01475nas a2200241 4500008004100000022001400041245011000055210006900165260007300234300001000307490000700317520058300324653003300907653001400940653002200954653001500976100002200991700002301013700002101036700002001057700002601077856013001103 2012 eng d a1350-417700aUltrasound assisted one pot synthesis of imidazole derivatives using diethyl bromophosphate as an oxidant0 aUltrasound assisted one pot synthesis of imidazole derivatives u aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN a94-960 v193 a

A one pot, three-component condensation of benzoin/benzyl, an aldehyde, and ammonium acetate using diethyl bromophosphate as a mild oxidant is achieved to form trisubstituted imidazole compounds. Under ultrasound irradiation, a smooth condensation occurs to get the 2, 4, 5-triaryl-1H-imidazole compounds in good to excellent yields. The study explores the scope and limitation of diethyl bromophosphate as an oxidant and suggests advantages, viz., simplicity of operation, reduction in time, and an increase in product yields. (C) 2011 Elsevier B.V. All rights reserved.

10aDiethyl bromophosphate (DEP)10aImidazole10aOne pot synthesis10aUltrasound1 aNagargoje, Deepak1 aMandhane, Priyanka1 aShingote, Savita1 aBadadhe, Pravin1 aGill, Charansingh, H. uhttps://library.ncl.res.in/content/ultrasound-assisted-one-pot-synthesis-imidazole-derivatives-using-diethyl-bromophosphate-003096nas a2200301 4500008004100000245011200041210006900153260000800222300000800230490000700238520212000245653001102365653001402376653001802390653001402408653001502422653001402437653001702451653002602468100002302494700002102517700002402538700002602562700002902588700002102617700002602638856013002664 2022 eng d00aSynthesis and crystal structures of Mn(II) and Co(II) complexes as catalysts for oxidation of cyclohexanone0 aSynthesis and crystal structures of MnII and CoII complexes as c cJUL a1000 v103 a

The global demand on adipic usage in the production of plasticizers and synthetic polyamide is increasing. In line with the search for an efficient and energy-conserving way to isolate adipic acid (AA) in good yields, this paper introduces the oxidization of cyclohexanone utilizing two new coordination compounds, [Mn(2,6-pydc)(2)](imi) (1) and [Co(H(2)pza)(2)(H2O)(2)(NO3)].NO3 (2), as catalysts. Compounds 1 and 2 were synthesized by room temperature and refluxing methods, and characterized by spectral analyses (IR and UV-Vis.), SEM, BET, TGA, elemental, and X-ray crystallography. The single crystal structure of compound 1 revealed that pyridinedicarboxylate (2,6-pydc) and imidazole (imi) moieties were coordinated to the Mn(II) atom through imine nitrogen and deprotonated oxygen atoms, to form an undistorted octahedral coordination geometry with the N2O4 donor set. The axial and equatorial planes containing O2, O4, O5, and O7 atoms were from two adjacent 2,6-pydc ligands which formed the unidendate donor ligand; imi, on the other hand, acted as a bidendate donor ligand. For compound 2, the Co(II) atom was being coordinated by two pyrazinamide (H(2)pza) moieties, which acted as an unidendate donor ligand; two water molecules occupying the axial position, and one nitrate molecule occupying the apical position, were within the coordination sphere; a nitrate molecule was disordered outside the coordination sphere. The distance, 4.658 angstrom, between the Co1 atom and the N8 atom of the uncoordinated nitrate molecule, was within the range reported elsewhere. Cyclohexanone peroxidation experiments revealed that compound 1 exhibited unique catalytic performance by giving a 72.8% yield in adipic acid, in comparison to the 71.3% yield obtained with compound 2. The yields in AA were maintained by way of recyclability evaluation. The reaction kinetics of compound 2 gave less activation energy, E-a 2938 J mol(-1), while the thermodynamic parameters indicated that the chemical reactivity of cyclohexanone on the active surfaces of compounds 1 and 2 was via monolayer physisorption.

10acobalt10aComplexes10acyclohexanone10aImidazole10amanaganese10aOxidation10apyrazinamide10apyridinedicarboxylate1 aTella, Adedibu, C.1 aIsaac, Aaron, Y.1 aClayton, Hadley, S.1 aOgunlaja, Adeniyi, S.1 aVenugopalan, Aswathy, T.1 aPrabu, Marimuthu1 aThirumalaiswamy, Raja uhttps://library.ncl.res.in/content/synthesis-and-crystal-structures-mnii-and-coii-complexes-catalysts-oxidation-cyclohexanone03170nas a2200301 4500008004100000022001400041245013900055210006900194260000800263300001600271490000700287520214300294653001302437653003002450653002902480653001402509653003002523653003302553100001902586700001802605700001802623700002502641700001702666700001602683700002502699700002002724856012402744 2023 eng d a1944-824400aMitigating dendrite formation on a Zn electrode in aqueous zinc chloride by the competitive surface chemistry of an imidazole additive0 aMitigating dendrite formation on a Zn electrode in aqueous zinc  cMAY a23093-231030 v153 a

Electrochemical energy storage systems are critical in several ways for a smooth transition from nonrenewable to renewable energy sources. Zn-based batteries are one of the promising alternatives to the existing state-of-the-art Li-ion battery technology, since Li-ion batteries pose significant drawbacks in terms of safety and cost-effectiveness. Zn (with a reduction potential of -0.76 V vs SHE) has a significantly higher theoretical volumetric capacity (5851 mAh/cm3) than Li (2061 mAh/cm3), and it is certainly far less expensive, safer, and more earth-abundant. The formation of dendrites, hydrogen evolution, and the formation of a ZnO passivation layer on the Zn anode are the primary challenges in the development and deployment of rechargeable zinc batteries. In this work, we examine the role of imidazole as an electrolyte additive in 2 M ZnCl2 to prevent dendrite formation during zinc electrodeposition via experimental (kinetics and imaging) and theoretical density functional theory (DFT) studies. To characterize the efficacy and to identify the appropriate concentration of imidazole, linear sweep voltammetry (LSV) and chronoamperometry (CA) are performed with in situ monitoring of the electrodeposited zinc. The addition of 0.025 wt % imidazole to 2 M ZnCl2 increases the cycle life of Zn-symmetric cells cycled at 1 mA/cm2 for 60 min of plating and stripping dramatically from 90 to 240 h. A higher value of the nucleation overpotential is noted in the presence of imidazole, which suggests that imidazole is adsorbed at a competitively faster rate on the surface of zinc, thereby suppressing the zinc electrodeposition kinetics and the formation. X-ray tomography reveals that a short circuit caused by dendrite formation is the main plausible failure mechanism of Zn symmetric cells. It is observed that the electrodeposition of zinc is more homogeneous in the presence of imidazole, and its presence in the electrolyte also inhibits the production of a passivating coating (ZnO) on the Zn surface, thereby preventing corrosion. DFT calculations conform well with the stated experimental observations.

10adendrite10aDensity functional theory10aexchange current density10aImidazole10aX-ray computed tomography10azinc metal electrodeposition1 aRana, Ashutosh1 aThakare, Anup1 aKumar, Nikhil1 aMukherjee, Buddhadev1 aTorris, Arun1 aDas, Bidisa1 aOgale, Satishchandra1 aBanerjee, Abhik uhttps://library.ncl.res.in/content/mitigating-dendrite-formation-zn-electrode-aqueous-zinc-chloride-competitive-surface01905nas a2200289 4500008004100000022001400041245004600055210004400101260000900145490000700154520110600161653001801267653001401285653001501299653001701314653001501331100001901346700001801365700002001383700002501403700002401428700001701452700002401469700002101493700002201514856007901536 2023 eng d a1434-194800aZwitterionic tetrastanna(II) cyclic crown0 aZwitterionic tetrastannaII cyclic crown cOCT 0 v263 a

A 12-membered zwitterionic tetrastanna(II) cycle 1 having a crown ether-like topology has been isolated from the deprotonation of 1,1 & PRIME;-methylenediimidazole (B) with two equivalents of Sn[N(SiMe3)(2)](2) (A). The solid-state structure and NMR analysis confirms the tetrastanna(II) cycle 1 to be comprised of two stannate(II) and two stannyliumylidene ion pairs in alternating positions of the heterocycle. Computational analysis shows greater nucleophilicity at the proximally located stannate(II) centers. Nonetheless, the tetrastanna(II) cycle 1 remains poorly reactive due to engagement of Sn-II lone pair electrons in intramolecular donor-acceptor interactions. Simple deprotonation reaction between Sn[N(SiMe3)(2)](2) (A) and N-(diisopropylphenyl)imidazole (C) in equimolar ratio has led to a stannylene 2, involving the formation of a Sn-C covalent bond with the anionic imidazol-2-yl carbon center along with the release of NH(SiMe3)(2). Compound 2 exists as a dimer, where the unsubstituted ring nitrogen atom coordinated intermolecularly to the other stannylene center.

10aDeprotonation10aImidazole10aMacrocycle10aSn-II cation10astannylene1 aSahoo, Padmini1 aChibde, Purva1 aDas, Satyabrata1 aBanerjee, Subhrashis1 aMali, Bhupendra, P.1 aVanka, Kumar1 aGonnade, Rajesh, G.1 aYildiz, Cem., B.1 aMajumdar, Moumita uhttps://library.ncl.res.in/content/zwitterionic-tetrastannaii-cyclic-crown