Open Access Open Access  Restricted Access Subscription Access

Synthesis and Photophysical Properties of Fluorene or Carbazole-Based Alternating Copolymers Containing Si and Ethynylene Units in the Main Chain


Affiliations
1 Department of Applied Chemistry, Materials Science Course, College of Engineering, Shibaura Institute of Technology, Tokyo, Japan
 

Alternating copolymerization of 9,9-dihexyl-2,7-dibromofluorene, N-hexyl-2,7-dibromocarbazole (HCz) with diethynyldimethylsilane, diethynyldiphenylsilane, has been investigated using Sonogashira coupling reaction. Photophysical properties of the resulting copolymers were investigated with UV-Vis absorption and photoluminescence spectroscopy. All the copolymers in chloroform solution showed absorption peaks at 270 - 280 nm with shoulder peaks at around 380 nm derived from π-π* transition or intra-molecular charge transfer through σ-π moiety, respectively. The chloroform solutions of the copolymers showed broad emission peaks at 415 - 425 nm. The emission wave lengths of the copolymers in the solid state (cast film) detected at 360 - 385 nm were remarkably blue-shifted in comparison with those in the chloroform solutions. Hydrosilylation reaction of the copolymers with 1,4-bis(dimethylsilyl)benzene yielded networked copolymers soluble in chloroform, indicating formation of branching polymers. The chloroform solutions of the HCz-based networked copolymers showed bimodal emission derived from new highly energy states in the σ-π conjugation.

Keywords

Fluorene, Carbazole, Alternating Copolymer, Si-Ethynylene, Photophysical Property, Network Polymer.
User
Notifications
Font Size

Abstract Views: 88

PDF Views: 0




  • Synthesis and Photophysical Properties of Fluorene or Carbazole-Based Alternating Copolymers Containing Si and Ethynylene Units in the Main Chain

Abstract Views: 88  |  PDF Views: 0

Authors

Naofumi Naga
Department of Applied Chemistry, Materials Science Course, College of Engineering, Shibaura Institute of Technology, Tokyo, Japan
Nanae Tagaya
Department of Applied Chemistry, Materials Science Course, College of Engineering, Shibaura Institute of Technology, Tokyo, Japan
Haruhiko Tomoda
Department of Applied Chemistry, Materials Science Course, College of Engineering, Shibaura Institute of Technology, Tokyo, Japan

Abstract


Alternating copolymerization of 9,9-dihexyl-2,7-dibromofluorene, N-hexyl-2,7-dibromocarbazole (HCz) with diethynyldimethylsilane, diethynyldiphenylsilane, has been investigated using Sonogashira coupling reaction. Photophysical properties of the resulting copolymers were investigated with UV-Vis absorption and photoluminescence spectroscopy. All the copolymers in chloroform solution showed absorption peaks at 270 - 280 nm with shoulder peaks at around 380 nm derived from π-π* transition or intra-molecular charge transfer through σ-π moiety, respectively. The chloroform solutions of the copolymers showed broad emission peaks at 415 - 425 nm. The emission wave lengths of the copolymers in the solid state (cast film) detected at 360 - 385 nm were remarkably blue-shifted in comparison with those in the chloroform solutions. Hydrosilylation reaction of the copolymers with 1,4-bis(dimethylsilyl)benzene yielded networked copolymers soluble in chloroform, indicating formation of branching polymers. The chloroform solutions of the HCz-based networked copolymers showed bimodal emission derived from new highly energy states in the σ-π conjugation.

Keywords


Fluorene, Carbazole, Alternating Copolymer, Si-Ethynylene, Photophysical Property, Network Polymer.