Chromium(II) chemistry. Part 14. Ferromagnetic and antiferomagnetic tetrabromochromates(II)
作者:Musthtaq A. Babar、Leslie F. Larkworthy、Ahmad Yavari
DOI:10.1039/dt9810000027
日期:——
tetrabromochromates(II) are antiferromagnetic. The reflectance spectra indicate tetragonal six-co-ordination of CrII and hence polymeric structures. Like the analogous tetrachlorochromates(II), the magnetic data for the ferromagnetic tetrabromochromates from liquid-nitrogen to room temperature can be reproduced by the high-temperature series-expansion formula for a sheetferromagnet with S= 2, and JBr
A new acid molten salt was prepared and its structureelucidation was conducted by FTIR, 1D NMR, 2DNMR, and mass spectrometry. Further support to elucidate the chemical structure of the 1H,4H-piperazine-N,N′-diium ring of the new acid molten salt was achieved by 1H and 13C NMR, and COSY analyses of 1H,4H-piperazine-N,N′-diium dibromide, which is synthesized and characterized for the first time in
制备了一种新的酸性熔融盐,并通过FTIR,1D NMR,2D NMR和质谱对结构进行了阐明。进一步支持阐明1的化学结构ħ,4 ħ -哌嗪Ñ,Ñ '新酸熔盐-diium环通过实现1 H和13 C NMR,和1的COZY分析ħ,4 ħ -哌嗪-N,N'-二溴化二铵,在本工作中首次合成并表征。FTIR和NMR光谱分析以及pH和滴定分析排除了[SO 4 ] 2-的形成和过量的H 2 SO 4的存在。此外,在DMSO- d 6中未检测到[HSO 4 ] -的酸质子的区别峰。还记录了酸性熔融盐的热相变和热稳定性,这证明了指示剂和硫酸氢根阴离子之间的强相互作用。根据新熔融盐的酸度,我们鼓励研究使用冰醋酸对正戊醇进行乙酰化的催化活性。获得乙酸戊酯,转化率为89.0%,分离产率为78.0%。残留物的1 H NMR光谱显示过量的HOAc和熔融盐,而上层相的1 H NMR谱显示纯的乙酸戊酯。分离上层相后,将残余
Efficient Diffusion-Controlled Ligand Exchange Crystal Growth of Isostructural Inorganic–Organic Halogenidorhodates(III): The Missing Hexaiodidorhodate(III) Anion
作者:Maciej Bujak
DOI:10.1021/cg501694d
日期:2015.3.4
The monohydrates of piperazine-1,4-diium hexabromidorhodate(III) bromide and hexaiodidorhodate(III) iodide were obtained by a diffusion-controlled ligand exchange crystal growth method using a hydrochloric acid solution of rhodium(III) chloride trihydrate and piperazine, dissolved in hydrobromic and hydroiodic acid, respectively, separated by a layer of hydrohalic acid. Both inorganic–organic hybrids
使用三水合氯化铑(III)和哌嗪的盐酸溶液,通过扩散控制的配体交换晶体生长法,获得了哌嗪-1,4-溴化六溴代高碘酸盐(III)和碘化六碘代十二烷(III)的一水合物。氢溴酸和氢碘酸分别被一层氢卤酸隔开。两种无机-有机杂化物均由通式(C 4 H 12 N 2)2 [RhX 6 ] X·H 2 O(X = Br,1或I,2)定义。它们都在正交晶体Pnma中结晶空间群,它们是同构的,同构指数高于95%。阳离子结构单元-哌嗪-1,4-二鎓离子和无机组分-略微扭曲的八面体[RHX 6 ] 3-配合物,分离的X -结晶分子的阴离子和水通过相互作用的相关但不同的系统连接。1和2晶体与无金属(C 4 H 12 N 2)Br 2 ·H 2 O,3和(C 4 H 12 N 2)I晶体的堆积排列和相互作用的比较2 ·I 2,4,清楚地示出的特异性相互作用的发生和层次结构:在含溴化物的结构通过将O被少由X发音或交换/
1,3,4-Oxadiazole amides
申请人:Bristol-Myers Company
公开号:US04001238A1
公开(公告)日:1977-01-04
The 4-amino-6,7-dimethoxy-2-[4-(5-lower alkylthio-1,3,4-oxadiazole-2-carbonyl)-piperazin-1-yl]-quinazolines are potent antihypertensive drugs which have little or no .alpha.-adrenergic blocking activity.