Effect of phosphine ligand on the optical absorption/emission properties of platinum-containing conjugated polymers
| Autor: | Tatsuo Yajima, Taichi Sotani, Natsuhiro Sano, Yu Miyagi, Fumio Sanda |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Aryl Organic Chemistry Bioengineering 02 engineering and technology Polymer Conjugated system 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 0104 chemical sciences chemistry.chemical_compound Monomer chemistry Polymerization Dynamic light scattering Polymer chemistry 0210 nano-technology Alkyl Phosphine |
| Zdroj: | Polymer Chemistry. 9:1772-1779 |
| ISSN: | 1759-9962 1759-9954 |
| DOI: | 10.1039/c7py01886j |
| Popis: | The Sonogashira–Hagihara coupling polymerization of a D-hydroxyphenylglycine-derived diiodoarylene monomer and platinum-containing diethynylphenylene monomers with various substituents, HCC–C6H4–CC–Pt(PR3)2–CC–C6H4–CCH, 1: R = C4H9, 2: R = C8H17, 3: R = cyclohexyl, 4: R = phenyl, and 5: R = 4-methoxyphenyl, gave the corresponding polymers 1′–5′ with number-average molecular weights of 4600–22 000. The polymers were soluble in CHCl3, CH2Cl2, THF and DMF. CD/UV–vis spectroscopic analysis and dynamic light scattering measurements revealed that 1′–5′ formed chirally regulated unimolecular structures in THF/toluene mixtures, while formed chiral aggregates in THF/MeOH mixtures. The conjugation of the polymer main chain was longer for monomers with aryl groups bonded to P compared to monomers with alkyl groups bonded to P. The relationship between the HOMO–LUMO gaps and phosphine ligands was reasonably explained by DFT calculations. The polymers exhibited photoluminescence with quantum yields ranging from 0.003% to 0.9%. The photoluminescence intensity was controlled by changing the phosphine substituents. The thermal stability of the polymers increased and the refractive index decreased as the alkyl chain length of the phosphine ligand was increased. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|