通过氢键构筑的含3-硝基邻苯二甲酸的层状超分子化合物

合成了含大量氢键的层状超分子化合物C₄H₁₂N₂](HL)₂ (I)和YL(HL)(H₂O)₃]₂?2H₂O (II) (H₂L＝O₂NC₆H₃- (CO₂H)₂, 3-硝基邻苯二甲酸), 并通过元素分析、红外分析和单晶X衍射表征了组成与结构. 化合物I为双质子化哌嗪阳离子和3-硝基邻苯二甲酸氢根阴离子组成的加合物, 阴离子之间靠强烈的O—H…O氢键形成无限链状结构, 同时阴离子链通过N—H…O氢键与阳离子扩展成网状结构, 相邻的网状结构再由分子间弱作用力构筑成层状超分子. 化合物II则是在双核稀土配合物结构单元通过O—H…O氢键构成的网状结构基础上再进一步由层间弱作用力构筑成的层状超分子化合物. 化合物II的网格结构中, 菱形单元空隙里填充的两个结晶水通过氢键将结点上的双核单元更牢固地结合在一起. 化合物I为单斜晶系, P2₁/c空间群, a＝1.3176(3) nm, b＝1.1096(2) nm, c＝0.75950(15) nm, b＝97.14(3)°, V＝1.1017(4) nm³, Z＝4, μ＝0.129 mm^－1, D_c＝1.533 Mg/m³. 化合物II为三斜晶系, P-1空间群, a＝0.81262(16) nm, b＝0.86942(18) nm, c＝1.5011(3) nm, α＝99.84(3)°, β＝91.26(3)°, γ＝104.55(3)°, V＝1.0091(4) nm³, Z＝1, μ＝2.983 mm^－1, D_c＝1.910 Mg/m³.

Layered Supramolecular Compounds with 3-Nitrophthalic Acid Assembled via Hydrogen Bonding

Layered supramolecular compounds containing different patterns of hydrogen bonds, C₄H₁₂N₂]- (HL)₂ (I) and YL(HL)(H₂O)₃]?2H₂O (II) (H₂L＝O₂NC₆H₃(CO₂H)₂, 3-nitrophthalic acid) have been synthesized and characterized by elemental analysis, IR spectra and X-ray single crystal diffraction. Compound I consists of one diprotonated piperazine cation and two 2-carboxy-6-nitrobenzoate anions. The anions are linked by the strong O—H…O hydrogen bonds into infinite chains, which further extend to sheets by the N—H…O interactions between the anion chains and cations. The 2D layers are assembled into 3D supramolecular network via the weak forces from the adjacent layers. Complex II also has a layered supramolecular architecture packed by the 2D layers, which are constructed by the dinuclear rare-earth complexes with 3-nitrophthalate via intermolecular hydrogen bonds. There are two crystallization water molecules filling up each of the rhombic pores of the network. Compound I crystallizes in the monoclinic system, space group P2₁/c with parameters a＝1.3176(3) nm, b＝1.1096(2) nm, c＝0.75950(15) nm, b＝97.14(3)°, V＝1.1017(4) nm³, Z＝4, m＝0.129 mm^－1, D_c＝1.533 Mg/m³. Complex II crystallizes in triclinic system, space group P-1 with a＝0.81262(16) nm, b＝0.86942(18) nm, c＝1.5011(3) nm, α＝99.84(3)°, β＝91.26(3)°, γ＝104.55(3)°, V＝1.0091(4) nm³, Z＝1, m＝2.983 mm^－1, D_c＝1.910 Mg/m³.