Jump to main content
Jump to site search


Binding Consistency of Anion by Effect of Aromatic Meta-Substitution of Bis-urea Receptors: Entrapment of Hexafluorosilicate Clusters

Abstract

With cyano group as a terminal substituent, three positional isomeric bis-urea receptors (L1-L3) have been synthesized for extensive analysis of host-anion binding propensity in their neutral form. The existence of electron-withdrawing or π-acidic phenyl substituents in the receptors L1-L3 supports efficient binding of the octahedral hexafluorosilicate anion within their dimeric cavity. L1 and its isomeric cyano-substituted para isomer receptor L3 have been found to entrap water-free naked SiF62-, while meta receptor found to trap hydrated SiF62- within its cavity. In the presence of excess fluorides L1 self-assembles to form dodeca-coordinated hexafluorosilicate complex 1a and L3 self-assembles to form octa-coordinated hexafluorosilicate complex 3a in the solid-state via cooperative and non-cooperative H-bonding interactions of urea moieties respectively. Whereas the meta receptor L2 self-assembles to build 3:2 host-guest assembly, where the two SiF62-- unit shows different coordination environments. FESEM imaging studies corroborated the result obtained from in the solid-state.

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Sep 2019, accepted on 10 Oct 2019 and first published on 10 Oct 2019


Article type: Paper
DOI: 10.1039/C9CE01485C
CrystEngComm, 2019, Accepted Manuscript

  •   Request permissions

    Binding Consistency of Anion by Effect of Aromatic Meta-Substitution of Bis-urea Receptors: Entrapment of Hexafluorosilicate Clusters

    B. Nayak, S. Halder, S. De and G. Das, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE01485C

Search articles by author

Spotlight

Advertisements