A surfactantless, trouble-free, and gentle wet chemistry approach has been used to interpret the precisely controlled growth of β-Ni(OH)(2) with the assistance of ammonia and nickel acetate from seedless mild hydrothermal conditions. A thorough investigation of the reaction kinetics and product morphology with varied concentration of NH(3) and different reaction times suggests that a putative mechanism of dissolution, recrystallization, and oriented attachment supports the intelligent self-assembly of nanobuilding blocks. Associated characterizations (FTIR, PXRD, FESEM, EDAX, HRTEM, and Raman) have identified it to be pure β-Ni(OH)(2) without any signature of contamination. The assembled units result in porous frameworks (nanoflowers and nanocolumns) and are indeed full of communally intersecting nanopetals/nanoplates with both lengths and widths on the order of micrometer to nanometer length scale. The as-synthesized material could also be used as a precursor for nanometric black NiO under calcination. The hydroxide has been found to be a potent and environmentally benign material because it warrants its photocatalytic activity through dye mineralization. Finally, Ni(OH)(2) has been photochemically derivatized with dosages of silver nanoparticles bringing a competent composite authority Ag@Ni(OH)(2), to give a full-proof enhanced field effect of prolific SERS activity. In a nutshell, these results are encouraging and fetch new promise for the fabrication of a low-cost and high-yielding greener synthetic protocol for a functional material with promising practicability.
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http://dx.doi.org/10.1021/ic1015065 | DOI Listing |
Inorg Chem
October 2010
Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.
A surfactantless, trouble-free, and gentle wet chemistry approach has been used to interpret the precisely controlled growth of β-Ni(OH)(2) with the assistance of ammonia and nickel acetate from seedless mild hydrothermal conditions. A thorough investigation of the reaction kinetics and product morphology with varied concentration of NH(3) and different reaction times suggests that a putative mechanism of dissolution, recrystallization, and oriented attachment supports the intelligent self-assembly of nanobuilding blocks. Associated characterizations (FTIR, PXRD, FESEM, EDAX, HRTEM, and Raman) have identified it to be pure β-Ni(OH)(2) without any signature of contamination.
View Article and Find Full Text PDFComb Chem High Throughput Screen
February 1999
Division of Medicinal Chemistry, Central Drug Research Institute, Lucknow, India.
A novel general synthesis of substituted pyrimidine 3 has been carried out on solid support. The C-atoms carring the cyano, amino, carboxamido, as well as anchoring site have exploited to generate libraries of compounds 6-8, 10, 13, 15, 17, 19, 21, 23, 25 and 27. A novel strategy to cleave the resin to resin-site unsubstituted system has been developed and it provides 5,6-disubstituted pyrimidines 6-8.
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