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

Homochiral laminar europium metal-organic framework with unprecedented giant dielectric anisotropy.
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DOI:
10.1002/chem.200701449
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发表时间:
2008-04
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通讯作者:
Zhirong Qu;Qiong Ye;Hong Zhao;D. Fu;Heng‐Yun Ye;R. Xiong;T. Akutagawa;Takayoshi Nakamura
Zhirong Qu;Qiong Ye;Hong Zhao;D. Fu;Heng‐Yun Ye;R. Xiong;T. Akutagawa;Takayoshi Nakamura
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文献类型:
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作者:
Zhirong Qu;Qiong Ye;Hong Zhao;D. Fu;Heng‐Yun Ye;R. Xiong;T. Akutagawa;Takayoshi Nakamura

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L-乳酸乙酯(Lig-Et)与Eu(ClO(4))(3)6 H(2)O的水热(氘代)反应得到了无色的块状晶体[Eu(Lig)(2)(X(2)O)(2)][ClO(4)](1,X=H; 2,X=D),两者都具有二维层状纯手性骨架.单晶介电测量表明,1和2显示出约超过100的巨大介电各向异性和大的同位素效应,沿a轴沿着增强约54%。它们的铁电特性进一步证实了这一点。晶体参数:1,C(6)H(14)ClO(12)Eu,M(r)=465.58,单斜晶系,C(2),a=8.6786(6),B=8.3965(6),c=10.2153(7)A,β =92.040(1)度,V=743.92(9)A(3),Z=2,rho(calcd)=2.079 Mg m(-3),R(1)=0.0508,wR(2)=0.1239,mu=4.448 mm(-1),S=1.043,Flack=0.04(5).第二章:C(6)H(10)D(4)ClO(12)Eu,M(r)=469.61,单斜晶系,C(2),a=8.689(2),B=8.410(2),c=10.224(3)A,β =92.057(4)度,V=746.7(3)A(3),Z=2,rho(计算值)=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).
Hydrothermal (deuteratothermal) reaction of L-ethyl lactate (Lig-Et) with Eu(ClO(4))(3)6 H(2)O gives colorless block crystals of [Eu(Lig)(2)(X(2)O)(2)][ClO(4)] (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, C(6)H(14)ClO(12)Eu, M(r)=465.58, monoclinic, C(2), a=8.6786(6), b=8.3965(6), c=10.2153(7) A, beta=92.040(1) degrees , V=743.92(9) A(3), Z=2, rho(calcd)=2.079 Mg m(-3), R(1)=0.0508, wR(2)=0.1239, mu=4.448 mm(-1), S=1.043; Flack=0.04(5). 2: C(6)H(10)D(4)ClO(12)Eu, 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) A(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).