Photophysical properties of a novel axially substituted tetra-α-(pentyloxy) Titanium(IV) Phthalocyanine - Hematoxylin

6th conference on Advances in Optoelectronics and Micro/nano-optics

Jiang, Yufeng^1 ; Lv, Huafei^1 ; Yu, Xinxin^1 ; Pan, Sujuan^1 ; Zhang, Tiantian^1 ; Huang, Yide^2 ; Wang, Yuhua^2 ; Xie, Shusen^2 ; Yang, Hongqin^2 ; Peng, Yiru^1

College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou

350007, China^1

Key Laboratory of Optoelectronic Science and Technology, Medicine of Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou

350007, China^2

关键词: Excited state lifetimes;    Fluorescence intensities;    Fluorescence lifetimes;    Metalphthalocyanines;    Molecular aggregation;    Peripheral positions;    Photophysical properties;    Pi-conjugated system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/844/1/012049/pdf
DOI  :  10.1088/1742-6596/844/1/012049

来源: IOP

【 摘 要 】

Metal phthalocyanines (MPcs) are a very important class of widespread application compounds. They are not only used as dyes but also used as catalysts, data storage, electron charge carriers in photocopiers, photoconductors in chemical sensors, and photo-antenna devices in photosysthesis, photovoltaic cells. A particular application of Pcs is that it was used as a photosensitizers (PS) for treatment of certain cancer by photodynamic therapy of cancer and non-cancer diseases. However, the molecular aggregation of phthalocyanines, which is an intrinsic property of these large π-π conjugated systems, provides an efficient non-radioactive energy relaxation pathway, thereby shortening the excited state lifetimes, and reducing the photosensitizing and target efficiency. To overcome these problems, the introduction of axial ligands to phthalocyanine can prevent the formation of aggregation to some extend. In this paper, hematoxylin axially substituted tetra-α-(pentoxy) titanium (IV) phthalocyanine (TiPc(OC5H11)4-Hematoxylin) were characterized by elemental analysis, IR,1H NMR, UV-Vis, fluorescence spectra. No obviously Q band change was observed after the hematoxylin was substituted at the peripheral position of substituted phthalocyanine ring. Because of the rigidity structure of the hematoxylin, the fluorescence intensity of hematoxylin peripheral substituted phthalocyanine decreased compared with free substituted phthalocyanines. The fluorescence lifetimes of axially substituted phthalocyanine was fitted to be 3.613 ns. This compound may be considered as a promising photosensitizer for PDT.