Three new metal nitrates templated by 1,4-diazabicyclo[2.2.2]octane (DABCO) were successfully synthesized by slow evaporation method from aqueous solutions. Single crystals were characterized by X-ray diffraction technique which shows that all compounds crystallize in the monoclinic system, space group P2₁/c, with the following formula: (C₆H₁₄N₂)[M^II(H₂O)₆](NO₃)₄ with M^II: Mn (Z = 8), Ni and Zn (Z = 4). The crystal structures of the three materials can be described as mixed organic and inorganic free entities linked together via N–H⋯O and OW–H⋯O hydrogen bonds. Although the three compounds present the same formula and adopt the same crystal system and space group they show different atomic arrangement and two structure types are distinguished. Indeed, the arrangement of the different entities along cationic and anionic layers makes the structure of the manganese compound different with respect to the two others which are isostructural. The thermal decomposition of the precursors proceeds through several steps. The first one consists in the dehydration which takes place in two stages and leads to intermediate anhydrous phases while the second corresponds to the total degradation ending with the formation of the metal oxides M²⁺O.

中文翻译：

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以DABCO为模板的三种新型金属硝酸盐的光谱，结构和热性质：（C 6 H 14 N 2）[M II（H 2 O）6]（NO 3）4和M II：Mn，Ni和Zn

以慢速蒸发法从水溶液中成功合成了以1,4-二氮杂双环[2.2.2]辛烷为模板的三种新型金属硝酸盐。X射线衍射技术表征单晶，表明所有化合物均在单斜晶系空间群P2 ₁ / c中结晶，其分子式为：（C ₆ H ₁₄ N ₂）[M ^II（H ₂ O）₆ ]（NO ₃）₄与M ^II：Mn（Z ＝ 8），Ni和Zn（Z ＝ 4）。三种材料的晶体结构可描述为通过N–H⋯O和OW–H⋯O氢键连接在一起的有机和无机自由混合实体。尽管这三种化合物具有相同的分子式并采用相同的晶体系统和空间基团，但它们显示出不同的原子排列，并且区分了两种结构类型。实际上，沿阳离子层和阴离子层的不同实体的排列使得锰化合物的结构相对于同构的另外两个而言是不同的。前体的热分解通过几个步骤进行。²⁺ O。