Magnetostructural Studies on Tetranuclear Manganese [Mn III 2 Mn II 2 ] Complexes of 9-Hydroxyphenalenone with Weak π···π Interactions

International audienc

Influence of Solvent in Solvothermal Syntheses: Change of Nuclearity in Mixed Valence Co^II/III Complexes of a O‑Donor-rich Schiff Base Ligand

We have found that a change of solvent in a solvothermal synthetic method may be a useful tool to generate complexes of various nuclearities keeping the reactants, synthetic conditions, and stoichiometry the same. Although the process involves serendipity, the potential of producing change in nuclearity of discrete molecular complexes by mere change of solvent ratios provides an additional scope to tune nuclearity using the same precursors. The above methodology led us to generate three complexes of different nuclearity bearing the formula [Co^IICo^III­(H₂L)₂(OAc)]­·2CH₃OH­·H₂O (<b>1</b>), [Co^II₃ Co^III₃­(HL)₂(H₂L)₂­(OAc)₂ ]­·9CH₃OH·H₂O (<b>3</b>), [Co^II₅Co^III₄­(HL)₄(H₂L)₄(Cl)₂]­·4H₂O (<b>4</b>) [where, H₄L = 2-(3,5-di-<i>ter</i>t-butyl-2-hydroxybenzylideneamino)-2-(hydroxymethyl)­propane-1,3-diol]. Using the same reactants, stoichiometry, and solvent used to generate <b>3</b> (in solvothermal method) if we reflux on the benchtop we get the dinuclear complex <b>1</b>, but on addition of 3,5-dimethylpyrazole a tetranuclear Co^II/III complex [Co^II₂Co^III₂­(HL)₂(OAc)₂­(CH₃OH)₂(DMP)₂]­·CH₃COOH·H₂O (<b>2</b>) is obtained. All the complexes were characterized by various spectroscopic and analytical methods including single crystal X-ray crystallography. The temperature dependence of magnetic susceptibility of <b>3</b> and <b>4</b> show that the Co^II centers are weakly coupled within a single molecule and exhibit both ferro- and antiferromagnetic interactions. <b>3</b> was found to be active in conversion of 3,5-di-<i>tert</i>-butylcatechol to 3,5-di-<i>tert</i>-butylbenzoquinone and produces hydrogen peroxide

Measurement of charged particle spectra in minimum-bias events from proton-proton collisions at root s =13 TeV

Pseudorapidity, transverse momentum, and multiplicity distributions are measured in the pseudorapidity range vertical bar eta vertical bar 0.5 GeV in proton-proton collisions at a center-of-mass energy of root s = 13 TeV. Measurements are presented in three different event categories. The most inclusive of the categories corresponds to an inelastic pp data set, while the other two categories are exclusive subsets of the inelastic sample that are either enhanced or depleted in single diffractive dissociation events. The measurements are compared to predictions from Monte Carlo event generators used to describe high-energy hadronic interactions in collider and cosmic-ray physics.Peer reviewe

Abstracts of National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020

This book presents the abstracts of the papers presented to the Online National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020 (RDMPMC-2020) held on 26th and 27th August 2020 organized by the Department of Metallurgical and Materials Science in Association with the Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, India. Conference Title: National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020Conference Acronym: RDMPMC-2020Conference Date: 26–27 August 2020Conference Location: Online (Virtual Mode)Conference Organizer: Department of Metallurgical and Materials Engineering, National Institute of Technology JamshedpurCo-organizer: Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, IndiaConference Sponsor: TEQIP-