Interactions of guanidinium with benzene-sulphonic, -phosphonic and -arsonic acids and several of their nitro-derivatives

The three-dimensional hydrogen-bonded structures in the ammonium and sodium salt hydrates of 4-aminophenylarsonic acid

“…These structures are among only a small number of examples in the crystallographic literature involving this acid in any form, which include the complexes with silver, zinc, cadmium and lead (Lesikar-Parrish et al, 2013), uranium (Adelani et al, 2012) and the sodium salt of a hybrid organic-inorganic polyoxovanadate cluster complex formed with arsanilate anions (Breen & Schmitt, 2008). Similarly, structures involving phenylarsonic acid are uncommon and are restricted to the parent acid [Shimada, 1960;Lloyd et al, 2008 (this latter report includes the 4-fluoro-, 4-fluoro-3-nitro-, 3-amino-4-hydroxy-and 3-amino-4-methoxy-derivatives)] and the salt adducts guanidinium phenylarsonate-guanidinewater (1/1/2) (Smith & Wermuth, 2010), bis(guanidinium) phenylarsonate-water (1/2) (Latham et al, 2011) and ammonium 4-nitrophenylarsonate (Yang et al, 2002).…”

Crystal structure and hydrogen bonding in the water-stabilized proton-transfer salt brucinium 4-aminophenylarsonate tetrahydrate

“…Water-stabilized achiral carboxylate examples include BRU + hydrogen fumarate À Á1.5H 2 O (Thomas, 1905;Steverding, 2010) and as a monohydrated sodium salt (atoxyl) which had early usage as an anti-syphilitic (Ehrlich & Bertheim, 1907;Bosch & Rosich, 2008). Simple p-arsanilate salt structures are not common in the Cambridge Structural Database (Groom et al, 2016), with only the NH 4 + and K + salts (Smith & Wermuth, 2014) and the guanidinium salts Latham et al, 2011) being known.…”

Pentafluorophenylphosphonic Acid as a New Building Block for Molecular Crystal Fabrication

“…Owing to this structural peculiarity, metal arylphosphonates are amenable to intercalation type reactions, exhibit ion exchange properties, can be used as heterogeneous acid catalysts, and show good prospects as proton conductors . Yet, despite the large body of literature available on these latter materials, only a limited number of papers have been published concerning the use of phenylphosphonic acid in crystal engineering studies. − Even more surprisingly, just one report could be found concerning the crystallographic characterization of fluorinated arylphosphonic acids, in sharp contrast with the fact that fluorine-containing molecules are now emerging as important building blocks for molecular assembly fabrication . We wish to continue this theme here and report on the synthesis of molecular crystals derived from pentafluorophenylphosphonic acid ( 4 ) (Scheme ).…”

“…Proton conductivity investigations of 4·4·H 2 O and 4·4 – ·H 3 O + are currently underway and will be the focus of a separate report . In connection with ion exchange applications, the exposed results set the ground for further studies aimed at assessing to what extent the use of other kinds of organic templates or metal cations modifies the architectures of the derivatives of 4 and whether the use of biologically relevant amines is suitable for the preparation of multicomponent assemblies of pharmaceutical significance. ,,, Finally, the computational evaluation of 4·4·H 2 O and 4·4 – ·H 3 O + reported in this work suggests that this family of fluorinated compounds and their derivatives may show interesting prospects as molecular semiconductors, a research area that is currently receiving increased attention. − …”