Preparation, spectroscopy, and photochemistry of monometallic and bimetallic ruthenium(II) ammine complexes of 2,2'-bipyrimidine

Journal Article · Fri Oct 01 00:00:00 EDT 1982 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00140a021· OSTI ID:6203542

Ruminski, R R; Petersen, J D

The monometallic and bimetallic complexes of ruthenium(II) ammines bound to 2,2'-bipyrimidine, (NH/sub 3/)/sub 4/Ru(bpym)/sup 2 +/ and ((NH/sub 3/)/sub 4/Ru)/sub 2/(bpym)/sup 4 +/, have been prepared and characterized. Electronic spectroscopy of the monometallic complex shows an intense metal-to-ligand charge-transfer (MLCT) band in the visible region centered at 402 nm while the bimetallic complex has intense absorption bands (MLCT in nature) at 424 and 697 nm. Cyclic voltammetry of the monometallic complex in aqueous solution shows a reversible one-electron oxidation with E/sup 0/ = +0.756 V vs. NHE. The bimetallic complex shows a reversible one-electron oxidation with E/sup 0/' = +0.830 V. A second one-electron oxidation of the bimetallic complex is quasireversible (E/sup 0/' approx. = +1.02 V) and results in the breakdown of the fully oxidized species to (NH/sub 3/)/sub 4/Ru(bpym)/sup 3 +/ and (NH/sub 3/)/sub 4/Ru(H/sub 2/O)/sub 2//sup 3 +/. Photolysis of the bimetallic complex at 436 or 691 nm leads to only slight degradation of the complex with an upper limit phi < 5 x 10/sup -4/ mol/einstein.

• Research Organization: Clemson Univ., SC
• DOE Contract Number: AS09-80ER10671
• OSTI ID: 6203542
• Journal Information: Inorg. Chem.; (United States), Vol. 21:10
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RUTHENIUM COMPLEXES
CHEMICAL PREPARATION
PHOTOCHEMISTRY
ABSORPTION SPECTRA
AMMINES
BIPYRIDINES
VOLTAMETRY
AZINES
CHEMISTRY
COMPLEXES
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SPECTRA
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400500* - Photochemistry
400301 - Organic Chemistry- Chemical &amp; Physicochemical Properties- (-1987)