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Synthesis, crystal structure and magnetic properties of an alternating manganes...
Silva, Manuela Ramos; Beja, Ana Matos; Paixão, José António; Martín-Gil, JesusA new 1D complex has been prepared and characterized. X-ray single crystal structure confirms that the Mn(II) ions assemble in alternating chains with Mn-Mn distances of 3.8432(13) and 4.4428(14) Å. A 3D network of hydrogen bonds links the chains together. The temperature dependence of the magnetic susceptibility reveals that this compound undergoes a magnetic transition and exhibits an antiferromagnetic intera...
Crystal structure and properties of l-tryptophanium hydrogen selenite
Paixão, José António; Silva, Manuela Ramos; Beja, Ana Matos; Eusébio, Ermelindal-Tryptophanium hydrogen selenite was synthesised and structurally characterised at room and low temperature. The aminoacid is positively charged with the amine and carboxylic group protonated. It adopts a staggered conformation with the N1 gauche to C4 that is gauche to C1. The anion displays a pyramidal conformation with three different Se-O bond lengths, one characteristic of a double bond, another of a sing...
(R,R)-N-phenyl-3,4-bis(diphenylphosphino)pyrrolidine: an N-aryl pyrrolidine lig...
Gonsalves, António Manuel d'Albuquerque Rocha; Serra, Maria Elisa da Silva; Silva, Manuela Ramos; Beja, Ana Matos; Paixão, José AntónioThe N-aryl pyrrolidine diphosphine (R,R)-N-phenyl-3,4-bis(diphenylphosphino)pyrrolidine was obtained from natural tartaric acid. Contrary to our preliminary expectations, this new chiral ligand proved to be less selective than the corresponding N-benzyl pyrrolidine diphosphine. An attempted explanation of the observed behaviour based on the stereochemistry of the ligand as shown by X-ray crystallography is pres...
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