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Two new coordination polymers of Robson-type macrocycle bridged by perchlorate anions: Structure,electrochemistry and magnetism
Authors:Jie Pan  Lei Cheng  Hong Zhou  Zhi-Quan Pan  Qi-Mao Huang  Xue-Lei Hu
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
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 = −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.
Keywords:Robson-type macrocyclic complex  Coordination polymer  Electrochemistry and magnetism
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