研究目的
Investigating the soft X-ray–induced excited spin state trapping (SOXEISST) effect in Hofmann-like SCO coordination polymers of FeII(4-methylpyrimidine)2[Au(CN)2]2 and FeII(pyridine)2[Ni(CN)4].
研究成果
Results of soft XAS on Hofmann-like FeII(4-methylpyrimidine)2[Au(CN)2]2 and FeII(pyridine)2[Ni(CN)4] polymers showed that the high spin configuration prevailed even at temperatures far below the TC’s, suggesting that the SOXIESST effects were activated to suppress the SCO effects. This was in contrast to the reference Fe(phen)2(NCS)2 complex, in which a clear SCO was observed by soft XAS.
研究不足
The intensity of the soft X-rays was not high enough to evoke a SOXIESST effect in the reference Fe(phen)2(NCS)2 powder. The powders are distributed sparsely so that the actual intensity of the beam shed on the SCO complex should be much weaker than the nominal value.
1：Experimental Design and Method Selection:
Soft X-ray absorption spectroscopy (XAS) was performed to examine the possible SOXIESST effects in the loosely coordinated Fe2+ ions in the polymeric structures.
2：Sample Selection and Data Sources:
Fe(4-methylpmd)2[Au(CN)2]2, Fe(py)2[Ni(CN)4] and Fe(phen)2(NCS)2 powders were synthesized by the vapor diffusion methods.
3：List of Experimental Equipment and Materials:
CHN CORDER JM10 for elemental analysis, JASCO FTIR-4100 spectrometer for IR spectra, Rigaku RINT2500 diffractometer for powder XRD, TG/DTA6200 for thermogravimetric analysis, MPMS-XL Quantum Design SQUID magnetometer for magnetic susceptibility measurement.
4：Experimental Procedures and Operational Workflow:
The compositions and structures of the three powder samples were identified by elemental analysis, powder XRD, and IR spectroscopy. Magnetic susceptibility was measured in the temperature range of 4–300 K. Fe L2,3-edge XAS was performed at 2 A beamline in Pohang Light Source.
5：Data Analysis Methods:
The lineshapes of the spectra were interpreted as the fingerprints of the HS Fe2+ and LS Fe2+ under octahedral ligand fields.
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