Tuesday , 5 March 2024

Studies on the molecular interaction of Neutral Red with surfactants

Papiya Jana1, V. Padmavathy2 and Asok K. Jana2*
1Department of Chemistry, Sri Manakula Vinayagar Engineering College, Pondicherry 605 107, India
2Department of Chemistry, Kanchi Mamunivar Centre for Post-Graduate Studies, Pondicherry-605 008, India 

The spectrophotometric studies of neutral red (NR) dye in an aqueous solution containing three different types of surfactants such as CTAB (cationic), SLS (anionic) and Triton X-100 (TX-100), Tween-20, 40,60 and 80 (nonionic) show that NR forms a 1:1 molecular complex with TX-100, Tweens and SLS. Such a type of interaction is absent in NR and CTAB. The thermodynamic and spectrophotometric properties of these complexes suggest that NR forms a strong charge transfer (CT) complex with TX-100 and Tweens whereas the interaction of NR with SLS is columbic in nature. Photogalvanic and photoconductometric studies also support the above interactions. In addition to this, the electron donating ability among the nonionic surfactants i.e., TX -100 and Tweens towards dye, role of surface in CT interaction between NR and nonionic surfactants have been pointed out.
Keywords: Neutral Red, CT interaction, cac, Photogalvanic, Isosbestic point

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