학술논문
Square versus tetrahedral iron clusters with polyoxometalate ligandsElectronic supplementary information (ESI) available: TGA curves and IR spectra for 1 and 2; crystal structures and magnetic data; Fig. SI1–SI4. See DOI: 10.1039/b714377j.
Document Type
Article
Source
Subject
*IONS
*SPECTRUM analysis
*ELECTRONS
*INTERMEDIATES (Chemistry)
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Language
ISSN
1477-9226
Abstract
Two new insoluble transition metal substituted phosphotungstates, (C2N2H10)11[{(B-α-PW9O34)Fe3(OH)3}4(PO4)4Fe]·38H2O (1) and K4(C2N2H10)12[(α-PW10Fe2O39)4]·30H2O (2), have been isolated by the hydrothermal reaction of [A-α-PW9O34]9−, FeIII ions and ethylenediamine. Compound 1 has a tetrahedral symmetry and contains a Fe13 core built from the assembly of four FeIII trisubstituted [B-α-PW9O34]9− anions around a central disordered iron ion via four phosphato ligands. The anion in 2 can be described as a square of disubstituted [PW10O37]9− anions linked by FeIII–O–FeIII bridges. Magnetic measurements performed on 1 and 2 have shown the occurrence of antiferromagnetic interactions between the iron ions and have allowed the coupling constants between the magnetic centers to be determined. [ABSTRACT FROM AUTHOR]