Homochiral laminar europium metal-organic framework with unprecedented giant dielectric anisotropy

Hydrothermal (deuterato-thermal) reaction Of L-ethyl lactate (Lig-Et) with Eu(ClO4)(3)center dot 6H(2)O gives colorless block crystals of [Eu(Lig)(2)(X2O)(2)][ClO4] (1, X=H; 2, X=D) both of which possess a two-dimensional laminar homochiral framework. Single-crystal dielectric measurements reveal that 1 and 2 display a giant dielectric anisotropy approximately exceeding 100 and large isotopic effect with about 54% enhancement along the a axis. Their ferroelectric features further confirm this respect. Crystal parameters: 1, C6H14ClO12Eu, M-r= 465.58, monoclinic, C-2, a=8.6786(6), b = 8.3965(6), c = 10.2153(7) angstrom, beta = 92.040(1)degrees, V=743.92(9) angstrom(3), Z=2, rho(calcd) = 2.079 Mg m(-3), R, = 0.0508, wR(2) = 0.1239, mu = 4.448 mm(-1), S = 1.043; Flack=0.04(5). 2: C6H10D4ClO12Eu, M-r=469.61, monoclinic, C-2, a = 8.689(2), b = 8.410(2), c = 10.224(3)A, beta = 92.057(4)degrees, V = 746.7(3) angstrom(3), Z=2, rho(calcd) = 2.089 Mg m(-3), R-1=0.0465, wR(2)=0.1150, mu = 4.432 mm(-1), S = 1.058; Flack = 0.02(5).