Controllable strategies for the design of molecular ferroelectrics have been actively pursued in recent years due to their promising applications in modern electronic devices. In this work, we present a spiro-driven approach for the design of a new class of molecular ferroelectrics. Using 2-morpholinoethanol (MEO) as a bidentate chelating ligand and the SCN- anion as a bridging co-ligand, we obtained a neutral chain-like ferroelectric coordination polymer, [Cd(MEO)(SCN)2]. Interestingly, it undergoes both a thermal-induced phase transition, driven by ring-conformational flipping of the spiro-like [Cd(MEO)] fragment, and a pressure-induced transition, triggered by significant deformation of the spring-like [Cd(SCN)2]∞ helical chain. Unlike most previously reported ferroelectric coordination polymers, which often rely on organic cationic guests, this work introduces a new avenue for designing neutral ferroelectric coordination polymers. Overall, the spiro-driven strategy provides valuable insights and a novel structural motif for the development of advanced molecular ferroelectrics.
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