Anana Hayet, Trifa Chahrazed, Bouacida Sofiane, Boudaren Chaouki, Merazig Hocine
Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Constantine 1, 25000 , Algeria.
Département Sciences de la Matière, Faculté des Sciences Exactes et Sciences de la Nature et de la Vie, Université Larbi Ben M'hidi, Oum El Bouaghi, Algeria ; Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale, CHEMS, Université Constantine 1, 25000 , Algeria.
Acta Crystallogr E Crystallogr Commun. 2015 Apr 22;71(Pt 5):m114-5. doi: 10.1107/S2056989015007008. eCollection 2015 May 1.
The title compound, poly[di-aqua-tris-(μ4-but-2-enedioato)(μ2-but-2-enedioic acid)dilanthanum(III)], [La2(C4H2O4)3(C4H4O4)(H2O)2] n , was synthesized by the reaction of lanthanum chloride penta-hydrate with fumaric acid under hydro-thermal conditions. The asymmetric unit comprises an La(III) cation, one and a half fumarate dianions (L (2-)), one a half-mol-ecule of fumaric acid (H2 L) and one coordinated water mol-ecule. Each La(III) cation has the same nine-coordinate environment and is surrounded by eight O atoms from seven distinct fumarate moieties, including one proton-ated fumarate unit and one water mol-ecule in a distorted tricapped trigonal-prismatic environment. The LaO8(H2O) polyhedra centres are edge-shared through three carboxyl-ate bridges of the fumarate ligand, forming chains in three dimensions to construct the MOF. The crystal structure is stabilized by O-H⋯O hydrogen-bond inter-actions between the coordin-ated water mol-ecule and the carboxyl-ate O atoms, and also between oxygen atoms of fumaric acid.
标题化合物聚[二水合-三-(μ4-丁-2-烯二酸根)(μ2-丁-2-烯二酸)二镧(III)]，[La₂(C₄H₂O₄)₃(C₄H₄O₄)(H₂O)₂]ₙ，是通过水合氯化镧与富马酸在水热条件下反应合成的。不对称单元包括一个La(III)阳离子、一个半富马酸二价阴离子（L²⁻）、一个半富马酸分子（H₂L）和一个配位水分子。每个La(III)阳离子具有相同的九配位环境，被来自七个不同富马酸部分的八个O原子包围，包括一个质子化的富马酸单元和一个水分子，处于扭曲的三帽三棱柱环境中。LaO₈(H₂O)多面体中心通过富马酸配体的三个羧酸根桥边共享，在三维空间中形成链以构建金属有机框架。晶体结构通过配位水分子与羧酸根O原子之间以及富马酸的氧原子之间的O—H⋯O氢键相互作用得以稳定。
