Rational Design of Non-Centrosymmetric Lanthanide Complexes for Enhanced Spin–Electric Coupling (SEC)

In this work, we report the optimized synthesis, crystal structure, and magnetic properties of a new isostructural series of non-centrosymmetric lanthanide complexes, [LnCl₃L₃] (Ln = Dy, Er, Y) and L = 2,2,2-trichloro-N-(dipiperidinophosphoryl)acetoamide). By controlling water competition, steric effects, and solvation, we obtained stable crystalline compounds featuring trigonal symmetry (R3), an idealized trigonal antiprismatic coordination environment, and an intrinsic electric dipole moment. These compounds was designed as promising molecular platforms for investigating the Spin–Electric Effect (SEE).