1：Experimental Design and Method Selection:

The study involved synthesizing two thiazole derivatives using nucleophilic substitution and Sonogashira coupling-aminovinylation methods, followed by characterization using various spectroscopic and thermal analysis techniques to evaluate optical and thermal properties.

2：Sample Selection and Data Sources:

Compounds were synthesized from purchased chemicals; samples were prepared in acetonitrile for UV-vis analysis and in deuterated CDCl3 for NMR.

3：List of Experimental Equipment and Materials:

Equipment includes Agilent Technologies Cary 630 FTIR, Shimadzu UV-vis 1601 spectrophotometer, Delta JEOL USA NMR spectrometer, STA 8000 thermal analyzer, Agilent 6520 Accurate-Mass Q-TOF LCMS. Materials include 2-bromo-5-nitrothiazole, triethylamine, diethylamine, 2-bromo-4-nitroacetophenone, phenylacetylene, copper(I) iodide, bis(triphenylphosphine)palladium(II) dichloride, ammonium thiocyanate, p-toluidine, acetone, THF, methanol, dichloromethane, acetonitrile, CDCl

4：Experimental Procedures and Operational Workflow:

Synthesis of compound 1 involved refluxing ammonium thiocyanate and 2-bromo-4-nitroacetophenone in acetone, followed by addition of p-toluidine, precipitation, and purification. Synthesis of compound 2 involved Sonogashira coupling of phenylacetylene with 2-bromo-5-nitrothiazole using catalysts, followed by addition of diethylamine, reflux, evaporation, and chromatography. Characterization included IR, UV-vis, NMR, thermal analysis, and mass spectrometry.

5：Data Analysis Methods:

Data were analyzed using standard spectroscopic and thermal analysis techniques; chemical shifts and absorption wavelengths were interpreted, and thermal stability was assessed based on decomposition temperatures.