Two new coordination polymers of Robson-type macrocycle bridged by perchlorate anions: Structure,electrochemistry and magnetism |
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Authors: | Jie Pan Lei Cheng Hong Zhou Zhi-Quan Pan Qi-Mao Huang Xue-Lei Hu |
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Institution: | 1. Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, Wuhan 430073, China;2. State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China |
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Abstract: | Two new coordination polymers of Robson-type macrocycles, Cu2L1(μ-ClO4)2]∞ (1) and Cu2L2(μ-ClO4)2]∞ (2) (where H2L1and H2L2 are the 2+2] condensation products of 2,6-diformyl-4-flurophenol with 1,3-diaminopropane and 2-hydroxy-1,3-diaminopropane, respectively), have been synthesized and characterized. The intriguing feature is that intermolecular perchlorato bridges occur between adjacent copper(II) centers. The cyclic voltammograms of the complexes show that each complex undergoes two pseudo-reversible processes with the half wave potentials, −0.361 V and −0.729 V for 1, and −0.372 V and −0.744 V for 2, respectively. Magnetic susceptibility was measured for 1 and 2 over a temperature range of 2–300 K. The optimized magnetic data were J = −359.6 cm−1, j′ = −30 cm−1 and R = 6.8 × 10−8 for 1 and J = −411 cm−1, j′ = −26 cm−1 and R = 2.4 × 10−7 for 2, respectively. The data reveal antiferromagnetic couplings between the copper(II) ions of intra- and intermolecular units. |
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Keywords: | Robson-type macrocyclic complex Coordination polymer Electrochemistry and magnetism |
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