Synthesis and photophysical behaviour of tantalum and titanium phthalocyanines in the presence of gold nanoparticles: Photocatalysis towards the oxidation of cyclohexene

Chauke V. P., Arslanoglu Y., NYOKONG T.

JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, vol.221, no.1, pp.38-46, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 221 Issue: 1
  • Publication Date: 2011
  • Doi Number: 10.1016/j.jphotochem.2011.04.020
  • Journal Name: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.38-46
  • Keywords: Tantalum, Titanium, Phthalocyanines, Gold nanoparticles, Singlet oxygen quantum yield, Photocatalysis, Photodegradation, Triplet quantum yields, Triplet lifetimes, Cyclohexene, COMPLEXES, NANOCRYSTALS, SPECTROSCOPY, DERIVATIVES, PORPHYRIN, SINGLET, OXYGEN
  • Istanbul Technical University Affiliated: No

Abstract

We report on the synthesis of 2,(3)- (peripheral) and 1,(4)- (non-peripheral) (2-mercaptopyridine)phthalocyanine complexes of titanium (IV) oxide (5 and 6 respectively), and tantalum (III) hydroxide (7, peripheral only), their photochemical and photophysical parameters and the photocatalytic oxidation of cyclohexene in the presence of gold nanoparticles (AuNPs). The singlet oxygen quantum yield values increased in the presence of AuNPs, for complexes 5 and 6. The percentage conversion values for cyclohexene using 5, 6 and 7 were 27%, 20% and 14%, respectively. These values increased considerably in the presence of AuNPs, except complex for 7. The products obtained include cyclohexene oxide, 2-cyclohexen-1-ol, 2-cyclohexene-1-one and 1,2-cyclohexanediol. Low values of singlet oxygen quantum yields favour the formation of 1,2-cyclohexanediol. (C) 2011 Elsevier B.V. All rights reserved.