
authors.forename: Magda
authors.initials: M
authors.lastname: Monari
authors.forename: Maurizio
authors.initials: M
authors.lastname: Carano
authors.forename: Allen J
authors.initials: AJ
authors.lastname: Bard
mesh_terms: D018360:Crystallography, X-Ray; D004563:Electrochemistry; D008024:Ligands; D049449:Luminescence; D008163:Luminescent Measurements; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D013777:Tetrazoles / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; D013777:Tetrazoles; D012428:Ruthenium