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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photophysical and Photochemical Properties and Aggregation Behavior of Phthalocyanine and Naphthalocyanine Derivatives

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de Souza, Thalita F. M. [1] ; Antonio, Felipe C. T. [1] ; Zanotto, Mateus [1] ; Homem-de-Mello, Paula [1] ; Ribeiro, Anderson O. [1]
Total Authors: 5
[1] Univ Fed ABC UFABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, Bloco B, BR-09210170 Santo Andre, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 29, n. 6, p. 1199-1209, JUN 2018.
Web of Science Citations: 2

The photophysical and photochemical properties of phthalocyanine and naphthalocyanine with similar structures were studied in solution and with density-functional theory (DFT) computational method. The extended pi-conjugated system in naphthalocyanines causes a bathochromic shift in UV-Vis, emission and excitation bands, and promotes lesser generation of singlet oxygen in solution when compared to phthalocyanines. Time dependent DFT (TD-DFT) calculations point out the molecular orbitals involved in Q-band transition, corresponding to highest occupied molecular orbital (HOMO) to lowest unoccupied molecular orbital (LUMO) transition with a concentration of charge along x-axis, while the transition to LUMO+1 is in y-axis direction. The presence of tert-butyl substituents does not affect the molecular orbitals shape. but affect their energies. Aggregation studies in dimethyl sulfoxide (DMSO):water solutions showed that naphthalocyanines studied have more aggregation tendency than the phthalocyanines. DFT studies indicated that stacked-dimers are preferred to rotated-stacked conformation due the interaction between Zn-II and nitrogen atom from different monomers. (AU)

FAPESP's process: 14/18527-8 - Phthalocyanines and naphthalocyanines: synthesis and characterization of amphiphilic macrocyles for photodynamic therapy
Grantee:Anderson Orzari Ribeiro
Support type: Regular Research Grants
FAPESP's process: 12/50680-5 - Photosensitization in life sciences
Grantee:Mauricio da Silva Baptista
Support type: Research Projects - Thematic Grants