Iguchi Masayuki, Zhong Heng, Himeda Yuichiro, Kawanami Hajime
Research Institute for Chemical Process Technology, Department of Material and Chemistry, National Institute of Advanced Industrial Science and Technology, Sendai, Miyagi, 983-8551, Japan.
Research Institute of Energy Frontier, Department of Energy and Environment, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, 305-8565, Japan.
Chemistry. 2017 Dec 14;23(70):17788-17793. doi: 10.1002/chem.201703766. Epub 2017 Nov 22.
The hydroxyl groups of a 2,2'-bipyridine (bpy) ligand near the metal center activated the catalytic performance of the Ir complex for the dehydrogenation of formic acid at high pressure. The position of the hydroxyl groups on the ligand affected the catalytic durability for the high-pressure H generation through the decomposition of formic acid. The Ir complex with a bipyridine ligand functionalized with para-hydroxyl groups shows a good durability with a constant catalytic activity during the reaction even under high-pressure conditions, whereas deactivation was observed for an Ir complex with a bipyridine ligand with ortho-hydroxyl groups (2). In the presence of high-pressure H , complex 2 decomposed into the ligand and an Ir trihydride complex through the isomerization of the bpy ligand. This work provides the development of a durable catalyst for the high-pressure H production from formic acid.
金属中心附近的2,2'-联吡啶（bpy）配体的羟基激活了Ir配合物在高压下催化甲酸脱氢的性能。配体上羟基的位置影响了通过甲酸分解产生高压氢气的催化耐久性。具有对羟基官能化的联吡啶配体的Ir配合物即使在高压条件下反应期间也表现出良好的耐久性和恒定的催化活性，而具有邻羟基联吡啶配体的Ir配合物（2）则观察到失活。在高压氢气存在下，配合物2通过bpy配体的异构化分解为配体和Ir三氢化物配合物。这项工作为从甲酸生产高压氢气开发了一种耐用催化剂。
