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NiII, MnII, and CoII Coordination Polymers with 1,4-Naphthalenedicarboxylic Acid Exhibiting Metamagnetic and Antiferromagnetic Behaviors

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journal contribution
posted on 23.10.2018, 00:00 by Ya-Min Li, Xue-Fei Li, Ying-Ying Wu, Daniel L. Collins-Wildman, Sheng-Min Hu, Ying Liu, Hai-Yan Li, Xiao-Wei Zhao, Lin-Yu Jin, Dong-Bin Dang
Three novel compounds, [Ni4(1,4-ndc)3­(OH)2(H2O)2­·2.5H2O]n (1), {[Mn2(1,4-ndc)2­(OAc)]­(C5MIm)­·0.5H2O}n (2), and {[Co3(1,4-ndc)4­(H2O)4]­(C5MIm)2­·2H2O}n (3), were hydro-/solvothermally prepared with the corresponding acetate, 1,4-H2ndc (1,4-H2ndc = 1,4-naphthalenedicarboxylic acid) and different auxiliaries such as C5MImBr (C5MImBr = 1-pentyl-3-methylimidazolium bromide) or 2,4-diamino-6-methyl-1,3,5-triazine. Compound 1 composes of one three-dimensional (3D) network, where one rare nickel chain is constructed through NiII ions bridged by μ3-OH groups, μ321 and μ211 carboxyl groups from 1,4-ndc2– groups as well as coordination water molecules. In compound 2, MnII ions are connected by μ41111 1,4-ndc2– groups and μ211 acetate radicals, forming a 3D framework. For compound 3, a [Co3(CO2)4­(H2O)4] unit is observed, which is further bridged by μ21010 and μ41111 1,4-ndc2– groups and ultimately results in forming a 3D structure. It demonstrates compounds 13 can be noted as pcu, lon, and the highly connected bcu topologies by topology analysis, respectively. A thorough magnetic study of 1 reveals the metamagnetic behavior, mainly resulting from the unique one-dimensional NiII chain. Comparatively, magnetic analyses of 2 and 3 suggest the presence of the antiferromagnetic interactions with the best fitting magnetic susceptibility data for 2 (J = −0.85 cm–1 and g = 2.1) at 10–300 K.