Anionic Host Layers Constructed with Guanidinium鈥揌ydrogen Carbonate Dimer 2:1 Rosette-Ribbons and Bridging Carboxylate Connectors
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- 作者：Jie Han ; Chung-Wah Yau ; Chin Wing Chan ; Thomas C. W. Mak
- 刊名：Crystal Growth & Design
- 出版年：2012
- 出版时间：September 5, 2012
- 年：2012
- 卷：12
- 期：9
- 页码：4457-4465
- 全文大小：755K
- 年卷期：v.12,no.9(September 5, 2012)
- ISSN：1528-7505
文摘
Four new inclusion compounds featuring an anionic layer-type host lattice constructed with guanidinium鈥揵is(hydrogen carbonate) 2:1 rosette-ribbons that accommodate the same tetra-n-butylammonium guest species have been obtained and characterized by single-crystal X-ray analysis. In these crystal structures, an array of rosette-ribbons in parallel or nearly parallel alignment are cross-linked by selected carboxylate molecular connectors with effective bridging distances in the range 10.1鈥?9.8 脜: 4,4鈥?biphenyldicarboxylate, with the longest separation between its colinear hydrogen-bonding acceptor sites in [(n-Bu)4N+]6[C(NH2)3+]6(HCO3鈥?/sup>)6[4,4鈥?C12H8(COO鈥?/sup>)2]3路6H2O (1); cyclohexane-1,4-dicarboxylate, with a nonplanar molecular skeleton in [(n-Bu)4N+]4[C(NH2)3+]8(HCO3鈥?/sup>)6[1,4鈥?C6H10(COO鈥?/sup>)2]3路8H2O (2); 4-cyanobenzoate, with a strong 鈥淵 type鈥?hydrogen-bonding acceptor site at one end and a weak one at the other in [(n-Bu)4N+]2[C(NH2)3+]2(HCO3鈥?/sup>)2[NCC6H4(COO鈥?/sup>)]2路2H2O (3); and 1H-imidazole-4,5-dicarboxylate, functioning as a multiple hydrogen-bond acceptor in [(n-Bu)4N+]3[C(NH2)3+]4(HCO3鈥?/sup>)4[H+{C3N2H鈥?/sup>(COO鈥?/sup>)(COOH)}2] (4). The resulting planar anionic layer in 1 becomes an undulatory one in 3 and 4. In 2, adjacent wavy layers are supported by centrosymmetric cyclic (GM+)2(H2O)4 鈥渄ouble molecular pillars鈥?to yield a three-dimensional anionic host network.