Layeredvanadyl(IV)nitroprusside:Magneticinteractionthrougha networkofhydrogenbonds

D. M. GIL; H. OSIRY; F. POMIRIO; E. L. VARETTI; R. E. CARBONIO; R. R. ALEJANDRO; A. BEN ALTABEF; E. REGUERA

JOURNAL OF SOLID STATE CHEMISTRY

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: Amsterdam; Año: 2016 vol. 239 p. 159 - 164

0022-4596

magnetic orderingbetweenparamagneticcenters.ThiscontributionreportsthecrystalstructureandrelatedmagneticpropertiesforVO[Fe(CN)5NO] 2H2O, whichhasalayeredstructure.Thissolidcrys-tallizes withanorthorhombicunitcell,inthe Pna21 space group,withcellparameters a¼14.1804(2),b¼10.4935(1), c¼7.1722(8)Åandfourmoleculesperunitcell(Z¼4). Itscrystalstructurewassolvedandrefined frompowderX-raydiffractiondata.NeighboringlayersremainlinkedthroughanetworkofhydrogenbondsinvolvingawatermoleculecoordinatedtotheaxialpositionfortheVatomandtheunbridged axialNOandCNligands.Anuncoordinatedwatermoleculeisfoundformingatriplebridgebetween theselasttwoligandsandthecoordinatedwatermolecule.Themagneticmeasurements,re-corded downto2K,showsaferromagneticinteractionbetweenVatomslocatedatneighboringlayers,with aCurie-Weissconstantof3.14K.SuchferromagneticbehaviorwasinterpretedasresultingfromasuperexchangeinteractionthroughthenetworkofstrongOH OH2O, OH NCN, andOH ONOhydrogenbondsthatconnectsneighboringlayers.Theinteractionwithinthelayermustbeofanti-ferromagnetic natureanditwasdetectedcloseto2K.