Structures and Proton Conductivity of One-Dimensional M(dhbq)•nH2O (M = Mg, Mn, Co, Ni, and Zn, H2(dhbq)=2,5-Dihydroxy-1,4-benzoquinone) Promoted by Connected Hydrogen-Bond Networks with Absorbed Water

One-dimensional (1D) coordination polymers, M(dhbq)center dot nH(2)O (M = Mg, Mn, Co, Ni, and Zn, H-2(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 isostnictural. 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.