Spectroelectrochemical properties of ruthenium(II) tris chelate complexes 2,2'-bipyrimidine and 2,2'-bipyrazine
Journal Article
·
· Inorg. Chem.; (United States)
The electronic absorption and resonance Raman (RR) spectra of the reduction products of (Ru(bpm)/sub 3/)/sup 2-n/ and mixed-ligand complexes (Ru(bpz)/sub x/(bpy)/sub 3-x/)/sup 2-n/ (x = 1-3, n = 0-3) are discussed, as well as the low-temperature electron spin resonance (ESR) spectrum of (Ru(bpz)/sub 3/)/sup 0/ (bpm = 2.2'-bipyrimidine, bpz = 2,2'-bipyrazine, and bpy = 2,2'-bipyridine). The ultraviolet (UV) absorption and RR spectra for the reduction products of the tris(bipyrimidine) complex are analogous to those of the tris(bipyridine) complex and argue strongly for a localized redox orbital description. While the ESR and near-IR (near infrared) absorption spectra also argue for localized redox orbitals in the bpz complexes, the simple (bpz)/sub 3-n//(bpz/sup -/)/sub n/ ..pi.. ..-->.. ..pi..* chromophoric behavior typical in the UV absorption spectrum is not observed. Furthermore, there is a gradual shifting of the RR peaks as electrons are added, with no distinct vibrational pattern from reduced and unreduced bipyrazine ligands for the one- and two-electron-reduction products as seen in the complexes of (Ru(bpy)/sub 3/)/sup 2-n/ and (Ru(bpm)/sub 3/)/sup 2-n/.
- Research Organization:
- North Carolina State Univ., Raleigh
- OSTI ID:
- 5522182
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 26:17; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
ABSORPTION SPECTROSCOPY
AZINES
BIPYRIDINES
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
ELECTROCHEMISTRY
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
INFRARED SPECTRA
LASER SPECTROSCOPY
LIGANDS
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
RAMAN SPECTROSCOPY
REDUCTION
RESONANCE
RUTHENIUM COMPLEXES
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
ULTRAVIOLET SPECTRA
400400* -- Electrochemistry
ABSORPTION SPECTROSCOPY
AZINES
BIPYRIDINES
CHEMICAL REACTIONS
CHEMISTRY
COMPLEXES
DATA
ELECTROCHEMISTRY
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
INFRARED SPECTRA
LASER SPECTROSCOPY
LIGANDS
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
RAMAN SPECTROSCOPY
REDUCTION
RESONANCE
RUTHENIUM COMPLEXES
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPLEXES
ULTRAVIOLET SPECTRA