Metal oxide-organic frameworks (MOOFs), a new series of coordination hybrids constructed from molybdenum(vi) oxide and bitopic 1,2,4-triazole linkers
作者:Andrey B. Lysenko、Ganna A. Senchyk、Jörg Lincke、Daniel Lässig、Andrey A. Fokin、Ekaterina D. Butova、Peter R. Schreiner、Harald Krautscheid、Konstantin V. Domasevitch
DOI:10.1039/b922732f
日期:——
A series of molybdenum(VI) oxide–organic solids were prepared by hydrothermal reactions employing N-donor tectons, which combine two 1,2,4-triazol-4-yl sites separated by representative aliphatic spacers (ethylene, tr2eth; 1,3-propylene, tr2pr; trans-1,4-cyclohexanediyl, tr2cy; diamondoid 1,3-adamantanediyl, tr2ad; 1,6- and 4,9-diamantanediyls, 1,6-tr2dia and 4,9-tr2dia) and heterofunctional 5-[4-(1,2,4-triazol-4-yl)phenyl]tetrazole (trtz). In all the compounds the 1,2,4-triazol-4-yl group acts as a short-distance N1,N2-bridge between two Mo ions (Mo–N 2.36–2.50 Å). The 3D framework structure is based upon pseudo-41 helices ([Mo4O12(tr2eth)2] 1, [Mo2O6(tr2cy)] 3) or sinusoidal chains ([Mo2O6(tr2pr)] 2, [Mo2O6(tr2ad)]·6H2O 4, [Mo2O6(4,9-tr2dia)]·0.5H2O 5) of vertex-sharing MoO4N2 octahedra, while the bitopic organic ligands manifest a dual role as connectors for two adjacent octahedra and as links between separate 1D inorganic subtopologies. For linear, lengthy tectons tr2cy and 4,9-tr2dia two identical frameworks interpenetrate. In [MoO3(trtz)] 7, the 41 helices aggregate into 3D tetragonal framework (five-fold interpenetrated) by hydrogen bonding between the tetrazole groups. The 2D structure of [Mo4O12(1,6-tr2dia)]·2H2O 6 is influenced by the very bulky aliphatic portion of the ligands, which connect chains of edge-shared octahedra MoO5N (Mo–N 2.346(2), 2.456(2) Å).
1,3-丙烯,tr2pr;反式-1,4-环己二基,tr2cy;菱形-1,3-金刚烷二基,tr2ad;1,6-和 4,9-二金刚烷二基,1,6-tr2dia 和 4,9-tr2dia)以及杂官能团 5-[4-(1,2,4-三唑-4-基)苯基]四氮唑(trtz)。在所有化合物中,1,2,4-三唑-4-基团在两个钼离子(Mo-N 2.36-2.50 Å)之间起着短距离 N1、N2 桥的作用。三维框架结构基于伪 41 螺旋([Mo4O12(tr2eth)2] 1、[Mo2O6(tr2cy)] 3)或正弦链([Mo2O6(tr2pr)] 2、[Mo2O6(tr2ad)]-6H2O 4、[Mo2O6(4,9-tr2dia)]-0.5H2O 5)的顶点共享 MoO4N2 八面体,而二位有机配体则表现出双重作用,既是两个相邻八面体的连接体,又是独立的一维无机子拓扑之间的纽带。对于线性长构造体 tr2cy 和 4,9-tr2dia 而言,两个相同的框架相互渗透。在[MoO3(trtz)] 7 中,41 个螺旋通过四氮唑基团之间的氢键聚合成三维四方框架(五倍互穿)。Mo4O12(1,6-tr2dia)]-2H2O 6 的二维结构受到配体中非常笨重的脂肪族部分的影响,这些配体连接了边缘共享八面体 MoO5N 链(Mo-N 2.346(2)、2.456(2) Å)。