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Syntheses, crystal structures and magnetic properties of three cyanide-bridged iron(III)–manganese(II) binuclear complexes based on dicyanideferrite(III) building blocks

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Abstract

Three cyanide-bridged FeIII–MnII binuclear complexes [Mn(phen)2Cl][Fe(bpmb)(CN)2]·H2O (1), [Mn(phen)2Cl][Fe(bpdmb)(CN)2]·H2O (2) and [Mn(phen)2Cl][Fe(bpClb)(CN)2]·3H2O·EtOH (3) [phen = 1,10-phenanthroline, bpmb2− = 1,2-bis(pyridine-2-carboxamido)-4-methyl-benzenate, bpdmb2− = 1,2-bis(pyridine-2-carboxamido)-4,5-dimethyl-benzenate, bpClb2− = 1,2-bis(pyridine-2-carboxamido)-4-chloro-benzenate)] have been synthesized by the reaction of Mn(phen)2Cl2 with K[Fe(L)(CN)2]. The syntheses, crystal structures and magnetic properties of the complexes have been investigated. Single-crystal X-ray diffraction analysis reveals that all three complexes are binuclear complexes and contain FeIII–C≡N–MnII linkages. Magnetic investigations indicate antiferromagnetic coupling between low-spin Fe(III) and high-spin Mn(II) centers through cyanide bridging, with J MnFe = −1.39(5) cm−1 for 1, J MnFe = −3.33(2) cm−1 for 2 and J MnFe = −1.96(5) cm−1 for 3. The magneto-structural relationships for cyanide-bridged FeIII–MnII systems are discussed based on binuclear FeIII–MnII and trinuclear FeIII–MnII–FeIII magnetic models.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 21176246), the Priority Academic Program Development of Jiangsu Higher Education Institutions and the Fundamental Research Funds for the Central Universities (China University of Mining and Technology).

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, People’s Republic of China

    Guo-Ling Li, Wei-Qin Cheng, Li-Fang Zhang & Zhong-Hai Ni

  2. Department of Chemistry, Tsinghua University, Beijing, 100084, People’s Republic of China

    Ming-Ming Yu & Hui-Zhong Kou

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  1. Guo-Ling Li
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  2. Wei-Qin Cheng
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  3. Li-Fang Zhang
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  4. Zhong-Hai Ni
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Correspondence to Zhong-Hai Ni or Hui-Zhong Kou.

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Li, GL., Cheng, WQ., Zhang, LF. et al. Syntheses, crystal structures and magnetic properties of three cyanide-bridged iron(III)–manganese(II) binuclear complexes based on dicyanideferrite(III) building blocks. Transition Met Chem 37, 469–474 (2012). https://doi.org/10.1007/s11243-012-9611-6

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