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Synthesis, Crystal Structures and Properties of the Crystalline

Author: ZhangPeng
Tutor: LiDongSheng
School: Yan'an University
Course: Analytical Chemistry
Keywords: Metal–Organic Frameworks (MOFs) Characterization Structrue Topology Fluorescent activity Magnetic properties
CLC: O641.4
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract


With the promoting intersection and merging of analytical chemistry with subdiscipline of Chemistry, materials science, biological science and energy and environmental science, available modern testing means particularly important to the analysis of functional materials. In this respect, one of current hot spots is Metal–Organic Frameworks （MOFs）. It offers a unique platform for the development of solidstate materials as they have a degree of structural predicatability and the possibility of permanent porosity, which leads to features not observed for traditional inorganic or organic complexes.How to explore the intermolemolecular interactions and its nature at the molecular level, further achieve controllable probing into the relationship between the structure and functions and ultimately realize the“design”synthesis and industrial applications. In this contribution, firstly, aborative design and select the organic tectons, and mainly investigate the regularity of assembly and mechanism of the coordination materials, synthesize 12 MOFs. The study on synthetic conditions and rules for these novels MOFs, topological analyses, and the exploration of relationships between structures and properties for these new compounds are also carried out.Twelve new MOFs have been synthesized on the basis of hydrothermal technique and solvent synthesis methods, and these materials were characterized through X-ray single crystal diffraction analysis, elemental analysis, fourier transform infrared spectra technology, thermal analysis technology. The Furthermore, we focus on the analysis and study of structural features、thermal stabilities、magnetic properties and fluorescent activity of aforementioned materials also have been studied.1. Introducing the principle of structural block-oriented, different metal ions as the center, 4 MOFs （1-4） were synthesized, including two 2-D layered structures and two 3-fold interpenetrated CdSO4 net.2. Three 3-D supramolecular lattices （5-7） with hetero-chiral helical chain have been solvothermally synthesized. Compound 5 presents 2-D network with （4·82） topology based on 4-connected nodes.3. Using the heterocyclic carboxylic acids as building blocks, 5 MOFs （8-12）were synthesized, and systemically investigated the assembly regularities of entanglement networks using in situ square-MBBs （molecular building blocks） as the molecular tectons. Compound 9 exhibits the twofold （2D→2D） entangled features with interlaced in a highly rare parallel fashion. Compound 10 represents a new 3,4-connected self-penetrating network topology, in which each 2-D sheet passes through an inclined one at angle of 78.94?. 8, 11 and 12 take different 1-D helical chains structure.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Structural Chemistry > Complex chemistry ( coordination chemistry )
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