期刊
CHEMPHYSCHEM
卷 12, 期 2, 页码 405-410出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201000428
关键词
bis-terpyridine ligands; iron(II) complexes; molecular magnetism; spin crossover; X-ray absorption spectroscopy
资金
- Deutsche Forschungsgemeinschaft DFG [SPP1137]
X-ray absorption near the iron K edge (XANES) was used to investigate the characteristics of temperature-induced low-spin-to-high-spin change (SC) in metallo-supramolecular polyelectrolyte amphiphile complexes (PAC) containing FeN6 octahedra attached to two or six amphiphilic molecules. Compared to the typical spin-crossover material Fe(phen)(2)(NCS)(2) XANES spectra of PAC show fingerprint features restricted to the near-edge region which mainly measures multiple scattering (MS) events. The changes of the XANES profiles during SC are thus attributed to the structure changes due to different MS path lengths. Our results can be interpreted by a uniaxial deformation of FeN6 octahedra in PAC. This is in agreement with the prediction that SC is originated by a structural phase transition in the amphiphilic matrix of PAC, but in contrast to Fe(phen)(2)(NCS)(2), showing the typical spin crossover being associated with shortening of all the metal-ligand distances.
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