DMF/H2O Volume Ratio Controls the Syntheses and Transformations of a Series of Cobalt Complexes Constructed Using a Rigid Angular Multitopic Ligand
摘要:
Through middle-temperature solvothermal reactions of CoCl2 center dot 6H(2)O with the rigid-angled ligand 3-(2'-pyridyl)-5(4 ''-pyridyl)-1,2,4-triazole (Hdpt24), we obtained the three cobalt complexes {[Co(dpt24)(2))](3)center dot 4DMF center dot 1.5H(2)O}(n) (1), {[Co(dpt24)(2))](2)center dot H2O}(n) (2), and Co(dpt24)(2)(Hdpt24)center dot H2O] (4) at N,N-dimethylformamide (DMF)/H2O volume ratios of 9:1, 1:1, and 0:1, respectively. Interestingly, 1 underwent transformations into 2, {[Co(dpt24)(2)]center dot 0.5DMF}(n) (3), and 4 when treated with DMF/H2O at volume ratios of 1:1, 1:9, and 0:1, respectively. Moreover, 3 and 4 converted back to 1 in 9:1 DMF/H2O and to 2 in 1:1 DMF/H2O; 3 transformed into 4 in H2O and vice versa in 1:9 DMF/H2O. Structurally, 1 is a three-dimensional (3D) 2-fold interpenetrating distorted NbO-type complex, 2 possesses a two-dimensional layer metal-organic framework, 3 is a 3D 2-fold interpenetrating typical NbO-type complex, and 4 is a wheel-shaped mononuclear neutral complex. This approach, using a mixed solvent's component ratio to direct the syntheses and conversions of four cobalt complexes, provides unprecedented control for crystal engineering.
Discovery of 3-(3-cyano-4-pyridyl)-5-(4-pyridyl)-1,2,4-triazole, FYX-051-a xanthine oxidoreductase inhibitor for the treatment of hyperuricemia
摘要:
Our previous study identified 2-[2-(2-methoxy-ethoxy)-ethoxy]-5-[5-(2-methyl-4-pyridyl)-1H-[1,2,4]-triazol-3-yl]-benzonitrile (2) as a safe and potent xanthine oxidoreductase (XOR) inhibitor for the treatment of hyperuricemia. Here, we synthesized a series of 3,5-dipyridyl-1,2,4-triazole derivatives and, in particular, examined their in vivo activity in lowering the serum uric acid levels in rats. As a result, we identified 3-(3-cyano-4-pyridyl)-5-(4-pyridyl)-1,2,4-triazole (FYX-051, compound 39) to be one of the most potent XOR inhibitors; it exhibited an extremely potent in vivo activity, weak CYP3A4-inhibitory activity and a better pharmacokinetic pro. le than compound 2. Compound 39 is currently being evaluated in a phase 2 clinical trial. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of 5-aryl-3-C-glycosyl- and unsymmetrical 3,5-diaryl-1,2,4-triazoles from alkylidene-amidrazones
作者:Béla Szőcs、Éva Bokor、Katalin E. Szabó、Attila Kiss-Szikszai、Marietta Tóth、László Somsák
DOI:10.1039/c5ra05702g
日期:——
Bromination of the so obtained compounds by NBS gave hydrazonoyl bromide type derivatives which were ring closed to 3-C-glycosyl-5-substituted-1,2,4-triazoles in pyridine or by NH4OAc in AcOH. Under the same conditions O-perbenzoylated N1-arylidene-C-(β-D-glucopyranosyl)-formamidrazones gave the expected 1,2,4-triazoles as minor products only. N1-Arylidene-arenecarboxamidrazones were also transformed
A series of Zn(ii) complexes with 5-(4-R-phenyl)-3-(pyridin-2-yl)-1,2,4-triazoles have been synthesized and subsequently characterized by single crystal X-ray diffraction, 1H-NMR, FT-IR spectroscopy, elemental analyses, ESI-MS, and PXRD.
Syntheses, characterization and molecular structures of novel Ru(ii), Rh(iii) and Ir(iii) complexes and their possible roles as antitumour and cytotoxic agents
作者:Gajendra Gupta、Gunjan Sharma、Biplob Koch、Sunhong Park、Shim Sung Lee、Jinkwon Kim
DOI:10.1039/c3nj00315a
日期:——
A series of organometallic arene platinum group metal complexes of the type [(η6-arene)Ru(L)Cl]PF6 arene = benzene; p-cymene and hexamethylbenzene, L = N, N′ ligands} and [(η5-Cp*)M(L)Cl]PF6 (where M = Rh(III) and Ir(III), L = N, N′ ligands) were synthesized. All complexes were isolated as hexafluoridophosphate salts and characterised by elemental analysis, infrared and NMR spectroscopy. The molecular
Shape-Asymmetry Supramolecular Isomerism in Asymmetrical Ligand PCPs and the Expression Method of Three-Level Isomerism
作者:Xiaonan Gao、Ai-Yun Fu、Yao-Yu Wang
DOI:10.1021/acs.inorgchem.6b00081
日期:2016.5.2
the primary isomer of 1/2/3 due to the difference of dimensionality. Complex 3 possessing different shape-asymmetry of single networks from 1 and 2, is called as the secondary isomer of 1 and 2. Complexes 1 and 2 possess the same topology, single shape-asymmetry networks, but different interpenetration-orientation and interpenetration-asymmetry, and are defined as the tertiary isomers. Distinct differences
molecules confined in the nanospace of porousmaterials by single-crystal X-ray diffraction (SXRD) technique is significant because it leads to deep insight into the adsorption mechanism and the actual state of the adsorbents in molecular level. A recent study revealed that flexibility is one of the important factors to achieve periodic guest accommodation in the nanospace enabling direct observation
通过单晶X射线衍射(SXRD)技术直接观察多孔材料纳米空间中的气体分子具有重要意义,因为它可以在分子水平上深入了解吸附机制和吸附剂的实际状态。最近的一项研究表明,灵活性是在纳米空间中实现周期性客体住宿的重要因素之一,可以直接观察气体分子。在这里,我们报告了一种仅通过配体中的原子交换来调整框架灵活性的便捷策略,这使我们能够轻松构建软纳米空间作为研究气体吸附的最佳平台。事实上,我们成功地使用 SXRD 测量观察到限制在不同配置的柔性多孔配位聚合物 (PCP-N) 孔中的 C2H2 和 CO2 分子,而在晶体学上没有看到与 PCP-N 同构的刚性骨架 (PCP-C) 中的气体分子。PCP-N 的原位粉末 X 射线衍射和吸附测量一致的结果明确表明,骨架可以灵活地转化为以相称的方式捕获气体分子。此外,对于PCP-N,我们发现吸附的气体分子引起显着的结构变化,包括孔隙从一维到三维的尺寸变化,随后,额外