期刊
RSC ADVANCES
卷 6, 期 46, 页码 39627-39635出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra05342d
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资金
- Spanish Ministerio de Economia y Competitividad (MINECO)
- FEDER funds [CTQ2013-46275-P]
- Unidad de Excelencia Maria de Maeztu [MDM-2015-0538]
- Generalitat Valenciana [PROMETEO/2012/049]
- EU [IIF-253254]
A series of spin transition neutral compounds [FeL(NCS)(2)] has been synthesized and characterized by means of magnetic susceptibility studies, X-ray diffraction, IR and Mossbauer spectroscopic, and calorimetric measurements (L = N,N-bis((3-alkoxypyridin-2-yl)methylene)-propane-1,3-diamine, number of carbon atoms in chains (n) = 4, 12, 14, 16, 18, 20). The shortest chain compound is crystalline and displays a gradual spin transition above ambient temperature. Growing the aliphatic substituent up to n = 12 and 14 leads to loss of crystalline order and deterioration of magnetic properties. At the critical chain length n = 16 and above, the compounds undergo a phase transition reflected by a spin transition and resulting in the appearance of susceptibility hysteresis initially not observed for the short chain congener. For the compound with n = 20, hysteresis becomes the most pronounced. The study shows the importance of chain length optimization for effective feedback between phase and spin transitions.
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