Reversible anion-templated self-assembly of [2+2] and [3+3] metallomacrocycles containing a new dicopper(i) motif
作者:Emily F. V. Dry、Jack K. Clegg、Boris Breiner、Daniel E. Whitaker、Roman Stefak、Jonathan R. Nitschke
DOI:10.1039/c1cc11206f
日期:——
A new dicopper(I) complex is reported that can be incorporated into extended architectures through multitopic carboxylate linkers; reversible carboxylate templation under pH control led to the formation of [2+2] and [3+3] metallomacrocycles.
Reaction of (π-C5H5)2TiCl2 with sodium terephthalate in aqueous solution gives the tetrameric terephthalato complex [(π-C5H5)2TiOCOC6H4OCO]4 in excellent yields. The product contains a 36-membered folded ring.
An efficient and practicalarenehydrogenation procedure based on the use of heterogeneous platinum group catalysts has been developed. Rh/C is the most effective catalyst for the hydrogenation of the aromatic ring, which can be conducted in iPrOH under neutral conditions and at ordinary to medium H2 pressures (<10 atm). A variety of arenes such as alkylbenzenes, benzoic acids, pyridines, furans, are
Extended Members of the Layered Rare‐Earth Hydroxide Family, RE
<sub>2</sub>
(OH)
<sub>5</sub>
NO
<sub>3</sub>
<b>·</b>
<i>n</i>
H
<sub>2</sub>
O (RE = Sm, Eu, and Gd): Synthesis and Anion‐Exchange Behavior
作者:Kyung‐Hee Lee、Song‐Ho Byeon
DOI:10.1002/ejic.200801052
日期:2009.3
Three new layered rare-earth hydroxides (LRHs), RE(OH)2.5(NO3)0.5·xH2O (RE = Gd, Eu, and Sm), have been prepared by a hydrothermal reaction. These materials correspond to the extendedmembers of the RE2(OH)5NO3·nH2O (RE = the rare-earth series) family. Although it has been suggested that the LRH structure seems to be kinetically favored by yttrium or (the second half of) the small rare-earth ions,
Removal of organic acids from dilute aqueous solutions of salts of
申请人:E. I. Du Pont de Nemours and Company
公开号:US04250331A1
公开(公告)日:1981-02-10
Process for recovering carboxylic acids from dilute aqueous solutions of alkali metal salts of such carboxylic acids by mixing such solutions with from 10 to 1000% of a supercritical solution comprising at least 10 mole % carbon dioxide at a pressure from 80 to 500 atm and preferably 100 to 350 atm and at a temperature of from 35.degree. to 200.degree. C. and preferably from 35.degree. to 100.degree. C. whereby the salt reacts with the carbon dioxide to form the carboxylic acid which dissolves in the supercritical fluid. The aqueous phase is allowed to separate from the supercritical fluid phase. The pressure of the supercritical phase is lowered which lowers the solubility of the carboxylic acid in the supercritical fluid so that an acid phase is formed separate from the supercritical fluid phase whereby recovery of the acid is effected.