NDLI: Encapsulation of $[X_{2}(H_{2}O)_{4}]^{2−}$ (X = F/Cl) clusters by pyridyl terminated tripodal amide receptor in aqueous medium: single crystal X-ray structural evidence

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Arunachalam, M. Chakraborty, Sourav Dutta, Ranjan Ghosh, Pradyut
Description	Author Affiliation: Chakraborty S ( Department of Inorganic Chemistry Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India. icpg@iacs.res.in.)
Abstract	A new tris-amide receptor L based on 1,3,5-methyl substituted benzene platform and pyridyl as an attached unit is synthesized and explored towards anion recognition in aqueous environment. The presence of pyridyl terminal in L facilitates its aqueous solubility. The binding of halides and oxyanions towards L are examined by $^{1}H-NMR$ technique in solution and by single crystal X-ray crystallography in solid state studies. Crystallization of fluoride and chloride with L is carried out in acetone–water (1:1, v/v) binary solvent mixture that yields crystals for respective host–guest complexes, $[L]_{2}·[F_{2}(H_{2}O)_{4}]·[TBA]_{2}$ (1) and $[L]_{2}·[Cl_{2}(H_{2}O)_{4}]·[TBA]_{2}$ (2) suitable for single crystal X-ray diffraction studies. On the other hand, complexation of L with fluoride in dioxane–acetone (1:1, v/v) solvent mixture, results the formation of $SiF_{6}^{2−}$ encapsulated complex, $[L]_{2}·[SiF_{6}(H_{2}O)_{2}]·[TBA]_{2}$ (3). Crystallographic result shows the formation of $[F_{2}(H_{2}O)_{4}]^{2−}$ and $[Cl_{2}(H_{2}O)_{4}]^{2−}$ zipped 1D-polymeric tweezer-like assemblies of L in acetone–water (1:1, v/v) binary solvent mixture in complexes 1 and 2 respectively. Solution state $^{1}H-NMR$ studies in $D_{2}O–acetone-d_{6}$ (1:19, v/v) support 1:4 (host–guest) binding stoichiometry of $F^{−},$ $Cl^{−},$ $Br^{−},$ $NO_{3}^{−},$ $HSO_{4}^{−}$ and $H_{2}PO_{4}^{−}$ with L. Binding constants of these investigated anions with L by 1:1 binding model are calculated which show the following binding order: $NO_{3}^{−}$ ≈ $HSO_{4}^{−}$ > $F^{−}$ ≈ $Cl^{−}$ ≈ $Br^{−}$ > $H_{2}PO_{4}^{−}.$ Further, solution state $^{19}F-NMR$ studies are also carried out to establish the $F^{−}$ binding with L in $DMSO-d_{6}.$
ISSN	14779226
Issue Number	5
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-02-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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