1538579-86-0Relevant academic research and scientific papers
Encapsulation of [X2(H2O)4]2- (X = F/Cl) clusters by pyridyl terminated tripodal amide receptor in aqueous medium: Single crystal X-ray structural evidence
Chakraborty, Sourav,Dutta, Ranjan,Arunachalam,Ghosh, Pradyut
, p. 2061 - 2068 (2014)
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 1H-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·[F2(H2O)4]·[TBA] 2 (1) and [L]2·[Cl2(H2O) 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 62- encapsulated complex, [L]2·[SiF 6(H2O)2]·[TBA]2 (3). Crystallographic result shows the formation of [F2(H 2O)4]2- and [Cl2(H 2O)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 1H-NMR studies in D2O-acetone-d6 (1 : 19, v/v) support 1 : 4 (host-guest) binding stoichiometry of F-, Cl-, Br-, NO 3-, HSO4- and H2PO 4- with L. Binding constants of these investigated anions with L by 1 : 1 binding model are calculated which show the following binding order: NO3- ≈ HSO4- > F - ≈ Cl- ≈ Br- > H2PO 4-. Further, solution state 19F-NMR studies are also carried out to establish the F- binding with L in DMSO-d 6.
Metallogels derived from silver coordination polymers of C3-symmetric tris(pyridylamide) tripodal ligands: Synthesis of ag nanoparticles and catalysis
Paul, Mithun,Sarkar, Koushik,Dastidar, Parthasarathi
, p. 255 - 268 (2015)
By applying a recently developed crystal engineering rationale, four C3 symmetric tris(pyridylamide) ligands namely 1,3,5-tris(nicotinamidomethyl)-2,4,6-triethylbenzene, 1,3,5-tris(isonicotinamidomethyl)-2,4,6-triethylbenzene, 1,3,5-tris(nicotinamidomethyl)-2,4,6-trimethylbenzene, and 1,3,5-tris(isonicotinamidomethyl)-2,4,6-trimethylbenzene, which contain potential hydrogen-bonding sites, were designed and synthesized for generating AgI coordination polymers and coordination-polymer-based gels. The coordination polymers thus obtained were characterized by single-crystal X-ray diffraction. The silver metallogels were characterized by transmission electron microscopy (TEM) and dynamic rheology. Upon exposure to visible light, these silver metallogels produced silver nanoparticles (AgNPs), which were characterized by TEM, powder X-ray diffraction, energy dispersive X-ray and X-ray photoelectron spectroscopy. These NPs were found to be effectively catalyzed the reduction of 4-nitrophenolate to 4-aminophenolate without the use of any exogenous reducing agent.
