6533b7cefe1ef96bd1257116
RESEARCH PRODUCT
Enhancement of the Intermolecular Magnetic Exchange through Halogen···Halogen interactions in Bisadeninium Rhenium(IV) Salts
Carlos Rojas-dottiNicolás MolinerJosé Martínez-lilloMiguel A. BarqueroDonatella ArmentanoEuan K. BrechinGiovanni De Munnosubject
010405 organic chemistryInorganic chemistryIntermolecular forcechemistry.chemical_elementGeneral ChemistryCrystal structureRhenium010402 general chemistryCondensed Matter Physics01 natural sciencesMagnetic susceptibility0104 chemical sciencesCrystallographychemistryOctahedral molecular geometryHalogenGeneral Materials ScienceOrthorhombic crystal systemIsostructuraldescription
Two novel ReIV salts of general formula [H2ade]2[ReIVX6]X2·4H2O [H2ade2+ = 9H-adenine-1,7-diium; X = Cl(1) and Br(2)] have been synthesized and magneto-structurally characterized. 1 and 2 are isostructural salts that crystallize in the orthorhombic system with space group Fdd2. Both compounds are made up of discrete mononuclear [ReIVX6]2- and X- anions and doubly protonated adenine cations. The six-coordinate rhenium(IV) ion is bonded to six halide ligands [X = Cl (1) and Br (2)] in an octahedral geometry. Short intermolecular ReIV−X···X−ReIV interactions, as well as ReIV−X···H−N(H2ade) and ReIV−X···H−Ow hydrogen bonds, are present in the crystal lattice of 1 and 2. Magnetic suscep-tibility measurements on polycrystalline samples of 1 and 2 in the temperature range 2.0-300 K show the occurrence of significant intermolecular antiferromagnetic interactions in both compounds, resulting in the observation of maxima in χM at ca. 6.0 (1) and 12.0 K (2). The larger spin delocalization from the ReIV ion onto their peripheral bromide ligands when compared to the chloride ligands accounts for the enhancement of the magnetic exchange observed in
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-09-25 |