کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1340106 | 1500294 | 2007 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Unprecedented multistability in dodecanuclear complex compound observed by Mössbauer spectroscopy Unprecedented multistability in dodecanuclear complex compound observed by Mössbauer spectroscopy](/preview/png/1340106.png)
The precursors [Fe(III)(5XL)Cl] (5XLH2 = N,N′-bis(1-hydroxy-2-benzyliden)-1,6-diamino-3-X-hexane, X = N,S) are high-spin (S = 5/2) complexes. This precursors are combined with the bridging unit [(NC)5Fe(II)-CN-Co(III)(CN)5]6− to yield star-shaped dodecanuclear clusters, [(5XLFe(III)-NC)5Fe(II)-CN-Co(III)(CN-Fe(III)5XL)5]Cl4. The star-shaped compounds are high-spin systems at room temperature. On cooling to 20 K some of the iron(III) centers in the N-star switch to the low-spin state as proven by Mössbauer spectroscopy, i.e. multiple electronic transitions, while the S-star remains in the high-spin state.
The pentadentate ligand precursors [Fe(III)LCl] yield in synthesis with the bridging unit [(NC)5Fe(II)-CN-Co(III)(CN)5]6− a star-shaped dodecanuclear compound. They are high-spin systems with 50 unpaired electrons at room temperature. Some of them change sequentially between multiple electronical states on cooling while light irradiation favours a concerted reaction mechanism.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 26, Issues 9–11, 15 June 2007, Pages 2325–2329