Abstract
Employing a flexible phosphoramide ligand L, PhPO(NH3Py)2 (3Py = 3-pyridyl), four new Cu(II) cationic coordination assemblies 1, 1a, 2, and 3 of composition {[Cu2L4(H2O)2]·(ClO4)4·(H2O)5·(CH3OH)}∞, {[Cu3L6(H2O)3]·(ClO4)5·(NO3)·(H2O)11}∞, {[Cu4L8(H2O)5]·(NO3)8·L·(H2O)9}, and {[Cu3L6]·(NO3)6·(H2O)8·(CH3OH)2}, respectively, were synthesized. The compounds 1 and 1a having perchlorate and mixed perchlorate-nitrate anions, respectively, were obtained as noncentrosymmetric 1D-helical assemblies. However, 2 and 3 were obtained as discrete centrosymmetric assemblies of composition M4L8 and M3L6, respectively. Interestingly, 2 can encapsulate the hydrated potassium cation [K(H2O)8]+ in its intrinsic cavity. The ferroelectric measurements of 1 and 1a gave a well saturated ferroelectric hysteresis loop giving saturation polarization (Ps) values of 1.8 and 0.55 μC/cm2, respectively. This indicates that the presence of nitrate anion in the packing structure has an effect in altering the asymmetry of the system, which c...
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