期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 149, 期 -, 页码 231-239出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2015.04.040
关键词
Uridine; Carboxy phenoxy phthalocyanine; Triplet quantum yields; Singlet oxygen quantum yields and triplet lifetime
类别
资金
- Department of Science and Technology (DST)
- National Research Foundation (NRF) of South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology [62620]
- Rhodes University
- DST/Mintek Nanotechnology Innovation Centre (NIC) - Sensors, South Africa
- Organization for Women in Science in the Developing World (OWSD)
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 is 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. (C) 2015 Elsevier B.V. All rights reserved.
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