Publications by authors named "Chandrasekhar V"

Multiterminal Josephson junctions (MTJJs), devices in which a normal metal is in contact with three or more superconducting leads, have been proposed as artificial analogs of topological crystals. The topological nature of MTJJs manifests as a modulation of the quasiparticle density of states (DOS) in the normal metal that may be probed by tunneling measurements. We show that one can reveal this modulation by measuring the resistance of diffusive MTJJs with normal contacts, which shows rich structure as a function of the phase differences {ϕ_{i}}.

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Article Synopsis
  • - The study discusses the creation of three indium complexes (1-3) using different chelating ligands (L1-L3), which were analyzed through multinuclear NMR and confirmed by single-crystal X-ray crystallography.
  • - Indium complex 1, when combined with phenylsilane and NaI, efficiently reduces nitroarenes into amines, achieving good yields.
  • - The reduction process is effective for nitroarenes with various functional groups under standard reaction conditions.
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The COCONUT (COlleCtion of Open Natural prodUcTs) database was launched in 2021 as an aggregation of openly available natural product datasets and has been one of the biggest open natural product databases since. Apart from the chemical structures of natural products, COCONUT contains information about names and synonyms, species and organism parts in which the natural product has been found, geographic information about where the respective sample has been collected and literature references, where available. COCONUT is openly accessible at https://coconut.

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Triarylboron compounds have been established as promising candidates in optoelectronic applications. However, realizing multi-functional properties in triaryl boron-based materials remains challenging. Herein, we present two regioisomers, 1 and 2, designed judiciously by connecting a dimethylamino donor and a dimesitylboryl acceptor at 1,4 and 2,6-positions of the naphthalene spacer, respectively.

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  • The study focuses on synthesizing various bis-amidinate indium(III) monochlorides by reacting specific Li-amidinate ligands with InCl.
  • Single crystal X-ray analysis shows that these compounds feature an In(III) center coordinated with two amidinate ligands, creating a distorted trigonal bipyramidal geometry.
  • The photophysical properties of these compounds were examined, revealing that they are emissive in solution, with the 9-anthryl compound achieving a quantum yield of 45.5% and a lifetime of 11 ns in dichloromethane.
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  • Eating epilepsy is a rare condition in children where seizures are triggered specifically by eating, as demonstrated in a case of an eight-year-old girl with seizures primarily occurring during meals.
  • Despite normal results from various diagnostic tests, her EEG indicated a seizure disorder, leading to a diagnosis of reflex eating epilepsy after ruling out other similar conditions.
  • Treatment with oral sodium valproate significantly reduced the frequency of her seizures during meals, improving her overall symptoms.
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  • Fructose-1,6-bisphosphatase 1 (FBP1) deficiency is a rare genetic disorder affecting gluconeogenesis, leading to severe hypoglycemia and lactic acidosis in infants.
  • A case study of a 1.5-year-old girl revealed symptoms like vomiting and failure to thrive, ultimately diagnosed through genetic testing that confirmed a mutation in the FBP1 gene.
  • Management involved dietary changes to limit simple sugars and increase complex carbohydrates, highlighting the complexities of diagnosing rare metabolic disorders through genetic means.
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Background Myofunctional therapy has shown promise in addressing sleep-disordered breathing. This study aimed to investigate the efficacy of myofascial exercise and voluntary breathing techniques in reducing the apnea-hypopnea index (AHI) among adolescents. Methodology In this randomized controlled study, adolescents aged 13-18 with sleep-disordered breathing were randomly assigned to one of three groups (n=40 per group): myofascial exercise, voluntary breathing techniques, and a standard care control group.

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An hydrolysis of the P-Cl bonds of the carbophosphazene [{NC(NMe)}{NPCl}] (L) in the presence of hydrated lanthanide(III) nitrates in a dichloromethane and methanol (2 : 1) solvent mixture afforded a series of novel 1D coordination polymers: [{Ln(L)(NO)(CHOH)(HO)} (Cl)] {where Ln(III) = Gd (1), Tb (2), Dy (3), or Er (4) and L is the hydrolyzed carbophosphazene (L) ligand}. X-ray crystallographic analysis revealed that complexes 1-4 are isostructural and crystallized in the monoclinic crystal system having 2/ space group. The coordination polymers are formed because of the involvement of the geminal P(O)(OH) moieties of the carbophosphazene ligand.

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A series of tri-coordinated zinc alkyl complexes with the general molecular formula [-{NHIP(Ph)(E)N-Dipp}ZnEt] [R = Dipp (2,6-diisopropylphenyl), E = S (3a), Se (3b) and R = Bu (-butyl), E = S (4a), Se (4b)] bearing imino-phosphanamidinate chalcogenide ligands were prepared in good yields from the reaction between the protic imino-phosphanamidinate chalcogenide ligand [NHIP(Ph)(E)NH-Dipp] [R = Dipp, E = S (1a), Se (1b) and R = Bu, E = S (2a), Se (2b)] and diethylzinc at room temperature. The molecular structures of all the zinc complexes were established by single-crystal X-ray diffraction analysis. In the solid state, all complexes exhibited a distorted trigonal planar geometry around the zinc ion.

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A rigid pentadentate chelating ligand (HL) has been utilized to synthesize a series of octacoordinate mononuclear complexes, [Dy(L)(PhPO)(OOCR)] (where R = CH (1), C(CH) (2), CF (3)) and a dinuclear complex, [Dy(L)(PhPO){(OOC)CH}] (4) based on the highly anisotropic Dy(III) ion. All the complexes were structurally characterized by single-crystal X-ray diffraction studies. The complexes were formed by the coordination action of the dianionic pentadentate ligand [L], one phosphine oxide, and carboxylate ligands.

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Background: Biocontrol is regarded as a viable alternate technique for managing sugarcane wilt disease caused by Fusarium sacchari. Many fungal antagonists against F. sacchari, have been reported, but the potential of bacterial antagonists was explored to a limited extent, so the present study evaluated the antagonistic potential of rhizoplane Bacillus species and their mode of action.

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Phosphonate and phosphate ligands have historically received less attention when compared to the widely prevalent carboxylate ligand system. Phosphonates possess multiple donating sites, often leading to the formation of larger aggregates with limited solubility. Conversely, the P-O bond within phosphates is highly susceptible to hydrolysis, resulting in the precipitation of insoluble compounds, particularly when interacting with lanthanide metal ions.

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A series of novel amidinate ligated four-coordinated boron compounds, [(Ar)-C(BuN)BF] (1BF2-6BF2), were synthesised and structurally characterised (Ar = 1-phenyl, 2-naphthyl, 2-anthryl, 9-anthryl, 9-phenanthryl and 1-pyrene). The increased π-conjugation of Ar-substitution on the amidinate ligand results in dark blue-emission in compounds 3BF2-6BF2. All these compounds are emissive in the solution state.

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In recent years, cheminformatics has experienced significant advancements through the development of new open-source software tools based on various cheminformatics programming toolkits. However, adopting these toolkits presents challenges, including proper installation, setup, deployment, and compatibility management. In this work, we present the Cheminformatics Microservice.

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We report three Co-based complexes with the general formula [Co(L)(X)] by changing the halide/pseudo-halide ions [X = NCSe (1SeCN); Cl (2Cl) and Br (3Br)]. The obtained and values confirm a distorted square pyramidal geometry around the Co ion in all these complexes. In these three complexes, the central Co ion is situated above the basal plane of the square pyramidal geometry.

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We developed a bench-stable iminopyridine-ligated zinc complex for the effective catalytic hydroboration of esters and nitriles under solvent-free conditions. Various esters and nitriles bearing different functionalities were selectively reduced to form corresponding alcohols and amines in good yields. Detailed Hammett plots are provided to explain the electronic effects on the phenyl ring.

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The synthesis, structure and magnetic properties of homometallic hexanuclear lanthanide complexes [Ln(HL)(tfa)(S)]·2NO· HO·MeOH (1, Ln = Gd, S = MeOH, = 0, = 0; 2, Ln = Tb, S = HO, = 2, = 2; 3, Ln = Dy, S = MeOH, = 0, = 2; 4, Ln = Er, S = MeOH, = 0, = 2). [(HL) = 6-((bis(2-hydroxyethyl)amino)-'-(2-hydroxybenzylidene)picolinohydrazide) (tfa = trifloroacetylacetone)] are reported. These hexanuclear assemblies are made up of two trinuclear triangular sub-units linked through the oxygen atoms of two phenoxide bridging groups in a corner sharing arrangement.

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A cesium imino-phosphanamidinate, [{NHIP(Ph)NDipp}Cs], enabling efficient ring-opening (co)polymerization of -LA and ε-CL is disclosed. Owing to the highly controlled polymerization, precise di-block copolymers (PLA--PCL) with different block lengths can be produced by a simple one-pot reaction. NMR, GPC, DSC and microscopic analyses confirm the production of di-block copolymers with crystalline properties.

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A series of differently substituted 2-(2-hydroxyphenyl) benzimidazoles were synthesized by a coupling reaction involving aryl dibromides and 2-hydroxyphenyl benzimidazole. These ligands react with BF·EtO to yield the corresponding boron complexes. The photophysical properties of the ligands (L1-L6) and the boron complexes (1-6) were studied in the solution state.

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The synthesis, characterization, and catalytic application of six aluminum alkyl complexes supported by various imino-phosphanamidinate chalcogenide ligands are described. Six different unsymmetrical imino-phosphanamidinate chalcogenide ligands [NHIP(Ph)(E)NH-Dipp] [R = 2,6-diisopropylphenyl (Dipp), E = S (2a-H), Se (2b-H); R = mesityl (Mes), E = S (3a-H), Se (3b-H); R = -butyl (Bu), E = S (4a-H), Se (4b-H)] were prepared by the oxidation of respective imino-phosphanamide ligands (1a, 1b and 1c) with elemental chalcogen atoms (S and Se). The aluminum complexes with imino-phosphanamidinate chalcogenide ligands with the general formulae [κ-{NHIP(Ph)(E)N-Dipp}AlMe] [R = Dipp, E = S (5a), Se (5b); R = Mes, E = S (6a), Se (6b)] or [κ-{NHIP(Ph)(E)N-Dipp}AlMe] [R = Bu, E = S (7a), Se (7b)] were synthesized in good yields from the reaction of the suitable protic ligands (2a,b-H-4a,b-H) and trimethylaluminum in a 1 : 1 molar ratio in toluene at room temperature.

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Article Synopsis
  • The compound [(L)Dy(CyPO)]·[BPh] (1-Dy) was synthesized and showed a unique pentagonal bipyramidal structure around the Dy(III) ion when analyzed crystallographically.
  • AC magnetic susceptibility measurements indicated that 1-Dy behaves as a single-molecule magnet, evidenced by specific frequency-dependent signals in the absence of a static magnetic field.
  • Further analysis revealed that under-barrier magnetic relaxations like Raman and quantum tunneling of magnetization (QTM) significantly influence the energy barrier for magnetization flip (50 K), despite the strong axial character of the Dy(III) ion.
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: Out-of-hospital cardiac arrest (OHCA) is a prominent cause of death worldwide. As indicated by the high proportion of COVID-19 suspicion or diagnosis among patients who had OHCA, this issue could have resulted in multiple fatalities from coronavirus disease 2019 (COVID-19) occurring at home and being counted as OHCA. : We used the MeSH term "heart arrest" as well as non-MeSH terms "out-of-hospital cardiac arrest, sudden cardiac death, OHCA, cardiac arrest, coronavirus pandemic, COVID-19, and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).

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Main-group organometallic compounds containing four-membered C^N chelating rings are being studied because of the interest in harnessing the enhanced reactivity of such compounds which arises as a result of the release of steric strain. In this article, we have reviewed the literature on these systems. This review is organised in terms of the types of ligand systems that allow the assembly of such compounds, .

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