A new fluorescent probe with stimulated emission and multiphoton absorption properties

• Published in: Chemical physics Vol. 382; no. 1; pp. 68 - 73
• Main Authors: Akbar Ali, S., Bisht, P.B., Senthilmurugan, A., Aidhen, I.S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 28.04.2011
• Subjects: Charge transfer property; Dimethylamino stilbene; Multiphoton emission; π-Conjugated systems; Dimethylamino stilbene; π-Conjugated systems; Charge transfer property; Multiphoton emission
• ISSN: 0301-0104
• DOI: 10.1016/j.chemphys.2011.02.012

Newly synthesized carbon analogue of methyl ester of methyl red ( trans-MDMASB molecule) exhibits large change in the dipole moment between the ground and excited state indicating the charge transfer character. It shows ns time-dependent red shift in polar viscous solvent. The amplified spontaneous emission has been observed on pumping with third harmonic of the ps Nd: YAG laser. The molecule also shows multiphoton induced emission on pumping at 1064 nm. [Display omitted] ► Carbon analogue of methyl ester of methyl red has been synthesized for the first time. ► The new molecule ( trans-MDMASB) shows large dipole moment difference of ∼20 D upon excitation. ► It shows ns time-dependent red shift in emission wavelength in DMSO solvent. ► The molecules exihibits stimulated emission and strong multiphoton induced emission. A newly synthesized donor–acceptor molecule ( E)-methyl 2-(4-(dimethylamino)styryl)benzoate ( trans-MDMASB) has been investigated in various non-polar and polar solvents. From the analysis of the solvent dependence of the absorption and fluorescence spectra, dipole moment change of approximately 20 D between the ground and excited state have been obtained indicating the charge transfer character of the excited state. The fluorescence spectra are found to be strongly dependent on the solvent polarity. The wavelength-dependent decay curves have been analysed to construct the time-resolved emission spectra (TRES) in a polar (and viscous) solvent. The molecule exhibits multiphoton induced emission on pumping its crystals with the fundamental of the ps Nd: YAG laser. The stimulated emission is observed on pumping its solution with the third harmonic of the laser.