title: Metallogels derived from silver coordination polymers of C3-symmetric tris(pyridylamide) tripodal ligands: synthesis of Ag nanoparticles and catalysis.
abstract: 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 Ag(I) 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.
authors.affiliation: Department of Organic Chemistry, Indian Association for the Cultivation of Science (IACS), 2A and 2B, Raja S. C. Mullick Road, Jadavpur, Kolkata, 700032, West Bengal (India), Fax: (+91) 33-2473-2805.
authors.forename: Mithun
authors.initials: M
authors.lastname: Paul
authors.forename: Koushik
authors.initials: K
authors.lastname: Sarkar
authors.forename: Parthasarathi
authors.initials: P
authors.lastname: Dastidar
mesh_terms: D002384:Catalysis; D005782:Gels / Q000737:chemistry*; D006860:Hydrogen Bonding; D008024:Ligands; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D056951:Photoelectron Spectroscopy; D011108:Polymers / Q000737:chemistry*; D012212:Rheology; D012834:Silver / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D014961:X-Ray Diffraction
chemical_list: D005782:Gels; D008024:Ligands; D011108:Polymers; D012834:Silver
keywords: coordination polymers; gels; homogeneous catalysis; metallogels; nanoparticles; supramolecular chemistry