Quinoline Schiff-base ligands as long-wavelength photosensitizers for diphenyliodonium salt

Temel B., Kurt B., Akar I., Keklik M.

Journal of Photochemistry and Photobiology A: Chemistry, vol.400, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 400
  • Publication Date: 2020
  • Doi Number: 10.1016/j.jphotochem.2020.112715
  • Journal Name: Journal of Photochemistry and Photobiology A: Chemistry
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Agricultural & Environmental Science Database, BIOSIS, Chemical Abstracts Core, Chimica, INSPEC
  • Keywords: Photosensitization, Cationic polymerization, Schiff-base ligands, Diphenyliodonium salt, PROMOTED CATIONIC-POLYMERIZATION, CYCLOHEXENE OXIDE, PHOTOINITIATORS, ELECTRON, PYRIDINIUM, COMPLEXES, DERIVATIVES, INITIATORS, SYSTEMS
  • Bezmialem Vakıf University Affiliated: Yes

Abstract

This study describes the use of quinoline Schiff-base ligands as photosensitizers for diphenyliodonium salt using long-wavelength UV light 4-Bromo-2-((quinolin-8-ylimino)methyl)phenol (BQIP) and 2-methoxy-6-((quinolin-8-ylimino)methyl)phenol (MQIP) were synthesized and characterized by H-1 NMR, C-13 NMR, FT-IR, UV-vis and fluorescence measurements. The cationic polymerization of cyclohexene oxide monomer was initiated at room temperature upon LED exposure (395-480 nm) in the presence of BQIP/MQIP and diphenyliodonium hexa-fluorophosphate (DPI+PF6-). Free energy change (Delta G(s)) calculations revealed that electron transfer from singlet excited states of the Schiff-bases to DPI+PF6- is thermodynamically favorable.