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In the title compound, C6H6BrNO, the Br atom is displaced from the pyridine ring mean plane by 0.0948 (3) Å, while the hydroxyl O atom and the methyl C atom are displaced by 0.0173 (19) and 0.015 (3) Å, respectively. In the crystal, mol­ecules are linked via O—H⋯N hydrogen bonds, forming chains propagating along the a-axis direction. These chains are linked by C—H⋯Br hydrogen bonds, forming corrugated two-dimensional networks lying parallel to the ac plane.

In this article, we report intermolecular interactions in terms of the effect of benzfused heterocyclic compounds, i.e., 2‐thioureidobenzimidazole and 2‐thioureidobenzoxazole (0.00, 0.01, and 0.05 mol kg−1), on the micellization behavior of sodium dodecylsulphate (SDS) (1–52 mmol kg−1) in dimethylsulphoxide (DMSO) at different temperatures (293.15–313.15 K) through conductometric and spectroscopic investigations. The variation of specific conductance with SDS concentration has been utilized to estimate the critical micelle concentration ( CMC). The above‐performed techniques infer that the presence of additives results in a decrease in the CMC values. Various standard thermodynamic parameters such as free energy change (), enthalpy change (), and entropy change () of micellization have been determined using the temperature dependence of CMC. The above calculated parameters and also UV–visible and fluorescence spectroscopy have been used to obtain information regarding the various interactions between the compounds and surfactant aggregates. In addition, an attempt has also been made to examine the minimum inhibitory concentration (MIC) of the heterocompounds, which indicates the effectiveness of these compounds against fungus growth at a particular concentration. These synthetic heterocyclic compounds find increasing applications in material science, medicinal chemistry, and biochemistry due to their antifungal and antioxidant properties.