2H1NA/β-cyclodextrin inclusion complex: Preparation, characterization and chemosensory application for detecting Ag⁺

ABSTRACT

The inclusion complex of 2-hydroxy-1-naphthoic acid (2H1NA) with β-cyclodextrin (β-CD) has been investigated using UV-visible and fluorescence spectral techniques in liquid states, FTIR, NMR, XRD and SEM techniques in solid state, molecular docking techniques in virtual states. The binding constants of for the formation of 1:1 2H1NA:β-CD inclusion complex is estimated by UV-visible and fluorescence spectral techniques. The chemosensory power of 2H1NA:β-CD complex was investigated thoroughly for various metal cations and we found the emission of complex showed a drastic increase in the intensity for Ag⁺. Competition experiments of 2H1NA:β-CD complex with Ag⁺ in presence of other metal ions (Na⁺, K⁺, Hg⁺, Al²⁺, Ca²⁺, Ba²⁺, Cd²⁺, Co²⁺, Fe²⁺, Hg²⁺, Mg²⁺, Mn²⁺, Ni²⁺, Pb²⁺, Sn²⁺, Ti²⁺, Zn²⁺, Cr³⁺, Fe³⁺) showed that no significant variation was found in the fluoresce intensity of 2H1NA:β-CD complex upon adding all other cations. The linearity range, LOD and LOQ are determined from the selectivity and sensitivity studies for Ag⁺. Our result suggests that the 2H1NA:β-CD inclusion complex would be promising material for developing solid state sensory device for sensing Ag⁺.

KEYWORDS:

• 2-Hydroxy-1-naphthoic acid
• chemosensor
• β-cyclodextrin
• fluorescence enhancement
• silver ion