Showing papers by "Mark L. Dietz published in 2004"
TL;DR: In this article, the relationship of the water content and the nature of the IL anion to the mesoscopic structure of the ionogels has been determined using small angle X-ray scattering, and it was shown that near-monodomain materials can be formed with either lamellar, 2D hexagonal or 3-D cubic structures with tunable lattice dimensions.
88 citations
TL;DR: In this paper, cyclic voltammetry (CV) and differential pulse voltameters (DPV) measurements of both [Cnmim]3[α-PW12O40] salts (for n=2 and 5) were performed in acetonitrile containing either tetra-n-butylammonium hexafluorophosphate, abbreviated TBAPF6, or the corresponding [C nmim]BF4 ionic liquids (ILs) as electrolytes.
62 citations
TL;DR: Extended X-ray absorption fine-structure measurements have been used to probe the coordination environment of strontium ion sorbed from aqueous nitric acid solutions on an extraction chromatographic resin comprising a macrocyclic polyether dispersed on a polymeric support.
18 citations
TL;DR: This study clearly shows that cleavage with morpholine is convenient, inexpensive, and allows for the preparation of a variety of P,P′-disubstituted partial esters in good yields and high purity.
17 citations
TL;DR: In this article, a method for the selective cleavage of the corresponding methylenebis(dialkyl phosphonate) with refluxing morpholine has been proposed, which allows for the preparation of a variety of P,P-disubstituted partial esters in good yields and high purity.
Abstract: The preparation of partial esters of methylenebisphosphonic acids has been of recent interest due to their potential therapeutic applications. This paper describes a convenient method to prepare symmetrical methylenebis(alkyl hydrogen phosphonates) by the selective cleavage of the corresponding methylenebis(dialkyl phosphonate) with refluxing morpholine. The effects of structural variations on the amine as well as the substrate have been investigated to understand the scope and limitations of this reaction. A superior approach to hindered bisphosphonic acid esters involves the cleavage of their dimethyl esters, 4, using morpholine. This method is also useful to access a number of C-alkyl dialkyl methylenebisphosphonic acids such as 6. This study clearly shows that cleavage with morpholine is convenient, inexpensive, and allows for the preparation of a variety of P,P'-disubstituted partial esters in good yields and high purity.
1 citations