Artículos de revistas
Layered vanadyl (IV) nitroprusside: Magnetic interaction through a network of hydrogen bonds
Fecha
2016-04Registro en:
Gil, Diego Mauricio; Osiry, Hernández; Pomiro, Fernando; Varetti, Eduardo Lelio; Carbonio, Raul Ernesto; et al.; Layered vanadyl (IV) nitroprusside: Magnetic interaction through a network of hydrogen bonds; Elsevier Inc; Journal of Solid State Chemistry; 239; 4-2016; 159-164
0022-4596
CONICET Digital
CONICET
Autor
Gil, Diego Mauricio
Osiry, Hernández
Pomiro, Fernando
Varetti, Eduardo Lelio
Carbonio, Raul Ernesto
Alejandro, R. R.
Ben Altabef, Aída
Reguera, Edilso
Resumen
The hydrogen bond and π-π stacking are two non-covalent interactions able to support cooperative magnetic ordering between paramagnetic centers. This contribution reports the crystal structure and related magnetic properties for VO[Fe(CN)5NO]·2H2O, which has a layered structure. This solid crystallizes with an orthorhombic unit cell, in the Pna21 space group, with cell parameters a=14.1804(2), b=10.4935(1), c=7.1722(8) Å and four molecules per unit cell (Z=4). Its crystal structure was solved and refined from powder X-ray diffraction data. Neighboring layers remain linked through a network of hydrogen bonds involving a water molecule coordinated to the axial position for the V atom and the unbridged axial NO and CN ligands. An uncoordinated water molecule is found forming a triple bridge between these last two ligands and the coordinated water molecule. The magnetic measurements, recorded down to 2 K, shows a ferromagnetic interaction between V atoms located at neighboring layers, with a Curie-Weiss constant of 3.14 K. Such ferromagnetic behavior was interpreted as resulting from a superexchange interaction through the network of strong OH····OH2O, OH····NCN, and OH····ONO hydrogen bonds that connects neighboring layers. The interaction within the layer must be of antiferromagnetic nature and it was detected close to 2 K.