Fabrication of new structures from a 3D cobalt phosphonate network: structural transformation and proton conductivity investigation

Abstract

Three new compounds with novel structures were prepared from cobalt 318, among which, 0-dimensional structural compound 1 shows a higher proton conductivity.

Water-Mediated Proton Conduction in Metal–Organic Frameworks with High Water Stability Constructed by a Terpyridine Tricarboxylate Ligand

“…Further probing into proton-conductive mechanisms was achieved through the fitting of the Arrhenius equation [ T σ = σ 0 exp­(− E a /k T )] to the E a values of H 3 tcpb-H 2 O and 1 – 3 at 68 and 98% RH . As displayed in Figure i–l, the E a values of H 3 tcpb-H 2 O and 1–3 at 68% RH are 0.77, 0.93, 0.71, and 0.55 eV, respectively.…”

“…Further probing into proton-conductive mechanisms was achieved through the fitting of the Arrhenius equation [T σ = σ 0 exp(−E a /kT)] 11 to the E a values of H 3 tcpb-H 2 O and 1−3 at 68 and 98% RH. 61 As displayed in Figure 4i−l, the E a values of H 3 tcpb-H 2 O and 1−3 at 68% RH are 0.77, 0.93, 0.71, and 0.55 eV, respectively. The E a > 0.5 eV of H 3 tcpb-H 2 O and 1− 3 at low humidity indicates that the directional migration of protons mainly relies on various hydrated protons (H 3 O + ) n with the water molecules absorbed through concentration diffusion, in which this mode of proton transfer named Vehicle mechanism (>0.4 eV).…”

Metal phosphonates as heterogeneous catalysts for highly efficient chemical fixation of CO2 under mild conditions

“…The bond lengths of Co–O are in the range of 2.021(4)–2.186(4), which are comparable to those of other cobalt phosphonates. 31 Two phosphonic acid groups in the zoledronic acid are linked to the cobalt atoms through unidentate moieties in μ 3 -η 1 :η 2 and μ 3 -η 1 :η 1 :η 1 binding modes to form a two-dimensional layer. These layers further form a three-dimensional supramolecular structure through hydrogen bonding and Π–Π stacking (Fig.…”