Javed Ali, Steinke Felix, Wöhlbrandt Stephan, Bunzen Hana, Stock Norbert, Tiemann Michael
Department of Chemistry, Paderborn University, 33098 Paderborn, Germany.
Institute of Inorganic Chemistry, Christian-Albrecht University, Kiel, Germany.
Beilstein J Nanotechnol. 2022 May 4;13:437-443. doi: 10.3762/bjnano.13.36. eCollection 2022.
The proton conductivity of two coordination networks, [Mg(HO)(HL)]·HO and [Pb(HL)]·HO (HL = (HOPCH)-NCH-CH-SOH), is investigated by AC impedance spectroscopy. Both materials contain the same phosphonato-sulfonate linker molecule, but have clearly different crystal structures, which has a strong effect on proton conductivity. In the Mg-based coordination network, dangling sulfonate groups are part of an extended hydrogen bonding network, facilitating a "proton hopping" with low activation energy; the material shows a moderate proton conductivity. In the Pb-based metal-organic framework, in contrast, no extended hydrogen bonding occurs, as the sulfonate groups coordinate to Pb, without forming hydrogen bonds; the proton conductivity is much lower in this material.
通过交流阻抗谱研究了两种配位网络[Mg(HO)(HL)]·HO和[Pb(HL)]·HO（HL = (HOPCH)-NCH-CH-SOH）的质子传导率。两种材料都含有相同的膦酸酯-磺酸酯连接分子，但具有明显不同的晶体结构，这对质子传导率有很大影响。在基于镁的配位网络中，悬挂的磺酸酯基团是扩展氢键网络的一部分，有助于以低活化能进行“质子跳跃”；该材料显示出适度的质子传导率。相比之下，在基于铅的金属有机框架中，由于磺酸酯基团与铅配位而不形成氢键，因此不会发生扩展氢键；该材料中的质子传导率要低得多。
