Magnetism in organic radical ion salts based on nitronyl nitroxide derivatives substituted with heterocyclic aromatic hydrocarbons |
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| Affiliation: | 1. Department of Chemistry, Meiji Gakuin University, Kamikurata, Totsuka-ku, Yokohama 244-8539, Japan;2. Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK;3. Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, UK;1. Department of Chemistry, University of Kalyani, Kalyani, West Bengal 741235, India;2. Department of Chemical Sciences, Indian Institute of Science Education & Research Kolkata, Mohanpur, West Bengal 741246, India;3. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India;4. Institut fur Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universitat Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany;1. Department of Chemistry, Panjab University, India;2. Department of Microbiology, Panjab University, Chandigarh 160014, India;3. Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand;1. MINOS-EMaS, Universitat Rovira i Virgili, Avda. Països Catalans 26, 43007 Tarragona, Spain;2. Central European Institute of Technology (CEITEC), Brno University of Technology, Technická 10, 616 00 Brno, Czech Republic;3. Scientific Service, Universitat Rovira i Virgil, Avda. Països Catalans 26, 43007 Tarragona, Spain;4. Division of Materials Chemistry, Faculty of Engineering, Hokkaido University, N-13, W-8, Sapporo 060-8628, Japan;1. Department of Electronics & Communication Engineering, North China Electric Power University, Baoding 071003, Hebei Province, China;2. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, Baoding 071003, China;1. Department of Chemistry, Faculty of Sciences, Shahid Chamran University of Ahvaz, Ahvaz, Iran;2. Dipartimento di Chimica Inorganica, Vill. S. Agata, Salita Sperone 31, Università di Messina, 98166 Messina, Italy;3. Faculty of Chemistry, University of Isfahan, Isfahan 81746-73441, Iran |
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| Abstract: | Radical cation and anion salts of the neutral organic radicals, 2-imidazolyl nitronyl nitroxide (2-IMNN) and 2-benzimidazolyl nitronyl nitroxide (2-BIMNN), have been prepared and their magnetic properties studied by SQUID magnetometry. The radical salts exhibit one-dimensional (1-d) antiferromagnetic (AFM) intermolecular interactions with the exchange coupling J/k between −0.8 and −6.3 K, which are significantly reduced from those observed in the two neutral radicals, while 2-IMNN shows an AFM interaction with J/k=−88 K within the molecular dimers and 2-BIMNN has quasi 1-d ferromagnetic (FM) intermolecular interactions with J/k=+22 K (intrachain) and zJ′/k=+0.24 K (interchain). The magnetic properties of the nitronyl nitroxide and iminonitroxide derivatives having molecular structure related to 2-IMNN have also been investigated. In 2-benzimidazolyl iminonitroxide (2-BIMIN), the FM interaction observed in 2-BIMNN is replaced by strong 1-d AFM interaction with J/k=−11.7 K. |
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