Synthesis, crystal structure and intermolecular magnetic interactions of a new N-TEMPO-3,5-di-tert-butylsalicylaldimine radical |
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Authors: | Veli T. Kasumov,Ibrahim Uç ar,Ahmet Bulut,Yusuf Yerli |
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Affiliation: | aDepartment of Chemistry, Harran University, Osmanbey, 63300 ?anl?urfa, Turkey;bDepartment of Physics, Ondokuz May?s University, 55139 Kurupelit, Samsun, Turkey;cDepartment of Physics, Gebze Institute of Technology, Gebze-Kocaeli, Turkey |
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Abstract: | A new N-TEMPO-3,5-di-tert-butylsalicylaldimine radical (1) has been synthesized and characterized by single crystal X-ray diffraction, elemental analysis, IR, UV–vis, and EPR spectroscopy and temperature dependent magnetic susceptibility. X-ray diffraction revealed that H-atoms of γ-CH in TEMPO and CH3 in salicylaldimine moieties, are located in close contact with the neighboring N–O radical group in crystal 1. The temperature dependence of the magnetic susceptibility (χm) of 1 has been fitted by the Curie–Weiss law with θ = −0.3 K within 10–300 K, suggesting the presence of a weak intermolecular antiferromagnetic interaction between radical centers at T < 10 K. It has been demonstrated that radical 1 possesses crystal structure involving co-existence of antiferromagnetic and ferromagnetic interactions through C–H?O–N contacts of γ-CH and tBu groups hydrogen atoms, in which the former path dominates over the latter. |
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Keywords: | N-TEMPO-3,5-di-tert-butylsalicylaldimine EPR Crystal structure Magnetism |
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