618-88-2Relevant articles and documents
5-Nitroisophthalic acid hydrate
Mahapatra, Ajit Kumar,Adak, Avijit,Goswami, Shyamaprosad,Nigam, Gur Dayal,Chinnakali, Kandasamy,Shanmuga Sundara Raj,Razak, Ibrahim Abdul,Fun, Hoong-Kun
, p. 1845 - 1847 (1999)
In the title compound, C8H5NO6·H2O, the carboxylic acid groups are coplanar with the phenyl ring, whereas the nitro group is twisted from it by 26.1 (3)°. In the crystal, the molecules are linked by O - H...O hydrogen bonds through the water molecules and by weak C -H...O hydrogen bonds involving the nitro groups, to form infinite zigzag sheets.
Synthesizing method of 5-nitroisophthalic acid
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Paragraph 0025; 0027; 0029; 0031; 0033; 0034; 0035; 0036, (2018/04/03)
The invention discloses a synthesizing method of 5-nitroisophthalic acid. The synthesizing method comprises the following steps of reacting, washing by water, filtering, recrystallizing and purifying.The synthesizing method has the advantages that by using isophthalic acid as a raw material, a small amount of concentrated sulfuric acid and 60% of nitric acid are used for reacting and nitrifying,so as to synthesize the 5-nitroisophthalic acid; the usage amounts of sulfuric acid and nitric acid are reduced, the effective utilization rate of equipment is improved, the generation of waste liquidin production is reduced, the difficulty in treatment of the waste liquid is decreased, the problem of nitrifying difficulty is solved, and the economic benefit and environment-friendly social benefit of the product are improved.
Liquid-Crystalline Star-Shaped Supergelator Exhibiting Aggregation-Induced Blue Light Emission
Pathak, Suraj Kumar,Pradhan, Balaram,Gupta, Monika,Pal, Santanu Kumar,Sudhakar, Achalkumar Ammathnadu
, p. 9301 - 9312 (2016/10/06)
A family of closely related star-shaped stilbene-based molecules containing an amide linkage are synthesized, and their self-assembly in liquid-crystalline and gel states was investigated. The number and position of the peripheral alkyl tails were systematically varied to understand the structure-property relation. Interestingly, one of the molecules with seven peripheral chains was bimesomorphic, exhibiting columnar hexagonal and columnar rectangular phases, whereas the rest of them stabilized the room-temperature columnar hexagonal phase. The self-assembly of these molecules in liquid-crystalline and organogel states is extremely sensitive to the position and number of alkoxy tails in the periphery. Two of the compounds with six and seven peripheral tails exhibited supergelation behavior in long-chain hydrocarbon solvents. One of these compounds with seven alkyl chains was investigated further, and it has shown higher stability and moldability in the gel state. The xerogel of the same compound was characterized with the help of extensive microscopic and X-ray diffraction studies. The nanofibers in the xerogel are found to consist of molecules arranged in a lamellar fashion. Furthermore, this compound shows very weak emission in solution but an aggregation-induced emission property in the gel state. Considering the dearth of solid-state blue-light-emitting organic materials, this molecular design is promising where the self-assembly and emission in the aggregated state can be preserved. The nonsymmetric design lowers the phase-transition temperatures.The presence of an amide bond helps to stabilize columnar packing over a long range because of its polarity and intermolecular hydrogen bonding in addition to promoting organogelation.