New porous coordination polymers based on expanded pyridyl-dicarboxylate ligands and a paddle-wheel cluster
作者:Yong-Sheng Wei、Rui-Biao Lin、Peng Wang、Pei-Qin Liao、Chun-Ting He、Wei Xue、Lei Hou、Wei-Xiong Zhang、Jie-Peng Zhang、Xiao-Ming Chen
DOI:10.1039/c3ce42219d
日期:——
Solvothermal reactions of Cu(NO3)2 and 4,4′-([3,4′-bipyridine]-2′,6′-diyl)dibenzoic acid (H2L1), 3,3′-([4,4′-bipyridine]-2,6-diyl)dibenzoic acid (H2L2), or 4,4′-([4,4′-bipyridine]-2,6-diyl)dibenzoic acid (H2L3) yielded three new metal-carboxylate frameworks (MCF-28, MCF-29 and MCF-30) with a common formula [Cu2(L)2] (H2L = pyridyldicarboxylic acid). X-ray crystallography showed that MCF-28, MCF-29, and MCF-30 are three-dimensional (3,6)-connected rtl, eea and pyr networks, respectively, based on 3-connected tripodal ligands and 6-connected Cu2(RCOO)4(py)2 units (RCOO and py denote carboxylate and pyridyl groups, respectively). Thermogravimetry, powder X-ray diffraction, and gas adsorption measurements indicated that the three compounds became shrunk and amorphous structures after guest removal. Interestingly, single-crystal X-ray diffraction showed that MCF-28 exhibited drastic temperature-induced framework breathing.
Cu(NO3)2 和 4,4'-([3,4'-联吡啶]-2',6'-二基)二苯甲酸 (H2L1), 3,3'-([4,4'-联吡啶]-2,6-二基)二苯甲酸(H2L2),或4,4'-([4,4'-联吡啶]-2,6-二基)二苯甲酸(H2L3)产生了三种具有共同化学式的新金属羧酸盐骨架(MCF-28、MCF-29和MCF-30) [Cu2(L)2](H2L = 吡啶二甲酸)。 X射线晶体学表明MCF-28、MCF-29和MCF-30分别是基于3连接三足配体和6连接Cu2的三维(3,6)连接rtl、eea和pyr网络(RCOO)4(py)2 单元(RCOO 和 py 分别表示羧酸根和吡啶基)。热重分析、粉末X射线衍射和气体吸附测量表明,客体去除后,这三种化合物变得收缩和无定形结构。有趣的是,单晶 X 射线衍射表明 MCF-28 表现出剧烈的温度诱导的骨架呼吸。