1266573-97-0Relevant academic research and scientific papers
Binding of HgCl2 by a nitro functionalized tripodal receptor and its decomplexation controlled by anion complexation
Dey, Sandeep Kumar,Das, Gopal
, p. 429 - 438 (2011/05/07)
The presence of a nitro functionality on N-bridged tripodal receptors has an effect on its binding ability towards HgCl2 by coordination through one of the nitro oxygen atoms, ethereal oxygen and the bridgehead nitrogen atom. Decomplexation of HgCl2 and recovery of the receptor L can be accomplished by the formation of anion complexes with [L·HgCl2]. The complexation of different anions with multiple protonated receptor units is attributable to intramolecular (N-H) +·A·A·on interactions, at the same time the presence of multiple C- HA·A·A·anion and interligand C-H·A·A·Onitro hydrogen bonds provide added stabilization. Protonation at the bridgehead nitrogen atom and the presence of the nitro functionality render the aliphatic and aryl protons sufficiently acidic for their active participation in moderate to weak C-H·A·A·anion and C- H·A·A·Onitro interactions. Spectroscopic studies provide evidence for the formation of anion complexes from [LA·HgCl2] by extrusion of HgCl2. The strategic use of anion binding as a driving force for the templated assembly of the tripodal ligand L has been accomplished by the reversible complexationand decomplexation of [LA·HgCl2] extruding HgCl2 by employing mildly acidic ammonium salts. Copyright
