Molecular spin ladders self-assembly from [Ni(dmit)2]? building blocks: Syntheses,structures and magnetic properties |
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| Institution: | 1. Chemistry Department, Anqing Normal College, Lin Hu South Road 128, Anqing 246011, PR China;2. Coordination Chemistry Institute & State Key Laboratory, Nanjing University, Nanjing 210093, PR China;1. College of Materials Science and Engineering, Key Laboratory of Polymeric Composition and Modification, Qiqihar University, Wenhua Street 42, Qiqihar 161006, China;2. Graduate School of Science and Technology, Niigata University, 2-8050 Ikarashi, Nishi-ku, Niigata 950-2181, Japan;3. Polymer Materials Research Center, Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, PA 15261, United States;2. Materials Research Institute, the Pennsylvania State University, University Park, PA 16802, United States;1. Graduate School & Faculty of Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan;2. Graduate School, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan;3. School of Materials Science and Engineering, Xihua University, No. 99 Jinzhou Road, Chengdu, Sichuan, 610039, China;4. Chiba Industrial Technology Research Institute, 6-13-1, Tendai, Inage-ku, Chiba, 263-0016, Japan;1. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran;2. Alikhanyan National Science Laboratory, Alikhanian Br. 2, 0036 Yerevan, Armenia;1. National Research Center “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute, Gatchina 188300, Russia;2. St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia |
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| Abstract: | Two ion-pair compounds, consisting of 1-(4′-R-benzyl)pyridinium (RBzPy]+, R = NO2 (1) and Br (2)) and Ni(dmit)2]? (dmit2? = 2-thioxo-1,3-dithion-4,5-dithiolato), have been synthesized and structurally characterized. The anions of Ni(dmit)2]? stack into dimers, which further construct into two-leg ladder through terminal S?S interactions in 1, lateral S?S interactions in 2. The weak H-bonding interactions of C–H?S were observed in 2, while only weak van de Waals interactions between anion and cations in 1. The magnetic susceptibilities measured in 2–300 K indicate AFM exchange interaction domination both two compounds. A peculiar magnetic transition at ～100 K was observed in 1. An AFM ordering below ～11 K was found in 2, and the best fit to magnetic susceptibility above 45 K in this compound, using a dimer model with s = 1/2, give rise to Δ/kB = 36.1 K, zJ = ?0.91 K, C = 3.2 × 10?3 emu K mol?1 and χ0 = ?4.0 × 10?6 emu mol?1 with g of 2.0 fixed. |
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