Bismuth-based catalysts have gained attention for their low toxicity and remarkable catalytic activity in the production of biodegradable polyesters. This study introduces, for the first time, the synthesis and thorough characterization of tri (phenylethynyl) bismuth (BiAK), achieved through H and C NMR and FTIR spectroscopic analysis. Subsequently, BiAK was employed in the ring-opening polymerization (ROP) of -lactide (-LA). Notably, the addition of alcohol as a co-catalyst facilitated polymerization via a coordination-insertion mechanism, yielding partially isotactic-enriched poly (lactide) (PLA) with a tacticity index of up to 0.67. The kinetic profile of this polymerization was explored through various experimental conditions, highlighting not only the catalyst's performance but also its remarkable control over the polymerization process. Significantly, a linear relationship between molecular weight () and LA conversion was observed, accompanied by narrow molecular weight distributions (). Therefore, our findings highlight the potential of BiAK as a bismuth-based pre-catalyst for the control synthesis of biodegradable polyesters, shedding light on its catalytic efficacy and precision in controlling the polymerization.

中文翻译：

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三(苯乙炔基)铋：一种有前景的低毒预催化剂，用于外消旋丙交酯的立体选择性开环聚合


铋基催化剂因其低毒性和在生物可降解聚酯生产中显着的催化活性而受到关注。本研究首次介绍了通过 1H 和 13C NMR 以及 FTIR 光谱分析实现的三（苯乙炔基）铋 (BiAK) 的合成和彻底表征。随后，BiAK被用于β-丙交酯(-LA)的开环聚合(ROP)。值得注意的是，添加醇作为助催化剂通过配位插入机制促进聚合，产生立构规整指数高达0.67的部分全同立构富集的聚丙交酯(PLA)。通过各种实验条件探索了这种聚合的动力学曲线，不仅突出了催化剂的性能，而且突出了它对聚合过程的显着控制。值得注意的是，观察到分子量 () 和 LA 转化率之间存在线性关系，并伴有窄分子量分布 ()。因此，我们的研究结果凸显了 BiAK 作为铋基预催化剂用于生物可降解聚酯控制合成的潜力，揭示了其催化功效和控制聚合的精确度。