The indole oligomers were synthesized by an effective green route in the water medium. This is an effort to synthesize commercially important indole oligomers without using any harmful chemicals and artificial media. The lanthanide chlorides such as LaCl3·7H2O, CeCl3·7H2O, PrCl3·6H2O and NdCl3·6H2O were used in the synthesis procedure to minimize the reaction time. Unlike the previous works, these reactions occurred at somewhat elevated temperature. In the reaction, the salts of lanthanide metals acted as a catalyst and further behave as dopants. These dopants increased the various properties (like conducting behavior) of the oligomers. The synthesized hetero-oligomers were characterized by different physicochemical and spectral techniques. The luminescence phenomenon was studied by the absorbance, excitation and emission peaks, justifying the upconversion phenomenon. The conducting behavior of these oligomers was studied at different concentrations to observe the dependence of the conduction of electrons at various concentrations. In this manuscript, we first time introduced the LnCl3·xH2O to observe their behavior towards the reaction procedure, their doping behavior and the morphology of the synthesized oligomer particles. This study is an effort to synthesize the valuable indole oligomer via a more convenient way, which can be applicable in the field of luminescence, conductance, etc.
Ameen, Iffat; Mishra, Raj Laxmi; Tripathi, Abhishek K.; Siddiqui, Afshan; and Tripathi, Umesh N.
"Photo-physical properties of lanthanides doped O-bridged conducting indole oligomer,"
Karbala International Journal of Modern Science: Vol. 6
, Article 14.
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