NDLI: Air-stable poly(3,3,3-trifluoropropylsilyne) homo- and copolymers

Content Provider	Royal Society of Chemistry (RSC)
Author	Kawabe, Takuma Kwak, Giseop Fujimoto, Yuji Fujiki, Michiya Saxena, Anubhav
Copyright Year	2012
Abstract	A soluble Si–Si bonded polymer (polysilyne, SNP) bearing n-butyl groups (BSNP) has been reported to exhibit a green photoluminescence (PL) at 540 nm (2.30 eV). However, BSNP gradually changed to a colorless solid because of auto-oxidation within a few weeks when the polymer was stored in the absence of light without special care. Herein, we demonstrate the photophysical properties of SNP carrying 3,3,3-trifluoropropyl (TFP) side groups (FSNP), which remains unaffected by auto-oxidation. This stability against oxidation may be possibly attributable to intra- and inter-molecular CF–Si interactions between the electron-donating Si–Si main chain and the electron withdrawing TFP side groups. FSNP in polar tetrahydrofuran (THF) exhibited an almost pure-blue PL peak at 450 nm (2.76 eV), whereas in non-polar n-octane, it emitted a near-UV peak at 337 nm (3.68 eV), possibly, because of the CF–Si interactions. Additionally, thin films of FSNP exposed to air and in THF exhibited excellent resistance to air oxidation for at least one month, as determined by the lack of any changes in its PL, IR, and Raman spectra. From Gaussian03 calculations (TD-DFT, 6-31G* basis set, B3LYP) of trans-perhydrosiladecaline partially substituted with TFP and n-butyl groups as models of FSNP and BSNP, the most essential roles of TFP groups suggested that (i) the lowest Siσ–Siσ* transition state becomes the allowed transition by introducing strong polarity to the SNP skeleton and (ii) both the HOMO and LUMO energy levels are significantly stabilized, which provides the observed stability toward air oxidation. The air stability was effective in copolymers carrying TFP and n-butyl groups (FBSNP). However, FSNP and FBSNP that had been pyrolysed at temperatures greater than 500 °C exhibited no such air stability because of the loss of the TFP groups.
Starting Page	3256
Ending Page	3265
Page Count	10
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	3
Issue Number	12
Journal	Polymer Chemistry
DOI	10.1039/c2py20508d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Octane HOMO\/LUMO Photoluminescence Electronvolt Polymer Single-nucleotide polymorphism BSNP FSNP Chemistry THF SNP Tetrahydrofuran Raman
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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