|
Metal-organic framework material (MOF) is the rise of a new field of research over the past decade, due to its rich structure and the gas storage, catalysis, bio-medicine and other aspects potentially important application value has been widely studied. Wherein the magnesium-based metal organic framework compounds due to the low density can improve the quality of the material density hydrogen storage, gas storage material is expected to be excellent. In this paper, solvothermal method and ion thermal method has been a series of magnesium-based metal organic framework compounds were: [NH 2 (CH 3 ) 2 < / sub>] [Mg 3 (NDC) 2.5 (CHO 2 ) 2 (DMF)] · DMF · 0.25H 2 O (1), [Mg 3 (OH) 2 (NDC) 2 (4 , 4'-bpy) (H 2 O)] · 0 .5 H 2 O ( 2 ), [Mg 3 (OH) 2 (NDC) 2 (4,4 '-bpy) 0.5 (H 2 O) 0.5 (CH 3 OH) 0.5 ] · 0.5H 2 O ( 3 ), [Mg 3 (OH) 2 (NDC) 2 (dppe) (H < sub> 2 O)] (4), [Mg 5 (OH) 2 (PMC) 2 (H 2 O) 4 ] · 14.5H 2 O (5), Na 2 Mg (PMC) (H 2 O) 2 (6), Mg 2 (PMC) (H 2 O) 4 (7), Na 2 Mg (H 2 PMC) (H 2 O) 10 (8), Mg 2 (PMC) (H 2 O) 10 · 6H 2 O (9), [NH 2 (CH 3 ) 2 ] [N (CH 3 ) 4 ] [Mg5 (bpdc) < sub> 3 (O 2 CH) 6 ] · 3 H 2 O (10) , [Bmim] [Mg 3 (NDC) 2.5 (NDCH) (CHO 2 )] (11), [Amim] 2 [Mg 3 (1,4-NDC) 4 (MeIm) 2 (H 2 O) 2 ] · 2 H 2 O (1 2 ), [Mg 3 < / sub> (bpdc) 3 (1-MeIm) 4 ] (13), [Bmmim] [Mg 3 (4,4 ' -oba) 3 (4,4 '-obaH)] (14). This paper reports the synthesis, structure and characterization. Solvothermal synthesis of compounds 1-10: Compounds 1-4 are used 1,4 - naphthalene carboxylic acid as bridging ligands constructed of magnesium based metal organic framework compounds, through the introduction of the second ligand 4,4 '- bipyridine, 1, 3 - bis (4 - pyridyl) propane as a bridging ligand or terminal ligands, expanding rich structure of the compound. Fluorescence analysis showed that compound 1, 2 , 4 are expressed as a ligand luminescence; compound 5-9 is the use of pyromellitic acid as bridging ligand, by adjusting the pH of the reaction system obtained five compounds, pyromellitic acid or partially deprotonated magnesium deprotonated ligand, resulting from a zero-dimensional to three-dimensional structure. Compounds 6 and 8 for the sodium-magnesium-based metal organic framework compounds. Compound 10 is 4,4 '- biphenyl dicarboxylic acid as an example of the organic ligand to build three-dimensional structure of the magnesium-based metal organic framework compounds, with 8.21? Cavity, calculated by PLATON own after removal of guest molecules porosity was 31%. Compounds 11-14 are synthesized by ion thermal magnesium based metal organic framework material: Compound 11 is an example in which three-dimensional structure of the cationic framework has six core building blocks of magnesium secondary cluster, remove methyl imidazole ligands, solvent water molecules and After the ionic liquid was 26% porosity; Compound 12 and 13 are two cases of ionic liquid cation containing three-dimensional structure during the synthesis 1 - allyl-3 - methylimidazolium interesting place in situ decomposition to produce the methyl imidazole ligand in a terminal group of the magnesium complex; Compound 14 is a flexible ligand 4,4 '- diphenyl ether dicarboxylic acid and magnesium nitrate to build a three-dimensional structure, thermogravimetric analysis indicates that the compound has a high thermal stability.
|