1：Experimental Design and Method Selection:

The study involved synthesizing 2,5-dialkoxyterephthalates via alkylation, hydrolysis, chlorination, and condensation reactions. Photophysical properties were analyzed using UV-visible absorption and fluorescence spectroscopy, with theoretical calculations using density functional theory (DFT) to confirm intramolecular charge-transfer transitions. Polymerization was conducted to create blue fluorescent polyesters.

2：Sample Selection and Data Sources:

Samples included various dimethyl and diaryl 2,5-dialkoxyterephthalates synthesized from dimethyl 2,5-dihydroxyterephthalate, and polymers made from 2,5-diisopropoxyterephthaloyl chloride and 1,4-butanediol.

3：List of Experimental Equipment and Materials:

Equipment included a Shimadzu UV-2550 spectrometer for absorption spectra, a Hamamatsu Photonics C9920-02 system for luminescence measurements, NMR spectrometers (Varian Mercury 400, Bruker Avance II 300), IR spectrometers (Shimadzu FTIR-8400), mass spectrometer (JEOL JMS-700), and thermal analysis instruments (Seiko Instrument Inc. TG/DTA6200). Materials included chemicals like dimethyl 2,5-dihydroxyterephthalate, alkyl halides, phenols, solvents (toluene, CH2Cl2, THF), and polymers (PMMA).

4：0). Materials included chemicals like dimethyl 2,5-dihydroxyterephthalate, alkyl halides, phenols, solvents (toluene, CH2Cl2, THF), and polymers (PMMA). Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: Synthesis involved refluxing reactions, purification by column chromatography and recrystallization. Photophysical measurements were done in solution, PMMA films, and powder states. Polymer films were prepared by spin-coating. Doping experiments were conducted to achieve white emission.

5：Data Analysis Methods:

Data were analyzed using DFT calculations (Gaussian 09), statistical analysis of quantum yields, and spectral interpretation.