6533b870fe1ef96bd12cefea

RESEARCH PRODUCT

Co-crystallization of Keggin type polyoxometalates [HL]3[PW12O40] and [Ln(DMF)8][PW12O40] (Ln=La, Dy, Yb) (L=N-(2-hydroxyphenyl)-3-methoxy-salicylideneamine): Syntheses, structures and magnetic properties

Klaus HarmsSudeshna SahaCarlos J. Gómez-garcíaPartha P. JanaHari Pada Nayek

subject

LanthanideSchiff base010405 organic chemistryLigandInorganic chemistryProtonationCrystal structure010402 general chemistry01 natural sciences0104 chemical sciencesInorganic Chemistrychemistry.chemical_compoundCrystallographychemistryPolyoxometalateMaterials ChemistryDimethylformamidePhosphotungstic acidPhysical and Theoretical Chemistry

description

Abstract Four new Keggin type polyoxometalate clusters [HL]3[PW12O40]·5MeOH (1) and [Ln(DMF)8][PW12O40] {Ln = La (2), Dy (3), Yb (4)} (L = N-(2-hydroxyphenyl)-3-methoxy-salicylideneamine) have been synthesized. Co-crystallization of complex 1 with each of the three complexes 2–4 takes place when the Schiff base ligand is treated with hydrated phosphotungstic acid, H3[PW12O40]·xH2O, hydrated lanthanide nitrate, Ln(NO3)3·6H2O in the presence of Ni(NO3)2·6H2O. The Schiff base ligand is protonated in complex 1 and thus it is neutralizing the charge of the polyoxotungstate anion, [PW12O40]3−. A dimethylformamide (DMF) coordinated trivalent lanthanide ion balances the negative charge of the polyoxoanion in 2–4. All complexes are characterized by several standard analytical techniques. Solid state molecular structures of 1–4 were confirmed by single crystal X-ray diffraction analyses. The magnetic properties of complexes 3 and 4 confirm the presence of monomeric Dy(III) and Yb(III) complexes with a thermal depopulation of the highest energy Stark levels as the temperature is decreased.

yearjournalcountryeditionlanguage
2016-01-01Polyhedron
https://doi.org/10.1016/j.poly.2015.11.035