Magnetic-, ESR and Quantumchemical Investigations on Penta- and Hexa- Coordinated Manganese (II) Complexes

Two manganese(II) complexes with the tridentate ligand 2,6-bis(benzimidazol-2-yl)pyridine, namely $[Mn(bzimpy)_2](ClO_4)_2$, 1, and $[Mn(bzimpy)Cl_2]$ * 0.5MeOH, 2, have been investigated by magnetic AC susceptibility measurements in the temperature range of 18 to 300 K. Electron spin resonance has been performed in solid state and frozen solution at 77 K. Parameters for the magnetic contributions to the Hamiltonian received by these techniques confirm axial magnetic anisotropy. ACS data are: $g_av = 1.92±0.04$, $|D/hc| = 0.9±1.3 cm^-1$ and $g_av = 1.89$, $|D/hc| = 1.4 cm^-1$ for 1, and 2, respectively. The three found ESR resonances correspond to $g_eff^(1) = 1.99$, $g_eff^(2) = 3.3$ and $g_eff^(3) = 4.3$. The highest field resonance exhibits a hyperfine sextet splitting of $|A_av/hcl| = 92 x 10^-4 cm^-1$ for both complexes. Well resolved forbidden transitions allow for an estimation of the zero-field splitting parameter being $D/hc = -0.09 and 0.13 cm^-1$ for the two complexes, respectively. $Ab$ $initio$ MO-LCAO-SCF calculations on a double-zeta basis set indicate that complex 2 should be more stable than $1$. The calculations yielded also information about electronic structure, bond-strenghts and charge distributions within the complexes

Structural, Magnetic, and Electrochemical Characterization of Iron(III) and Cobalt Complexes with Penta-N3O2-dentate Ligands

Six new mononuclear [FeIII(LBr,Cl)X]-complexes (LBr,Cl is the dianionic penta-N3O2-dentate Schiff base ligand N,N′-bis(2’-hydroxy-3-bromo-5-chlorobenzylidene)-1,6-diamino-3-azahexane; X: Cl−, N3−, NCO−, NCS−, NCSe−, CN−) were synthesized and their structures, magnetic and electrochemical properties studied. Structure analysis and magnetic measurements showed that [FeIII(LBr,Cl)CN] is in the low spin state and the other five complexes are in high spin states. Furthermore, the trinuclear mixed valent cobalt complex {[CoIII(LH,H)CN]2[CoII(1-methylimidazole)3(H2O)]} was prepared and its magnetic behavior studied. © 2021 The Authors. European Journal of Inorganic Chemistry published by Wiley-VCH Gmb

Production of He-4 and (4) in Pb-Pb collisions at root(NN)-N-S=2.76 TeV at the LHC

Results on the production of He-4 and (4) nuclei in Pb-Pb collisions at root(NN)-N-S = 2.76 TeV in the rapidity range vertical bar y vertical bar <1, using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0-10% central events are found to be dN/dy4(He) = (0.8 +/- 0.4 (stat) +/- 0.3 (syst)) x 10(-6) and dN/dy4 = (1.1 +/- 0.4 (stat) +/- 0.2 (syst)) x 10(-6), respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature (T-chem = 156 MeV) as for light hadrons. The measured ratio of (4)/He-4 is 1.4 +/- 0.8 (stat) +/- 0.5 (syst). (C) 2018 Published by Elsevier B.V.Peer reviewe