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Vol. 38 No. 4 (2026): Vol 38 Issue 4, 2026

Copyright (c) 2026 Md. Delwar Hossen, Md. Minhajul Islam, Md. Jobayer Ahmed, Md. Alamgir Kabir, Md. Nuruzzaman Khan, Pijush Kanti Roy

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Complexation Study of 18-Crown-6 with Alkali Metal Ions in Ethanol + Water Binary Mixtures by Conductometric Technique and Assessment of Thermodynamic Parameters

https://doi.org/10.14233/ajchem.2026.35433
Md. Delwar Hossen
Department of Chemistry, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh
https://orcid.org/0009-0001-4796-1381
Md. Minhajul Islam
Department of Chemistry, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh
https://orcid.org/0009-0002-8942-9470
Md. Jobayer Ahmed
Department of Chemistry, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh
https://orcid.org/0009-0004-2541-723X
Md. Alamgir Kabir
Department of Chemistry, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh
https://orcid.org/0009-0006-3836-1508
Md. Nuruzzaman Khan
Department of Chemistry, Begum Rokeya University, Rangpur-5400, Bangladesh
https://orcid.org/0000-0002-5692-0952
Pijush Kanti Roy
Department of Chemistry, Mawlana Bhashani Science and Technology University, Santosh, Tangail-1902, Bangladesh
https://orcid.org/0000-0001-5906-5413

Corresponding Author(s) : Pijush Kanti Roy

pijushroy.chem@mbstu.ac.bd

Asian Journal of Chemistry, Vol. 38 No. 4 (2026): Vol 38 Issue 4, 2026

Abstract

A conductometric investigation of the complexation of two alkali metal ions with 18-crown-6 has been performed in binary ethanol + water solvent mixtures at four different temperatures viz. 303.15 K, 308.15 K, 313.15 K and 318.15 K. The conductance analysis revealed that 18-crown-6 forms 1:1 complexes with alkali metal ions. The molar conductance of K+ ion was higher than Na+ ion but the stability constant followed the reverse order. For every case, the stability constant decreases with increasing temperature. The stability constants for the CE-Na+ complexes followed the sequence 80% > 60% > 40% > 20% v/v at 303.15 K, while those for the CE-K+ complexes were 80% > 40% > 60% > 20% v/v at the same temperature. Thermodynamic parameters revealed that the values of Gibb’s free energy, enthalpy and entropy were negative, the spontaneity of the complexation process, exothermic in nature and thermodynamically favoured.

Keywords

18-Crown-6 Alkali metal Binary mixtures Stability constant Thermodynamic parameters Conductometry
(1)
Hossen, M. D.; Islam, M. M.; Ahmed, M. J.; Kabir, M. A.; Khan, M. N.; Roy, P. K. Complexation Study of 18-Crown-6 With Alkali Metal Ions in Ethanol + Water Binary Mixtures by Conductometric Technique and Assessment of Thermodynamic Parameters. ajc 2026, 38, 1052-1058.
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