Simple poly(pyridine)ruthenium (II) photosensitizer: (2,2'-bipyridine)tetracyanoruthenate(II)

Journal Article · Wed Nov 26 04:00:00 EST 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00284a084· OSTI ID:7031797

Bignozzi, C A; Chiorboli, C; Indelli, M T; Scandola, M A.R.; Varani, G; Scandola, F

The outstanding properties of the tris(2,2'-bipyridine)ruthenium(II), Ru(bpy)/sub 3//sup 2 +/, photosensitizer come from the presence of a long-lived, strongly reducing d-..pi..* metal-to-ligand charge-transfer triplet excited state. In recent years, compelling evidence has been accumulating for the fact that in the d-/sup 0/* state of Ru(bpy)/sub 3//sup 2 +/ the excited electron is localized on a single bpy ligand. In principle, therefore, complexes containing a single Ru-bpy unit and four ancillary ligands could exhibit most of the interesting properties of the parent Ru(bpy)/sub 3//sup 2 +/. In practice, very little photophysical information is available on mono-bpy complexes of the Ru(bpy)X/sub 4/ type (except for the cases in which the X/sub 4/ set is made by other polypyridine-type ligands). Aside from specific synthesis problems, this may be due to the fact that, unless very strong-field ancillary ligands are used, ligand field states provide a low-energy pathway for efficient radiationless decay of the useful d-..pi..* excited state. In this paper, they report on the synthesis and basic photophysical properties of (2,2'-bipyridine)tetracyanourethenate(II), Ru(bpy)(CN)/sub 4//sup 2 -/. Owing to its simplicity (minimal chromophoric unit, truly nonchromophoric ancillary ligands, full C/sub 2 upsilon/ symmetry), this complex may be considered as a prototype for the class of Ru(II) polypyridine photosensitizers.

• Research Organization: Universita Centro di Fotochimica C.N.R., Ferrara, Italy
• OSTI ID: 7031797
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 108:24; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
AZINES
BIPYRIDINES
CHEMICAL PREPARATION
CHEMISTRY
COMPLEXES
DATA
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
LIGANDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMISTRY
PHOTOSENSITIVITY
PYRIDINES
RUTHENIUM COMPLEXES
SENSITIVITY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES