Intramolecular energy transfer reactions as a method for metal complex assisted production of hydrogen. Progress report, July 1, 1985-June 30, 1986
The polymetallic systems involving 2,2'-bipyridine (bpm) have shown only one breakthrough in the previous twelve-month period. We have, however, been successful with one such synthetic procedure in that we have recently prepared (bpy)/sub 2/Ru(bpm)Rh(PPh/sub 3/)/sub 2/H/sub 2//sup 3 +/. An additional study involved systems in which bpm is bridged to tetracyanoferrate units. Because of the difficulty in deprotonating 2,2'-biimidazole and 2,2'-bibenzenebiimidazole, we have discontinued work with these anionic ligands. We are attempting to prepare the 4,4',5,5'-tetracyano derivative which should undergo more facile deprotonation and supply a good di-negatively charged bridging ligand. We have experienced a substantial progress in the proposed research using 2,3-bis(2'-pyridyl)pyrazine as a bridging ligand. This ligand has been used to couple Ru(II) units to form L/sub 2/Ru(dpp)RuL'/sup 4 +/ units L = bpy or phen, to couple Fe(II) units to form (Fe(CN)/sub 4/)/sub 2/dpp/sup 2 +/ and to couple the heterometallic system, (bpy)/sub 2/RudppFe(CN)/sub 4/. These systems show extensive metal-metal coupling through electrochemical studies, emission maxima that depend upon the M(dpp)M' linkage, and lifetimes in the 50 to 200 ns region in acetonitrile at room temperature.
- Research Organization:
- Clemson Univ., SC (USA). Dept. of Chemistry and Geology
- DOE Contract Number:
- AS09-80ER10671
- OSTI ID:
- 5456386
- Report Number(s):
- DOE/ER/10671-4; ON: DE86013217
- Country of Publication:
- United States
- Language:
- English
Similar Records
Development of novel Fe, Co, Ir, and Ru complexes for the capture and utilization of solar energy
Osmium(II)/Ruthenium(II) trimetallics incorporating polyazine bridging ligands: Isovalent near-IR absorbers with unique electrochemical behavior
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
08 HYDROGEN
BIPYRIDINES
CHEMICAL PREPARATION
HYDROGEN PRODUCTION
PHOTOCHEMICAL REACTIONS
IRON COMPLEXES
ENERGY TRANSFER
RHODIUM COMPLEXES
RUTHENIUM COMPLEXES
IMIDAZOLES
LIGANDS
AZINES
AZOLES
CHEMICAL REACTIONS
COMPLEXES
HETEROCYCLIC COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
080106 - Hydrogen- Production- Biosynthesis & Photochemical Processes