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| Titel: |
Three-dimensional 3d-4f hetero-bimetallic coordination polymers through hydrogen bonds: synthesis, structures and mossbauer spectrum analysis |
| Auteur: |
Li, Guangming Akitsu, Takashiro Sato, Osamu Einaga, Yasuaki |
| Verschenen in: |
Journal of coordination chemistry |
| Paginering: | Jaargang 57 (2004) nr. 10 pagina's 855-864 |
| Jaar: |
2004-07-10 |
| Inhoud: |
Four cyano-bridged 3d-4f hetero-bimetallic Ln(III)-Fe(III) assemblies, {[Ln(DMF)4(H2O)3(µ-CN)Fe(CN)5]· H2O}n (Ln = Ce (1), Nd (2), Sm (3) and Gd (4); DMF = N,N-dimethylformamide), have been synthesized. X-ray crystallographic analysis of both 3 and 4 reveals three-dimensional network structures resulting from hydrogen bonds in the crystals. With respect to the coordination number on Sm(III) atoms, 3 is different from previously reported structures. Structural comparison indicates that the differences in magnetic properties between 3 and 4 do not derive from structural factors. Mossbauer spectra at both 298 and 10 K reveal that the characteristic quadrupole splitting for low-spin Fe(III) ions (S = 1/2) remains unchanged, indicating that the spin state of Fe(III) ions in 1-4 is not affected by temperature. The magnetic anisotropy derived from the ground states of Ln(III) ions with odd 4fn electrons (n = 1, 3, 5 and 7), 2F5/2,4I9/2, 6H5/2 and 8S7/2 for Ce(III), Nd(III), Sm(III) and Gd(III), respectively, dominates the exchange interaction in the Ln(III)-NC-Fe(III) systems. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 84 van 86 gevonden artikelen
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