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首页> 外文期刊>Crystal growth & design >Crystal engineered acid-base complexes with 2D and 3D hydrogen bonding systems using a bisphosphonic acid as the building block
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Crystal engineered acid-base complexes with 2D and 3D hydrogen bonding systems using a bisphosphonic acid as the building block

机译：使用双膦酸作为结构单元的具有2D和3D氢键系统的晶体工程酸碱配合物

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The phosphonic acid iminobis(methylene phosphonic acid), NDP, [NH2(CH2PO3H)(2)] [H3O], exists as a zwitterion and can act as both a hydrogen bond donor and acceptor. NDP synthon was reacted with three organic bases, 2,2'-bipyridine, 4,4'-trimethylene-dipyridine, and a hexaazamacrocyclic crown ether, to construct highly stable hydrogen bonded structures. The 2,2'-bipyridine complex 2 is layered, the layers being formed through hydrogen bonding of the phosphonic acid groups. The layers are largely formed by strong PO-H center dot center dot center dot(-)O-P type hydrogen bonds (2.49-2.62 angstrom) with the protonated bipyridyls held between the layers by strong NH+center dot center dot O-P hydrogen bonds. In complex 3, each amino-nitrogen atom is protonated leaving each phosphonic acid group negatively charged. The NDP molecules align in hydrogen bonded rows in which the molecules are bonded together by quadruple hydrogen bonds: two P-O(-)center dot center dot center dot HO-P and two NH(2)(+)center dot center dot center dot O-P. The rows are then connected to each other by the NH(2)(+)center dot center dot center dot O-P hydrogen bonds between the pyridyl and the phosphonic acid groups. In compound 4, the azacrown ether ring encloses two NDP molecules with four such entities arranged in the unit cell according to the P2(1) symmetry. There are 14 water molecules per ring filling the voids between the rings creating a three-dimensional hydrogen bonding network.
机译：膦酸亚氨基双（亚甲基膦酸）NDP [NH2（CH2PO3H）（2）] [H3O]以两性离子的形式存在，既可以充当氢键供体，也可以充当受体。 NDP合子与三种有机碱（2,2'-联吡啶，4,4'-三亚甲基-二吡啶和六氮杂大环冠醚）反应，以构建高度稳定的氢键结构。层叠2，2′-联吡啶复合物2，该层通过膦酸基团的氢键形成。该层主要由强PO-H中心点中心点中心点（-）O-P型氢键（2.49-2.62埃）形成，质子化联吡啶通过强NH +中心点中心点O-P氢键保持在层之间。在配合物3中，每个氨基氮原子被质子化，使每个膦酸基带负电。 NDP分子在氢键行中对齐，其中分子通过四个氢键结合在一起：两个PO（-）中心点中心点中心点HO-P和两个NH（2）（+）中心点中心点中心点OP 。然后，通过吡啶基和膦酸基团之间的NH（2）（+）中心点中心点中心点中心点O-P氢键将各行彼此连接。在化合物4中，氮杂皇冠醚环根据P2（1）/ n对称性将两个具有四个这样的实体的NDP分子包围在晶胞中。每个环中有14个水分子填充环之间的空隙，从而形成三维氢键网络。

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