2,2[prime]:4,4[double prime]:4[prime],4[prime][double prime]-quaterpyridyl: A building block for the preparation of novel redox reagents. 2. Bis(2,2[prime]-bipyridine)ruthenium(II) complexes

Journal Article · Wed Dec 25 04:00:00 EST 1991 · Inorganic Chemistry; (United States)

DOI:https://doi.org/10.1021/ic00026a010· OSTI ID:6769558

Bierig, K; Morgan, R J; Tysoe, S; Gafney, H D; Strekas, T C; Baker, A D ^[1]

---

1. City Univ. of New York, Flushing (United States)

The syntheses and properties of three new ruthenium(II) complexes based on the ligand 2,2[prime]:4,4[double prime]:4[prime],4[prime][double prime]-quaterpyridyl (qpy) are reported. Each new complex is of the type [Ru(bpy)[sub 2]L][sup n+], where L is the parent qpy ligand or is qpy derivatized by the methylation of one or both of the non-[alpha]-diimine nitrogen atoms and n = 2, 3, or 4. The photophysical and electrochemical properties of the new complex ions are reported. The parent ion [Ru(bpy)[sub 2]qpy][sup 2+] is strongly luminescent and has a relatively long lifetime, e.g. in excess of 1400 ns in acetonitrile solution. In contrast, the lifetime of the dimethyl derivative [Ru(bpy)[sub 2](qpyme[sub 2])][sup 4+] is less than 100 ns. This dimethylated complex has some novel properties. The excited state produced by M-L excitation to the qpyme[sub 2][sup 2+] ligand can be considered in terms of a Ru(III) core and a positively charged ligand. Typically, the excited states of other ruthenium(II) diimine complexes have had neutral or negatively charged ligands. Further, in structural terms, the complex can be considered as an intramolecular assembly of a ruthenium(II) diimine site and a viologen site. Cyclic voltammetry indicates that the first two electrons added to the complex enter the viologen-like acceptor site constituted by the qpyme[sub 2][sup 2+] ligand.

• OSTI ID: 6769558
• Journal Information: Inorganic Chemistry; (United States), Journal Name: Inorganic Chemistry; (United States) Vol. 30:26; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400* -- Electrochemistry
400500 -- Photochemistry
AZINES
BIPYRIDINES
CHEMICAL PREPARATION
COMPLEXES
DATA
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
LIFETIME
LUMINESCENCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
RUTHENIUM COMPLEXES
SPECTROSCOPY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VOLTAMETRY