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One-dimensional supramolecular assemblies based on a Re2(III,III) synthon and their solid-state phosphorescence.
Michael Q Dequeant1, Robert McGuire, David R McMillin
1Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA.
Inorganic Chemistry
|September 15, 2005
Summary
New coordination polymers containing rhenium (Re) were synthesized. These novel materials exhibit blue-shifted phosphorescence, differing from previous rhenium compounds.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Coordination Chemistry
Background:
- Rhenium-rhenium quadruple bonds are known for unique photophysical properties.
- Coordination polymers offer tunable electronic and optical characteristics.
- Dimethylbenzamidinate (DMBA) ligands stabilize dinuclear rhenium complexes.
Purpose of the Study:
- To synthesize novel one-dimensional coordination polymers utilizing dinuclear rhenium complexes.
- To investigate the photoluminescent properties of these new materials.
- To compare the phosphorescence of the new polymers with existing rhenium compounds.
Main Methods:
- Reaction of Re2(DMBA)4(NO3)2 with tungstate or terephthalate dianions.
- Formation of one-dimensional coordination polymers through bridging ligands.
- Spectroscopic analysis to characterize phosphorescence emission.
Main Results:
- Successful synthesis of two new coordination polymers: [Re2(DMBA)4(mu-O,O'-WO4)] and [Re2(DMBA)4(mu-O,O'-1,4-(O2C)2C6H4)].
- Both polymers exhibit phosphorescence originating from a 3(delta --> delta*) excited state.
- The observed phosphorescence is significantly blue-shifted compared to Re2(DMBA)4Cl2 compounds.
Conclusions:
- Dinuclear rhenium complexes can be effectively incorporated into one-dimensional coordination polymers.
- The nature of the bridging dianion influences the photophysical properties, specifically the emission wavelength.
- These findings expand the scope of rhenium-based phosphorescent materials.