One-dimensional (1D) coordination polymers, M(dhbq).nH2O (M= Mg, Mn, Co, Ni, and Zn, H2(dhbq) = 2,5-dihydroxy-1,4-benzoquinone, n = 2, 2.5, or 3), were synthesized and their structures were investigated using the Rietveld refinement method. They have 1D structure and were isostructural. From water uptake measurements, thermogravimetry, and elemental analysis, new 2.5 hydrate states were discovered. The proton conductivity of M(dhbq) was found to depend on the metal species and the quantity of absorbed water.
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