Comparing the ratios of different conformers between compounds 4c-h and 4a-b reveals a reversal of the anti conformer in favor of the syn conformer when transitioning from compounds 4c-h to 4a-b. This inversion of conformers could be explained by the bulkier nature of the azoethylidine fragment (N=C(CH3)) compared to the azomethine fragment (N=CH). The graphical representation in Figure provides a comprehensive overview of the UVvisible absorption spectra for compounds 4a-h dissolved in DMSO at a concentration of 10 -3 M. Notably, all observed spectra exhibit a singular vibrational transition spanning the wavelength range of 475 to 800 nm, and the corresponding maximum absorption wavelengths are tabulated in Table .