by Yashiro Rojas  , Evana Halaka  , Mary Hanna  , Alex Sidotu  , Jehan Joma  , Mina Mikhael  , Roger A. Lalancette  and Ivan Bernal

Received: 26 July 2020;  Published: 07 September 2020;  doi: 10.21926/acr.2003008

The compound, [cis-dichloro-(tris-2-amino(ethylamine))cobalt(III)]chloride hydrate, [cis-Cl2-(tren)Co(III)Cl]·H2O, a conglomerate crystallizing in P21 with Z = 4 (Z’ = 2), has been used as a precursor in the synthesis of a new dicobalt(III) peroxo complex: [(μ2-hydroxo)(μ2-peroxo)bis(tris-2-amino(ethylamine))di-cobalt(III)] tris(triiodide) dihydrate. This material crystallizes, without disorder, in space group P212121 with Z = 4 (Z’ = 2), thus making it, unambiguously, an example of a conglomera [...]

by Marek Łożyński  , Iwona Mądrzak-Litwa  and Aleksandra Borowiak-Resterna

Received: 29 June 2020;  Published: 27 August 2020;  doi: 10.21926/acr.2003007

1-Decylbenzimidazole (dbim) copper(II) complexes formed during solvent extraction were thoroughly studied, and their structures were predicted. Density functional theory (DFT) calculations of their structures and Time-dependent DFT (TD-DFT) calculations of their spectra indicated that 1-decylbenzimidazole forms both mono- and binuclear complexes with copper(II), with coordination numbers of 4 or 5. At the molar ratio of [Cu(II)]aq/[dbim]org ≥ 1 and at [Cl-]aq ≥ 0.9 mol dm-3 in the extraction med [...]

by Sandra Mikhael  , Maria Shawky  , Gulraiz Hashmi  , Ivan Bernal  and Roger A. Lalancette

Received: 28 June 2020;  Published: 23 July 2020;  doi: 10.21926/acr.2003006

It is historically interesting to note that, whereas the [Co(NH₃)₆]³⁺ cation was isolated by Tassaert in 1798 (which he described as the tri-chloride) and that, in the early days of Coordination Chemistry, Jørgensen and Werner isolated many of its other salts, the fluoride was never reported. In fact, in relatively modern times, lack of success was, invariably, the result of attempting its isolation and full characterization. S [...]