Two organic–inorganic hybrid polyoxotungstogermanates containing organic ligand chelated Fe–Dy heterometallic clusters and frequency dependent magnetic properties

Abstract

Two organic–inorganic hybrid polyoxotungstogermanates, HK₇(H₂O)₆(C₆H₁₆N₂)₆-[Fe(C₆H₁₄N₂)Dy(H₂O)₂Fe₂(B-α-GeW₉O₃₄)(GeW₇O₂₉)]₂·14H₂O (1) and (Hphen)₂[Fe(phen)₃]₂[Dy(phen)Fe(B-α-GeW₉O₃₄)]₂ (2) (C₆H₁₄N₂ = trans-1,2-cyclohexanediamine, phen = 1,10-phenanthroline), containing organic ligand chelated Fe–Dy heterometallic clusters have been successfully synthesized under hydrothermal conditions. Compound 1 contains a cable-like structural fragment which consists of a centrosymmetric “S”-shaped K₇O₁₄ cluster and a centrosymmetric “S”-shaped organic ligand chelated Fe–Dy heterometallic cluster substituted tungstogermanate, {[Fe(C₆H₁₄N₂)Dy(H₂O)₂Fe₂(B-α-GeW₉O₃₄)(GeW₇O₂₉)]₂}²⁰⁻. Compound 2 possesses a sandwich structure which contains two trilacunary [B-α-GeW₉O₃₄]¹⁰⁻ units and one {(phen)DyFeO₆}₂ cluster in the middle layer. Both compounds have magnetic properties, with compound 1 having frequency dependent magnetic properties.