Anion recognition by urea and thiourea groups: Remarkably simple neutral receptors for dihydrogenphosphate

Adamantane bisurea derivatives: anion binding in the solution and in the solid state

“…Binding of H2PO4 -in the stoichiometry 1:2 has already been reported for bisurea derivatives. 29,35 Later, it was shown that stoichiometry 1:2 can be due to the formation of two 36 or 3 intermolecular H-bonds between two H2PO4 -anions. 37 This cooperative effect additionally stabilizes 1:2 stoichiometries rendering them more stable than the …”

Exploring Molecular Recognition Pathways within a Family of Gelators with Different Hydrogen Bonding Motifs.

“…This was initially surprising, because thioureas are known to be excellent hydrogen bond donors-better than ureas. 26 However, in this case, the hydrogen bond acceptor would have to be, predominantly, C<img border="0" alt="double bond; length as m-dash" src="http://cdn.els-cdn.com/sd/entities/dbnd" class="glyphImg">S. Sulfur is a poor hydrogen bond acceptor, and we therefore propose that compound 1-thiourea is unable to establish an effective sample-spanning hydrogen-bonded network due to these ineffective hydrogen-bond acceptor groups.…”

The Different Recognition Mechanism of Carbazole Derivatives for Biological Important Anion: Theory and Experiment

“…Accordingly, a variety of sensing systems, involving amide, urea (thiourea), hydrazine, calix[n]arenes, hydroxyl derivatives have been employed for the selective detection of H 2 PO 4 - [12][13][14][15] . While phenol commonly plays an important role in the anion binding site of biological system, very little investigation has been carried out to develop H 2 PO 4 − sensors bearing phenol and carbazole groups.…”