933-20-0Relevant articles and documents
Growth mechanisms of 2D organic assemblies generated from dialkylated melaminium derivatives: The length difference of the two alkyl chains that matters
Xu, Jun,Wu, Guanglu,Wang, Zhiqiang,Zhang, Xi
, p. 10959 - 10963 (2013)
This research is aimed to understand the growth mechanisms for self-assembly of dialkylated melamine derivatives. The dialkylated melamine derivatives with different alkyl chains (Mela-m-n) are able to self-assemble with hydrochloric acid in dichloromethane to form 2D organic assemblies, exhibiting similar lamellar structures as Mela-n·HCl with identical alkyl chains. The most interesting finding is that the growth mechanism of Mela-n·HCl with identical alkyl chains is revealed to be layer growth, while Mela-m-n·HCl with asymmetric alkyl chains adopts a spiral growth mechanism. The asymmetric alkyl chains in Mela-m-n may lead to the formation of dislocation, which is responsible for the spiral growth mechanism.
Nitrogen-rich salts based on energetic nitroaminodiazido[1,3,5]triazine and Guanazine
Huang, Yangen,Zhang, Yanqiang,Shreeve, Jean'Ne M.
, p. 1538 - 1546 (2011)
Highly dense nitrogen-rich ionic compounds are potential high-performance energetic materials for use in military and industrial venues. Guanazinium salts with promising energetic anions and a family of energetic salts based on nitrogen-rich cations and the 6-nitroamino-2,4-diazido[1,3,5]triazine anion (NADAT) were prepared and fully characterized by elemental analysis, IR spectroscopy, 1Ha NMR and 13Ca NMR spectroscopy, and differential scanning calorimetry (DSC). The crystal structures of neutral NADAT (2) and its biguanidinium salt 5 were determined by single-crystal X-ray diffraction (2: orthorhombic, Pnma; 5: monoclinic, P21). Additionally, the isomerization behavior of 2 in solution was investigated by proton-decoupled 13C and 15N NMR spectroscopy. All the new salts exhibit desirable physical properties, such as relatively high densities (1.63-1.78a ga cm-3) and moderate thermal stabilities (Td = 130-196°C for 3-10 and 209-257°C for 11-15). Theoretical performance calculations (Gaussiana 03 and Cheetaha 5.0) gave detonation pressures and velocities for the ionic compounds 3-15 in the range of 21.0-30.3a GPa and 7675-9048a ma s-1, respectively, which makes them competitive energetic materials. Bang boom bang: Nitrogen-rich salts based on nitroamino-diazido-s-triazine and guanazine exhibit high density, good thermal stabilities, and positive calculated heats of formation (see scheme). Predicted detonation pressures (21.0-30.3a GPa) and detonation velocities (7675-9048a ma s-1) suggest that these salts have potential as insensitive energetic materials.
A PROCESS FOR THE PREPARATION OF UV ABSORBERS
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Page/Page column 71-72, (2020/07/25)
The presently claimed invention relates to a novel, highly efficient and general process for the preparation of UV absorbers.
Design and development of 1,3,5-triazine-thiadiazole hybrids as potent adenosine A2A receptor (A2AR) antagonist for benefit in Parkinson's disease
Agnihotri, Amol Kumar,Bhat, Hans Raj,Giri, Sabeena,Masih, Anup,Pandey, Nidhi,Shrivastava, Jitendra Kumar,Singh, Saumya,Singh, Udaya Pratap
, (2020/07/08)
Various studies showed adenosine A2A receptors (A2ARs) antagonists have profound therapeutic efficacy in Parkinsons Disease (PD) by improving dopamine transmission, thus being active in reversing motor deficits and extrapyramidal symptoms related to the disease. Therefore, in the presents study, we have showed the development of novel 1,3,5-triazine-thiadiazole derivative as potent A2ARs antagonist. In the radioligand binding assay, these molecules showed excellent binding affinity with A2AR compared to A1R, with significant selectivity. Results suggest, compound 7e as most potent antagonist of A2AR among the tested series. In docking analysis with A2AR protein model, compound 7e found to be deeply buried into the cavity of receptor lined via making numerous interatomic contacts with His264, Tyr271, His278, Glu169, Ala63, Val84, Ile274, Met270, Phe169. Collectively, our study demonstrated 1,3,5-triazine-thiadiazole hybrid as a highly effective scaffold for the design of new A2A antagonists.
The surprising pairing of 2-aminoimidazo[1,2-a][1,3,5]triazin-4-one, a component of an expanded DNA alphabet
Laos, Roberto,Lampropoulos, Christos,Benner, Steven A.
, p. 22 - 28 (2018/12/13)
Synthetic biologists demonstrate their command over natural biology by reproducing the behaviors of natural living systems on synthetic biomolecular platforms. For nucleic acids, this is being done stepwise, first by adding replicable nucleotides to DNA, and then removing its standard nucleotides. This challenge has been met in vitro with `six-letter' DNA and RNA, where the Watson–Crick pairing `concept' is recruited to increase the number of independently replicable nucleotides from four to six. The two nucleobases most successfully added so far are Z and P, which present a donor–donor–acceptor and an acceptor–acceptor–donor pattern, respectively. This pair of nucleobases are part of an `artificially expanded genetic information system' (AEGIS). The Z nucleobase has been already crystallized, characterized, and published in this journal [Matsuura et al. (2016). Acta Cryst. C72, 952–959]. More recently, variants of Taq polymerase have been crystallized with the pair P:Z trapped in the active site. Here we report the crystal structure of the nucleobase 2-aminoimidazo[1,2-a][1,3,5]triazin-4-one (trivially named P) as the monohydrate, C5H5N5O·H2O. The nucleobase P was crystallized from water and characterized by X-ray diffraction. Interestingly, the crystal structure shows two tautomers of P packed in a Watson–Crick fashion that cocrystallized in a 1:1 ratio.
