Photophysical properties of zinc phthalocyanine-uridine single walled carbon nanotube--conjugates

Racheal O Ogbodu; Edith K Amuhaya; Philani Mashazi; Tebello Nyokong

doi:10.1016/j.saa.2015.04.040

Photophysical properties of zinc phthalocyanine-uridine single walled carbon nanotube--conjugates

Spectrochim Acta A Mol Biomol Spectrosc. 2015:149:231-9. doi: 10.1016/j.saa.2015.04.040. Epub 2015 Apr 24.

Authors

Racheal O Ogbodu¹, Edith K Amuhaya¹, Philani Mashazi¹, Tebello Nyokong²

Affiliations

¹ Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa.
² Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa. Electronic address: t.nyokong@ru.ac.za.

PMID: 25965170
DOI: 10.1016/j.saa.2015.04.040

Abstract

The photophysical properties of the conjugate of uridine and zinc mono carboxy phenoxy phthalocyanine (ZnMCPPc-uridine, 4) are reported in this work. The conjugate was also adsorbed onto single walled carbon nanotubes (ZnMCPPc-uridine-SWCNT, 5). The X-ray photoelectron spectroscopy of 4 showed three N 1s peaks while that of 5 showed four N 1s peak, a new peak at 399.4 eV of 5 was assigned to pyrrolidonic nitrogen, due to the interaction of the pyrrolic nitrogen of 4 with the oxygen moiety of SWCNT-COOH in 5. The triplet lifetime, triplet and singlet oxygen quantum yields of the zinc mono carboxy phenoxy phthalocyanine increased by over 40% in the presence of uridine. SWCNTs resulted in only a small quenching of the triplet state parameters of 4.

Keywords: Carboxy phenoxy phthalocyanine; Singlet oxygen quantum yields and triplet lifetime; Triplet quantum yields; Uridine.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Indoles / chemistry*
Isoindoles
Nanotubes, Carbon / chemistry*
Organometallic Compounds / chemistry*
Photoelectron Spectroscopy
Singlet Oxygen / chemistry
Uridine / chemistry*
Zinc Compounds

Substances

Indoles
Isoindoles
Nanotubes, Carbon
Organometallic Compounds
Zinc Compounds
Zn(II)-phthalocyanine
Singlet Oxygen
Uridine