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

Abstract

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, μ3-η2:η1 and μ2-η1:η1 carboxyl groups from 1,4-ndc2– groups as well as coordination water molecules. In compound 2, MnII ions are connected by μ4-η1:η1:η1:η1 1,4-ndc2– groups and μ2-η1:η1 acetate radicals, forming a 3D framework. For compound 3, a [Co3(CO2)4(H2O)4] unit is observed, which is further bridged by μ2-η1:η0:η1:η0 and μ4-η1:η1:η1:η1 1,4-ndc2– groups and ultimately results in forming a 3D structure. It demonstrates compounds 1–3 can be noted as pcu, l...