Proton-conductive metal-organic frameworks (MOFs) have attracted great attention for their promising application in membrane fuel cells. To explore proton-conductive MOFs with high performance, here we present four lanthanide-hypophosphite frameworks with distinct amine guests. These complexes possess a general formula [AH][Gd₂(H₂PO₂)₇] (AH = protonated amines). Due to the rich hydrogen bond networks, complex 1 with guanidinium as guest shows high proton conductivity of 1.75 × 10^–2 S·cm^–1 at a relative humidity of 97% (368 K). We also studied the magnetic properties of complex 1 and reveal that the hypophosphite ligand transfers weak antiferromagnetic interactions between Gd³⁺ ions.

中文翻译：

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具有高质子电导率的胍客体镧系-次磷酸盐骨架

质子导电金属有机框架（MOF）因其在膜燃料电池中的应用前景而备受关注。为了探索具有高性能的质子传导 MOF，我们在这里展示了四种具有不同胺客体的镧系元素-次磷酸盐骨架。这些配合物具有通式[AH][Gd ₂ (H ₂ PO ₂ ) ₇ ]（AH = 质子化胺）。由于丰富的氢键网络，以胍为客体的配合物 1在 97% (368 K) 的相对湿度下显示出 1.75 × 10 ^–2 S·cm ^{–1 的}高质子传导率。我们还研究了配合物 1 的磁性，并揭示了次磷酸盐配体在 Gd 之间传递弱反铁磁相互作用³⁺离子。