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Design, Synthesis and Property Studies of Azolylbenzoic Acid Organotin Complexse

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Tutor: ZhouHongPing
School: Anhui University
Course: Inorganic Chemistry
Keywords: Organotin complexes,Crystal structure,Optical Properties,Biological activity
CLC: O627.42
Type: Master's thesis
Year:  2011
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Abstract:
Supramolecular Crystal Engineering is today the most active research directions in the field of coordination chemistry, because the supramolecular topology not only has rich and varied, and have potential applications in the optical, electrical, magnetic, and catalytic. Is well known, the geometry and other factors provided by the number of coordination sites and ligand used in the types of ions, and the reaction type, ligand complexes will jointly affect the final morphology. Wherein the organic ligand is an important part of the complex, to select a different ligand, will not only directly affect the assembled complexes entity, but also affects the formation of the weak interaction of the complexes build a supramolecular structure, such as hydrogen bonding, ¦Ğ ... ¦Ğ stacking interactions, the role of the metal to metal, metal and nonmetal role. Further, the nature of the complexes in a certain extent depending on the nature of the ligand itself. Therefore the choice of the ligand has a very important significance for research and development of the complexes having a novel structure and excellent performance. The five-membered nitrogen ring introduced into the benzoic acid, the design and synthesis of the four kinds of the compound having a nitrogen ligand at the same time point and an oxygen coordination sites, and these ligands are reacted with an organic tin compound, the series having a specific structure and Properties of the organic tin complexes. The main contents of this paper are as follows: on the basis of the research literature on the research progress of azoles, carboxylic acids and organic tin complexes are reviewed and design ideas proposed in this paper. 2 Synthesis of the four structurally similar azole acid ligands, i.e., 4 - imidazol-benzoic acid (the HL1), 4 - pyrazol-benzoic acid (HL2), 4 - triazol-benzoic acid (HL3) and 4 - tetrazole benzoic acid (HL4). The structure of these ligands was confirmed by nuclear magnetic resonance spectroscopy, infrared spectroscopy, mass spectrometry, elemental analysis and characterization methods. HL1 crystal and HL1 hydrochloride crystals by single crystal X-ray diffraction techniques were tested. The analysis showed the presence of multiple hydrogen bonds: in HL1 hydrochloride crystals. These hydrogen bonds formed by water molecules and free chlorine atoms, three-dimensional topology build the HL1 hydrochloride crystals, plays an important role. HL1 the crystal in the absence of solvent molecules, the kind of the formation of hydrogen bonds is relatively small, the three-dimensional structure is also relatively simple. 3 respectively HL1-HL4 triphenyl tin hydroxide and dibutyl tin oxide was obtained by the reaction of a novel structure of the organic tin complexes 1-8. Tin spectrum, infrared spectroscopy and elemental analysis of the structure of these complexes. Six of them obtained by single crystal X-ray diffraction technique on single crystal complexes 1-6, the analytical results showed that: 1 is a one-dimensional linear polymer, 2 and 4 having a similar structure of single molecular complexes, 3 is a single molecule with a methanol solvent molecule complexes, 5 and 6 are the complexes having similar ladder structure. Although the ligand is very similar, except that the position and number of the nitrogen atom in the five-membered nitrogen ring occurred changes, results not only with the physical structure of the object changes, and the weak force, such as hydrogen bonding, ¦Ğ ... ¦Ğ stacking interaction, there are also the changes, and ultimately lead to different supramolecular structure. The optical properties of the ligand and its complexes, solid fluorescence: The results show that the emission peak of the complex for which the corresponding ligand occurs with varying degrees of red shift or blue shift, which may be due to the central metal is different coordination environments as well as solid accumulation intermolecular there are different results of the coordinating role of the weak force. Ligand complexes antibacterial anticancer research, a preliminary discussion of the structure-activity relationship between them. The results show that: the biological activity of the complexes was significantly better than the corresponding ligand has potential applications in biological aspects.
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