01111nas a2200169   4500008004100000245006400041210006300105260000800168300001400176490000800190520054700198100002600745700001800771700003100789700002500820856009600845       2017                        eng d00aNickel-catalyzed direct synthesis of dialkoxymethane ethers0 aNickelcatalyzed direct synthesis of dialkoxymethane ethers  cAUG  a1153-11590 v1293 aA simple and efficient method for the preparation of dialkoxymethane ethers (oxymethylene ethers) from alcohols and paraformaldehyde in the presence of commercially available nickel(II) salt is described. The reaction proceeds readily under neutral, solvent-free conditions using paraformaldehyde as a C-1 source. The present strategy has a broad substrate scope including aliphatic (both primary and secondary) and aromatic alcohols and provides a benign method for the preparation of symmetrical dialkoxymethanes in good yields (up to 89%).1 aSubaramanian, Murugan1 aBera, Abhijit1 aPrasad, Bhagavatula, L. V.1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/nickel-catalyzed-direct-synthesis-dialkoxymethane-ethers01209nas a2200145   4500008004100000022001400041245009700055210006900152260000800221490000700229520065500236100001800891700003100909856012300940       2018                        eng d  a0250-470700a2D molecular precursor for a one-pot synthesis of semiconducting metal sulphide nanocrystals0 a2D molecular precursor for a onepot synthesis of semiconducting   cOCT0 v413 a2D molecular materials, namely, metal alkyl thiolates, have been used as a single-source precursor for the synthesis of semiconducting metal sulphide nanocrystals (NCs) by thermal decomposition. These 2D molecular precursors have all the ingredients required for metal sulphide synthesis (metal source, sulphur source and protecting ligand). In this study, we demonstrate a simple and general solvothermal decomposition' approach for the synthesis of high-quality , PbS, CdS, MnS and ZnS NCs. The size of the NC can also be controlled by changing the decomposition temperature. Furthermore, the optical properties of the NCs have also been studied.
1 aBera, Abhijit1 aPrasad, Bhagavatula, L. V.  uhttps://library.ncl.res.in/content/2d-molecular-precursor-one-pot-synthesis-semiconducting-metal-sulphide-nanocrystals02129nas a2200181   4500008004100000245012800041210006900169260000800238300001400246490000700260520143600267100001801703700002201721700002701743700001901770700003001789856012801819       2018                        eng d00aGeneric and scalable method for the preparation of monodispersed metal sulfide nanocrystals with tunable optical properties0 aGeneric and scalable method for the preparation of monodispersed  cMAY  a5788-57970 v343 a<p>A rational synthetic method that produces monodisperse and air-stable metal sulfide colloidal quantum dots (CQDs) in organic nonpolar solvents using octyl dithiocarbamic acid (C(8)DTCA) as a sulfur source, is reported. The fast decomposition of metal-C(8)DTCA complexes in presence of primary amines is exploited to achieve this purpose. This novel technique is generic and can be applied to prepare diverse CQDs, like CdS, MnS, ZnS, SnS, and In2S3, including more useful and in-demand PbS CQDs and plasmonic nanocrystals of Cu2S. Based on several control reactions, it is postulated that the reaction involves the in situ formation of a metal-C(8)DTCA complex, which then reacts in situ with oleylamine at slightly elevated temperature to decompose into metal sulfide CQDs at a controlled rate, leading to the formation of the materials with good optical characteristics. Controlled sulfur precursor's reactivity and stoichiometric reaction between C(8)DTCA and metal salts affords high conversion yield and large-scale production of monodisperse CQDs. Tunable and desired crystal size could be achieved by controlling the precursor reactivity by changing the reaction temperature and reagent ratios. Finally, the photovoltaic devices fabricated from PbS CQDs displayed a power conversion efficiency of 4.64% that is comparable with the reported values of devices prepared with PbS CQDs synthesized by the standard methods.</p>1 aBera, Abhijit1 aMandal, Debranjan1 aGoswami, Prasenjit, N.1 aRath, Arup, K.1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/generic-and-scalable-method-preparation-monodispersed-metal-sulfide-nanocrystals-tunable01954nas a2200157   4500008004100000245010600041210006900147260000800216300001800224490000600242520135700248100001801605700001801623700003001641856012501671       2018                        eng d00aSolvent-less solid state synthesis of dispersible metal and semiconducting metal sulfide nanocrystals0 aSolventless solid state synthesis of dispersible metal and semic  cJUL  a12006–120160 v63 aMonolayer protected metal and metal sulfide nanocrystals (NCs) have mainly two constituents; the inorganic metal or metal chalcogenide complex as core and organic molecule as shell. Noticing that metal thiolates have these ingredients inbuilt in their structure, we investigated them as possible precursors for the preparation of monolayer protected metal and metal sulfide NCs via solid state grinding method. Accordingly silver and gold NCs have been prepared using a solvent less green approach, by the simple and convenient solid state grinding of the corresponding metal thiolate with sodium borohydride. Similarly, a large variety of uniform-sized semiconducting NCs of metal sulfides including PbS, CdS, ZnS, MnS, Ag2S, and CuS could also be synthesized by the same solid state route by grinding the metal thiolates with octyl dithiocarbamic acid (C8DTCA) and in some cases C8DTCA plus small amount of oleylamine as sulfur source. Interestingly, this simple technique could be used to prepare sub-3 nm NCs like Ag2S, PbS, and CuS which are otherwise difficult to prepare by the conventional high temperature solution routes also. Most gratifyingly, all these NCs, though were prepared by a solvent less grinding method, could be easily dispersed in nonpolar solvents as the preparation method ensued the formation of organic molecule capped NCs.1 aBera, Abhijit1 aBusupalli, B.1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/solvent-less-solid-state-synthesis-dispersible-metal-and-semiconducting-metal-sulfide00638nas a2200157   4500008004100000022001400041245013000055210006900185260000800254300001000262490000600272100001800278700002600296700003100322856012700353       2020                        eng d  a2168-048500aSolvent-less solid state synthesis of dispersible metal and semiconducting metal sulfide nanocrystals (vol 6, pg 12006, 2018)0 aSolventless solid state synthesis of dispersible metal and semic  cNOV  a170000 v81 aBera, Abhijit1 aBusupalli, Balanagulu1 aPrasad, Bhagavatula, L. V.  uhttps://library.ncl.res.in/content/solvent-less-solid-state-synthesis-dispersible-metal-and-semiconducting-metal-sulfide-002173nas a2200217   4500008004100000022001400041245017900055210006900234260000800303300001200311490000600323520133800329653004101667653002401708653002901732100001801761700002301779700001801802700000501820856013001825       2021                        eng d  a2196-735000aLamellar bimetallic thiolates: synthesis, characterization, and their utilization for the preparation of bimetallic chalcogenide nanocrystals through mechanochemical grinding0 aLamellar bimetallic thiolates synthesis characterization and the  cDEC  a21008980 v83 aThiolates of single metal ions are known to exist as lamellar structures in the neat state and some of these metal thiolates can be delaminated into individual molecular sheets simply by adding a nonpolar organic solvent. It is established here that even bimetallic thiolates such as copper-indium thiolate and silver-indium thiolate exist as lamellar sheets. Each of these sheets consists of both metal ions arranged in a random fashion. It is also demonstrated that these bimetallic thiolates can be employed as single source precursors to prepare phase pure bimetallic chalcogenide nanocrystals (NCs) through mechanochemical routes by grinding them with an appropriate chalcogenide source. Notably, these bimetallic chalcogenide NCs, though synthesized in the absence of any solvent, get easily dispersed in nonpolar solvents as their surface is protected by the thiolate molecules released during the grinding process. These ternary NCs display a strong and tunable photoluminescence in the visible to near-infrared region. Based on detailed systematic studies it is concluded that to obtain phase pure bimetallic sulfide/selenide NCs bimetallic thiolates, consisting of both metal ions in each sheet, must be used as single source precursors and physical mixtures of individual thiolates do not afford such phase pure materials.10abimetallic chalcogenide nanocrystals10abimetallic thiolate10amechanochemical grinding1 aBera, Abhijit1 aPathak, Sushil, S.1 aKotha, Vishal1 a  uhttps://library.ncl.res.in/content/lamellar-bimetallic-thiolates-synthesis-characterization-and-their-utilization-preparation