1:1 hosts-guest inclusion complexation behavior of 1-butyl-pyridinium bromide (IL) as a guest with 18-crown-6 and dibenzo-18-crown-6 as hosts in acetonitrile media has been demonstrated here and are exceedingly suitable for diverse application in modern sciences. Conductivity and surface tension measurements show that 1:1 stoichiometric complexes are formed between IL and crown. The nature of the complexes has been established using thermodynamic parameters obtained from physicochemical studies. Enthalpy (ΔH⁰), entropy (ΔS⁰) and free energy change (ΔG⁰) of the complexation reaction has been evaluated from the temperature dependent formation constant data.