Construction And Properties Of Metal Iodates Based On Bis(tri)imidazole

Inorganic-organic hybrid materials have been extensively studied in recent decades due to their structural diversity and unique properties conferred by inorganic and organic components,as well as their potential applications arising from their interactions.Metal-halogen(pseudohalogen)compounds are an important class of hybrid functional materials,especially hybrid iodates due to their tunable structures,the strong affinity of metals for iodide anions,and their various properties such as photoluminescence,photo/thermochromic,phosphorescence,white light and photocatalysis,etc)have received special attention.In order to obtain more hybrid metal iodates with novel structures and excellent properties,in this paper,we selected different bis(tri)azole organic ligands with Ag(?),Pb(?),Cu(?).Nine examples of hybrid metal iodates were constructed by hydrothermal(solvothermal)method,and their single crystal structures and properties were investigated.Thesis is divided into five chapters:The first chapter is the introduction,which mainly introduces the concept,development,classification and research progress of inorganic-organic hybrid materials and potential applications in various fields.The purpose of the topic selection,main research contents and research results of this thesis are introduced.The second chapter for experiments,reagents and instruments.The third chapter utilizes two azole molecules,dtb=1,4-bis(1H-1,2,4-triazol-1-yl)benzeneandmimb=1,2-bis((2-methyl-1H-imidazole-1-yl)methy)benzene).Two examples of silver iodate compounds[pbmt]_0.5[AgI₂]1 and[H₂(mimb)]_0.5[Ag₂I₃]2 were synthesized from imidazol-1-yl)methyl)benzene and AgI under solvothermal conditions.The[pbmt]²⁺in 1 is obtained by in situ N-alkylation of dtb with methanol.1 is a 1-D chain structure,while 2 is a special three-dimensional open frame structure.Photoluminescence analysis showed that 1 emits yellow light at room temperature,and yellow and yellow-green light at different excitation wavelengths at low temperature,1 has fluorescent photo(thermo)chromic properties,while 2 does not have these properties.The fourth chapter selects 4 azole molecules(mimb=1,2-bis((2-methyl-1H-imidazol-1-yl)methyl)benzene,1,3-bimb=1,3-bis((2-methyl-1H-imidazol-1-yl)methyl)benzene,1,2-bimb=1,2-bis((1H--imidazol-1-yl)methyl)benzene,dtb=1,4-Bis(1H-1,2,4-triazol-1-yl)benzene),solvothermally reacted with PbI₂ and HI in different alcoholic solvents to form 4 new hybrid lead iodide compounds[H₂(mimb)][Pb₂I₆]3,[pmbmi][Pb₂I₆]4,[N,N-pmbmi][Pb₂I₆]5,[pbmt][Pb₂I₆]6.The[pmbmi]²⁺,[N,N-pmbmi]²⁺and[pbmt]²⁺in compounds 4-6 were obtained by in situ N-alkylation of organic bases with methanol.Optical properties show that 3-5 emit yellow or red light at low temperature and no light at room temperature.And through the exploration of photocatalytic performance,it was found that 3 has excellent photocatalytic performance.The fifth chapter utilizes two organic ligands(dtb=1,4-bis(1H-1,2,4-triazol-1-yl)benzene,dip=3,5-bis(1H-imidazol-1-yl)pyridine Three examples of copper iodate compounds with different structures[pbmt]_0.5[Cu I₂]7,[peti][Cu I₂]I.H₂O 8,[dip(Cu₃I₃)]9.Among them,[pbmt]²⁺is obtained by in situ N-methylation of dtb and methanol,and[peti]²⁺is obtained by in situ N-ethylation of dtb and methanol.The luminescence properties show that 9 emits orange light at room temperature and red light at low temperature,that is,9 has fluorescence thermochromic properties.