## 3 Results and Discussion
Disperse Blue 359 exhibited a dihedral angle of 0.1\({}^{\circ}\) between anthracene-9,10-dione and the alkylamine, indicating a nearly planar structure. By contrast, the structures of BAPCP and HAPCP showed a slight twist, with a dihedral angle of approximately 13\({}^{\circ}\) between the pyrrole and phenyl groups, and a highly twisted configuration with a dihedral angle of about 87\({}^{\circ}\) between the phenyl and dialkylamine groups. While Disperse Blue 359 has a planar structure, the synthesized materials exhibit highly twisted structures, which are advantageous for interactions with solvents. As a result, the twisted configuration effectively prevents molecular stacking during film formation, inhibiting molecular packing and reducing aggregation in the solid state. By minimizing the negative effects of light scattering due to molecular aggregation, it is expected that the optical properties related to the color quality of the colorant will be enhanced. The electron density of the highest occupied molecular orbital (HOMO) in the synthesized materials is distributed across the pyrrole and the electron-donating dialkyl amine groups. By contrast, the electron density distribution of the lowest unoccupied molecular orbital (LUMO) is less localized on the dialkyl amine compared to the HOMO. The dialkyl amine exhibits an electron-donating effect, resulting in electron cloud presence in the HOMO; however, in the LUMO, the electron cloud is less pronounced than in the HOMO. DFT calculations yielded LUMO values of \(-\)3.64 eV and \(-\)3.62 eV for BAPCP and HAPCP, respectively, while the HOMO values were \(-\)6.04 eV and \(-\)6.02 eV, with corresponding band gaps of 2.39 eV and 2.40 eV. The experimental HOMO and LUMO values of the synthesized compounds were measured and calculated using cyclic voltammetry and absorption spectra. Figures 5 and 6 present the cyclic voltammograms of the synthesized materials recorded at a scan rate of 100 mV/s to assess their electrochemical properties. The HOMO values, derived from the onset of oxidation, were \(-\)4.66 eV for BAPCP and \(-\)4.63 eV for HAPCP. The optical band gaps, calculated from the absorption edge, yielded experimental values of 1.79 eV for BAPCP and 1.80 eV for HAPCP. The LUMO values were calculated using the optical band gap and HOMO values, resulting in \(-\)2.87 eV for BAPCP and \(-\)2.83 eV for HAPCP. These values show a consistent trend with the DFT calculations. To further investigate the electrochemical properties of the synthesized materials, cyclic voltammograms were measured at scan rates ranging from 30 to 150 mV/s. As the scan rate increased, both the oxidation and reduction current values increased, while the onset values remained consistent, confirming that the current response is proportional to the scan rate. To assess the electrochemical stability of the synthesized materials, cyclic voltammograms were repeated 30 times at a scan rate of 100 mV/s, showing consistent curves and confirming the electrochemical stability of the materials. During both the manufacturing process and operational use, color filters for image sensors can \begin{table}
\begin{tabular}{c c c} \hline  & \multicolumn{3}{c}{**Transmittance [\%]**} \\  & **450 nm** & **650 nm** \\ \hline Disperse Blue 359 & 99.6 & 17.2 \\ BAPCP & 88.6 & 0.73 \\ HAPCP & 99.6 & 0.36 \\ \hline \end{tabular}
\end{table} 
Table 2: Transmittance of Disperse Blue 359 and synthesized materials in PGMEA solution at a concentration of 1 \(\times\) 10\({}^{-4}\) M.  
be exposed to light, potentially generating radical cation and radical anion states. Thus, assessing stability under electrochemical conditions provides useful insights into material durability. In this study, consecutive CV scans conducted up to 30 cycles demonstrated stable cycling behavior. This finding indirectly suggests that the synthesized compound is stable when reverting from radical cation or radical anion states to its neutral state after photochemical decomposition.