**7. References**

410 Advanced Aspects of Spectroscopy

assemblies and PDT [195].

optical profile of the photosensitizers.

**Acknowledgment** 

**Author details** 

Juliana P. Lyon

Ana Paula Romani

Leonardo M. Moreira

*São João Del Rei, MG, Brazil* 

*São João Del Rei, MG, Brazil* 

*Departamento de Ciências Naturais (DCNAT), Universidade Federal de São João Del Rei (UFSJ),* 

**6. Conclusions** 

the interest in terms of application [194]. In fact, phthalocyanines are very versatile chemical systems, which allow great variability of adjustment of properties in the process of chemical synthesis. This great number of structural possibilities has been utilized in many fields, since the different phthalocyanines can be applied in quite different areas, such as gas sensors, semiconductor materials, photovoltaic cells, liquid crystals, optical limiting devices, molecular electronics, non-linear optical applications, Langmuir-Blodgett films, fibrous

The selection of photosensitizers that are more able to generate an efficient photodynamic action is one of the main questions involving PDT in the present days. The novel generations of photosensitizers is aiming to obtain the maximum quantum yield through the therapeutic window, avoiding spectral ranges that are absorbed by endogenous dyes, such as hemoglobin and melanin. In this way, the previous knowledge regarding the spectroscopic behavior of the new prototypes of photosensitizers is a relevant pre-requisite to the advancement of the types of applications and its respective repercussions, since the efficacy of the methodology depends on the capability of generations of reactive oxygen species (ROS) and reactive nitrogen species (RNS), which are intrinsically related to the

Hueder Paulo Moisés de Oliveira thanks to the financial support propitiated by FAPESP (Project of research support 06/56701-3) and to CNPq to the research grants (479655/2008-1). Thanks to Msc Sandra Cruz dos Santos and Luiza Rosimeri Romano Santin to the revisions.

The author Máira Regina Rodrigues thanks CNPq and FAPESP for the financial support.

*Departamento de Zootecnia (DEZOO), Universidade Federal de São João Del Rei (UFSJ),* 

*Universidade Federal de Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto , MG, Brazil* 

Thanks also FFCLRP-USP, Prof. Amando Siuiti Ito´s laboratory.

*Departamento de Química - Instituto de Ciências Exatas e Biológicas,* 


<sup>\*</sup> Corresponding Author


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