Details

Autor(en) / Beteiligte

• Parreiras, Júlia
• Faria, Erica N.
• Oliveira, Willian X. C.
• Do Pim, Walace D.
• Mambrini, Raquel V.
• Pedroso, Emerson F.
• Julve, Miguel
• Pereira, Cynthia L. M.
• Stumpf, Humberto O.

Titel

Solvent effects on the dimensionality of oxamato-bridged manganese(II) compounds

Ist Teil von

• Journal of coordination chemistry, 2018-03, Vol.71 (6), p.797-812

Ort / Verlag

Abingdon: Taylor & Francis Ltd

Erscheinungsjahr

2018

Quelle

Taylor & Francis

Beschreibungen/Notizen

• Two new oxamate-containing manganese(II) complexes, [{Mn(H2edpba)(H2O)2}2]n (1) and [Mn(H2edpba)(dmso)2]*dmso*CH3COCH3*H2O (2) (H4edpba = N,N[vprime]-ethylenediphenylenebis(oxamic acid) and dmso = dimethylsulfoxide), have been synthesized and the structures of 1 and 2 were characterized by single crystal X-ray diffraction. The structure of 1 consists of neutral honeycomb networks in which each manganese(II) is six-coordinate by one H2edpba2- ligand and two carboxylate-oxygens from two other H2edpba2- ligands building the equatorial plane. Each manganese is connected to its nearest neighbor through two carboxylate(monoprotonated oxamate) bridges in an anti-syn conformation. A dmso solution of single crystals of 1 was placed under acetone atmosphere affording 2, whereas putting 2 in equimolar water:ethanol mixture results in 1. The molecular structure of 2 is made up of mononuclear manganese(II) units which are interlinked by weak C-H...π and edge-to-face π-stacking interactions leading to supramolecular chains along the crystallographic b axis. Magnetic measurements reveal the occurrence of an antiferromagnetic coupling between two manganese(II) ions through anti-syn carboxylate bridges for 1 [J = -1.18 cm-1, the Hamiltonian being defined as H = -J S1.S2] and very weak intrachain ferromagnetic interactions in 2 [J = + 0.046 cm-1, H = -J ∑iSi.Si + 1].