Metal–organic frameworks are potential proton-conducting electrolytes for proton-exchange membrane fuel cells. Two such new cobalt complexes, namely [Co₂(dip)₂(obb)₂]·2H₂O (1) and [Co₂(dip)₂(btec)(H₂O)]·3H₂O (2), incorporating an N-donor ligand (dip) and polycarboxylate-based ligands (obb and btec) were prepared from hydrothermal syntheses. As elucidated by X-ray crystallography, their 3D frameworks contain extensive H-bonding networks. Compound 1 possesses a 3-fold interpenetrated cag framework, whereas compound 2 consists of [Co₂(O)(COO)₂]_n cluster chains, which are connected by 2-connected btec and dip ligands. The proton conduction for both compounds has been appraised by AC impedance with relative humidity (33–98%) and temperature variation (25–80 °C). The proton conductivity values of 1 span between 7.01 × 10^–7 and 4.28 × 10^–9 S cm^–1 with 98% RH (relative humidity) at 25–85 °C. In contrast, compound 2 displays a significant proton conductivity of 9.56 × 10^–5 S cm^–1 at 65 °C under 98% RH.

中文翻译：

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包含双（咪唑）和聚羧酸盐键的质子传导钴（II）3D MOF：框架拓扑和互穿

金属有机骨架是用于质子交换膜燃料电池的潜在质子传导电解质。两种新的钴配合物，即[Co ₂ (dip) ₂ (obb) ₂ ]·2H ₂ O ( 1 ) 和[Co ₂ (dip) ₂ (btec)(H ₂ O)]·3H ₂ O ( 2 ) ，结合 N 供体配体 (dip) 和基于聚羧酸盐的配体 (obb 和 btec) 从水热合成中制备。正如 X 射线晶体学所阐明的那样，他们的 3D 框架包含广泛的 H 键网络。化合物1具有 3 倍互穿的 cag 骨架，而化合物2由 [Co ₂ (O)(COO) ₂ ] _n簇链组成，由 2 个连接的 btec 和 dip 配体连接。两种化合物的质子传导均通过交流阻抗与相对湿度 (33–98%) 和温度变化 (25–80 °C) 进行评估。的质子传导性值1个跨度7.01之间×10 ^-7和4.28×10 ^-9小号厘米^-1与98％RH（相对湿度），在25-85℃。相比之下，化合物2在 65 °C 和 98% RH 下显示出显着的质子电导率 9.56 × 10 ^–5 S cm ^–1。