Imparting hysteretic behavior to spin transition in neutral mononuclear complexes

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 Mössbauer spectroscopic, and calorimetric measurements (L = N , N -bis((3-alkoxypyridin-2-yl)methylene)-propane-1,3-diamine, numbe...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (46), p.39627-39635
Main Authors: Seredyuk, Maksym, Znovjyak, Kateryna, Muñoz, M. Carmen, Galyametdinov, Yurii, Fritsky, Igor O, Real, Jose A
Format: Article
Language:English
Subjects:
Atomic beam spectroscopy
Calorimetry
Carbon
Crystal structure
Hysteresis
Magnetic permeability
Phase transformations
Spin transition
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Summary: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 Mössbauer 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. The paper presents an experimental study of spin transition thiocyanate complexes of Fe( ii ) with aliphatic substituents with focus on the interaction between spin- and phase-transitions.
ISSN:2046-2069
2046-2069
DOI:10.1039/c6ra05342d