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    • Keywords

       

      𝛽-cyclodextrin; dioxalatodiaquochromate(III); inclusion complex; characteristics development.

    • Abstract

       

      An investigation on the effect of 𝛽-cyclodextrin (CD) in both free and inclusion-complexed forms with a guest anionic metal complex, dioxalatodiaquochromate(III) (DDC), on the characteristics of conducting 2–polyaniline (PANI) is carried out. Four materials, PANI (i.e. PANI–SO4), PANI–DDC, PANI–CD and PANI–CD + DDC were prepared by in situ chemical oxidative polymerization in aqueous H2SO4 at pH 1 and subjected to electrical conductivity and spectral (IR and UV-vis) measurements. DDC and CD when separately incorporated, reduce the conductivity of PANI by about half whilst their inclusion complex CD + DDC enhances it. Spectral characterization reveals that DDC as a dopant and CD as an encapsule exhibit their effects through adverse interaction with imine–amine N centres and benzenoid moiety of PANI. The inclusion complex CD + DDC, on the contrary, functions as a dopant by lying in between the chains and seems to promote the extended conformation of PANI chain and hence the 𝜋-electron delocalization. Exposure of the material to methanol vapour causes a decrease in conductivity in PANI and PANI–CD while an increase in PANI–CD + DDC. This study makes explicit the distinct role of CD as an encapsule and CD + DDC inclusion complex as a dopant in altering the electrical property of PANI.

    • Author Affiliations

       

      E Subramanian1 G Anitha1 M Karthik Selvam1 M Ibrahim Ali Badusha1

      1. Department of Chemistry, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli 627 012, India
    • Dates

       
  • Bulletin of Materials Science | News

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