# Synthesis, Properties and Application of Novel 2-Substituted Benzothiazole-Based Oxime Esters

## TL;DR

This paper introduces new benzothiazole-based oxime esters with promising properties for use in light-induced polymerization processes.

## Contribution

The study presents a novel synthesis method and evaluates the spectroscopic and electrochemical properties of new oxime esters.

## Key findings

- Six benzothiazole-based oxime esters were successfully synthesized and characterized using NMR, FT-IR, and elemental analysis.
- The compounds showed potential as Type I photoinitiators for free radical polymerization based on their fluorescence and electrochemical properties.
- The E0→0 transition energy and fluorescence quantum yield were measured, supporting their utility in light-induced processes.

## Abstract

The paper focuses on the synthesis and characterization of the spectroscopic and electrochemical properties of novel oxime esters. Six benzothiazole-based compounds were synthesized using a simple three-step procedure. The chemical structure of novel oxime esters was confirmed by Nuclear Magnetic Resonance spectroscopy (1H and 13C NMR), as well as FT-IR spectroscopy and elemental analysis. The melting point of these compounds was also determined. The spectroscopic properties were studied in 10 solvents with different polarity. The fluorescence quantum yield was determined using Coumarin I as a reference. Additionally, the E0→0 transition energy was determined. The electrochemical properties were determined using cyclic voltammetry. To justify their use as potential photoinitiators, preliminary studies were conducted to assess their utility in initiating light-induced polymerization. Based on the results, the proposed oxime esters are potential Type I photoinitiators for free radical polymerization.