DFT study of the effect of substituents on the absorption and emission spectra of Indigo

Chemistry Central Journal

Daniel Glossman-Mitnik¹  Francisco Cervantes-Navarro¹ 

[1]NANOCOSMOS Virtual Lab, Centro de Investigación en Materiales Avanzados, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua, Chih 31109, Mexico

关键词: CIS;    DFT;    Effect of substituents;    Emission spectra;    Absorption spectra;    Indigo;   

Others  :  788106
DOI  :  10.1186/1752-153X-6-70

 received in 2012-04-06, accepted in 2012-06-19,  发布年份 2012

【 摘 要 】

Background

Theoretical analyses of the indigo dye molecule and its derivatives with Chlorine (Cl), Sulfur (S), Selenium (Se) and Bromine (Br) substituents, as well as an analysis of the Hemi-Indigo molecule, were performed using the Gaussian 03 software package.

Results

Calculations were performed based on the framework of density functional theory (DFT) with the Becke 3- parameter-Lee-Yang-Parr (B3LYP) functional, where the 6-31 G(d,p) basis set was employed. The configuration interaction singles (CIS) method with the same basis set was employed for the analysis of excited states and for the acquisition of the emission spectra.

Conclusions

The presented absorption and emission spectra were affected by the substitution position. When a hydrogen atom of the molecule was substituted by Cl or Br, practically no change in the absorbed and emitted energies relative to those of the indigo molecule were observed; however, when N was substituted by S or Se, the absorbed and emitted energies increased.

【 授权许可】

   
2012 Cervantes-Navarro and Glossman-Mitnik; licensee Chemistry Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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