ABSTRACT Chiral Pd(II) complexes bearing trans ‐bis(2‐aminotroponato) and trans ‐bis(salicylaldiminato) ligands were synthesized, and their chiroptical properties were systematically compared. Single‐crystal x‐ray diffraction revealed that the trans ‐bis(2‐aminotroponato) complex adopted a twisted structure, whereas the trans ‐bis(salicylaldiminato) complex exhibited a distinct bowl‐shaped structure. These structural differences were directly reflected in the circular dichroism (CD) responses. The twisted trans ‐bis(2‐aminotroponato) complex showed a modest chiroptical activity with a g abs value of approximately 1 × 10 −4 , whereas the bowl‐shaped trans ‐bis(salicylaldiminato) complex displays a five‐fold enhanced CD response ( g abs = 5 × 10 −4 ). Density functional theory (DFT) calculations support the experimentally observed geometries and provide insights into the origin of the contrasting chiroptical behavior. This study highlights the critical role of ligand frameworks in controlling the molecular geometry and chiroptical properties of square–planar transition metal complexes.
Ikeshita et al. (Sun,) studied this question.
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