In the interaction of the heterometallic complex [Li2Zn2(py)2(piv)6] (piv– is the pivalate anion, py is pyridine) with 2,5-dibromoterephthalic acid (H2Br2-bdc) or 9,10-anthracenedicarboxylic acid (H2adc), two coordination polymers [Li(DMF)(HBr2-bdc)] (1) and (Me2NH2)[Zn(Hadc) (adc)]·DMF·H2O (2) are obtained. During the synthesis, the initial tetranuclear heterometallic fragment is completely fragmentated. When the same complex interacts with nitroterephthalic acid (H2NO2-bdc), a heterometallic metal-organic framework (Me2NH2)[LiZn(NO2- bdc)2]·DMF (3) is formed. Resulting coordination polymer 3 has a three-dimensional porous structure; binuclear heterometallic carboxylate moieties {LiZn(COO)3} act as secondary building blocks.

中文翻译：

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从异金属三价络合物 [Li2Zn2(py)2(piv)6] 获得的金属-有机框架的晶体结构

在异金属配合物 [Li2Zn2(py)2(piv)6]（piv– 是新戊酸阴离子，py 是吡啶）与 2,5-二溴对苯二甲酸 (H2Br2-bdc) 或 9,10-蒽二羧酸（ H2adc)，得到两种配位聚合物[Li(DMF)(HBr2-bdc)](1)和(Me2NH2)[Zn(Hadc)(adc)]·DMF·H2O(2)。在合成过程中，最初的四核异金属碎片被完全裂解。当相同的配合物与硝基对苯二甲酸 (H2NO2-bdc) 相互作用时，形成异金属金属有机骨架 (Me2NH2)[LiZn(NO2-bdc)2]·DMF (3)。得到的配位聚合物3具有三维多孔结构；双核异金属羧酸盐部分 {LiZn(COO)3} 作为二级结构单元。