<p>This study provides a detailed analysis of the optical and dielectric properties of [N(C₂H₅)₄]₂CoCl to better understand its behavior in these domains. Crystals with a deep blue hue were synthesized through gradual evaporation at room temperature. X-ray diffraction analysis confirms that [N(C₂H₅)₄]₂CoCl adopts a non-centrosymmetric tetragonal structure under ambient conditions. Scanning transmission electron microscopy combined with energy-dispersive X-ray spectroscopy results show a consistent morphology across the crystal with no missing elements. Optical measurements reveal an optical bandgap of approximately 4.18 eV, pointing to potential uses in semiconductor technology. The Urbach energy is found to be 1.54 eV, indicating some level of disorder within [N(C₂H₅)₄]₂CoCl. Differential scanning calorimetry identifies phase transitions at specific temperatures. Additionally, we studied the dielectric properties of [N(C₂H₅)₄]₂CoCl across various temperatures. The imaginary component of the permittivity increases notably at lower frequencies, suggesting electrode polarization and space charge effects, which aligns with the non-Debye model. We also examined how the permittivity and dielectric loss vary with frequency. The temperature dependence of direct current conductivity, derived from the fitting of the imaginary component, follows an Arrhenius trend, with distinct changes at specific temperatures, as confirmed by the calorimetry results. This material holds promise for integration into devices such as photovoltaics, photodetectors, and light-emitting devices, where its unique optical and dielectric properties can be optimized for next-generation optoelectronic applications.</p>