Synthesis And Structures Of The Layered Perovskite-type Organic-inorganic Hybrids (C_nH_2n+1NH₃)₂MCl₄

The perovskite-type structure is one of the most important parent structures of functional materials. This is not only because of the numerical superiority of the new functional materials with this structure but also because of the self-harmonic variation of the structure distortions. The 3-dimensional perovskite structure can be cut into low-dimensional structural units and be assembled according to the specific property requirements of the materials in kinds of devices. Layered perovskite-type organic-inorganic hybrids are sort of the assembly of the organic and inorganic units by employing the soft chemistry methods. In the assembly, the organic and the inorganic units were hybridized on the molecular scale and formed the layered perovskite structure. In the microelectronics field, the potential application of the hybrids is in good prospect for their novel properties.The layered perovskite-type hybrids give the possibilities of combining the useful properties of the organic and inorganic compounds. Moreover, they provide a new substantial opportunity for deeply understand the laws of the structure forming and the relationship of the structures and properties. The properties of materials strongly depend on their structures. In order to get the principles and to get to the realization of the structure and property design or control, it is quite necessary to systematically study the layered perovskite hybrids on the structures and the structure forming and it is very significant both in the theories and in the realities.This dissertation focuses on the synthesis and the structures of the organic-inorganic hybrids with chemical formula (C_nH_2n+1NH₃)₂MCl₄ and the expected layered perovskite-type structure, where M=Mn,Fe,Co,Ni,Cu,Zn and n=2,4,6,8,10,12. The 5 series hybrids, 30 compounds of M= Mn,Fe,Co,Cu,Zn were successfully synthesized by the reactions in solutions and the optimum synthetic conditions were found out.The structures of the 5 series hybrids at room temperature and the interactions between the different components in the hybrids were characterized and analyzed by XRD, SEM, FTIR and TG-DSC. The results demonstrate that all hybrids feature layered structures and the interlayer distance increases depend linearly on the increasing of the organic alkyl chain lengths. The results also suggest that the structures of the hybrids are very similar inside the group of M=Mn,Fe,Cu and inside the group of M=Co,Zn, respectively. But they are different between the two groups. The structure similarity inside the groups and the difference between the groups are...