01096nas a2200157   4500008004100000245014700041210006900188260000800257300001400265490000700279520046400286100002100750700001800771700001900789856013000808       2017                        eng d00aTransition metal, azide, and oxidant-free homo- and heterocoupling of ambiphilic tosylhydrazones to the regioselective triazoles and pyrazoles0 aTransition metal azide and oxidantfree homo and heterocoupling o  cAPR  a1534-15370 v193 aWith N-tosylhydrazone as an ambiphilic reagent, an unprecedented cyclization reaction of two identical or different tosylhydrazones has been developed to access various 4,5-disubstituted-2H-triazoles under transition metal, azide, and oxidant-free conditions. A mechanistic.rationalization study led to the identification of several electronically diverse unsaturated systems for regioselective synthesis of 1- and 2-substituted 1,2,3-triazoles and pyrazoles.1 aPanda, Subhankar1 aMaity, Pradip1 aManna, Debasis  uhttps://library.ncl.res.in/content/transition-metal-azide-and-oxidant-free-homo-and-heterocoupling-ambiphilic-tosylhydrazones02407nas a2200205   4500008004100000022001400041245015600055210006900211260000900280300001400289490000700303520165600310100001801966700001701984700001802001700001502019700001702034700001902051856013102070       2022                        eng d  a2050-748800aAntimicrobial two-dimensional covalent organic nanosheets (2D-CONs) for the fast and highly efficient capture and recovery of phosphate ions from water0 aAntimicrobial twodimensional covalent organic nanosheets 2DCONs   cMAR   a4585-45930 v103 a<p>
	The retrieval of depleting resources from wastewater could help resolve the mounting demands for resources in our society. Phosphate is an essential nutrient for all living things. However, the diminution of global reserves of phosphate rock could significantly affect our food security in the near future. At the same time, the removal of phosphates and pathogens is of great importance for water security and de-eutrophication. The specific pH-dependent adsorption and desorption of phosphate ions by water-insoluble adsorbents is an exciting strategy for removing and recovering phosphates from contaminated water. Herein, we report the development of new two-dimensional guanidine-containing covalent organic nanosheets (2D-gCONs). This water-insoluble amorphous polymer (exfoliated) selectively sequestered phosphate ions in the presence of other competing anions and could be reused for multiple cycles. The polymer showed a fast removal of phosphate ions with a maximum adsorption capacity of 398 mg g(-1) (pH 7.0). The sequestered phosphate ions could be easily reclaimed, and the polymer could be recycled just by altering the pH (similar to 10.0) of the aqueous solution. The guanidinium moieties played a pivotal role in exfoliation in aqueous medium and in the antibacterial activities against Gram-negative and Gram-positive bacteria. We hypothesize that the current study may advance the design of water-insoluble CONs to remove and recover phosphate ions from wastewater and could help alleviate the negative impact of water eutrophication. This strategy can also be tweaked to address other severe environmental challenges.</p>
1 aDey, Subhasis1 aDas, Sribash1 aPatel, Anjali1 aRaj, Vipin1 aVanka, Kumar1 aManna, Debasis  uhttps://library.ncl.res.in/content/antimicrobial-two-dimensional-covalent-organic-nanosheets-2d-cons-fast-and-highly-efficient