Observation of a Persistent Supramolecular Synthon Involving Carboxyl Groups and H2O That Guides the Formation of Polycatenated Co-crystals of a Tritopic Carboxylic Acid and Bis(pyridyls)
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- 作者：Lian-Cheng Wang ; Junliang Sun ; Zhi-Tang Huang ; Qi-Yu Zheng
- 刊名：Crystal Growth & Design
- 出版年：2013
- 出版时间：January 2, 2013
- 年：2013
- 卷：13
- 期：1
- 页码：1-5
- 全文大小：359K
- 年卷期：v.13,no.1(January 2, 2013)
- ISSN：1528-7505
文摘
In a nonprotic solvent, a (H2O)2(COOH)3(L) supramolecular synthon was found to guide the formation of five new crystal structures together with HPB-3a (1,3,5-tris(4-carboxyphenyl)-2,4,6-tris(4-tert-butylphenyl)benzene). This synthon acted as a 3-connected trigonal planar node (L = acetone) in 1 [(HPB-3a)(H2O)2(acetone)3] or a 4-connected trigonal pyramidal node (L = pyridyl) in 2 [(HPB-3a)(bipy)0.5(H2O)2], 3 [(HPB-3a)(azopy)0.5(H2O)2], 4 [(HPB-3a)(bipy-ete)0.5(H2O)2], and 5 [(HPB-3a)(bipy-eta)0.5(H2O)2] (bipy = 4,4鈥?bipyridine, azopy = azopyridine, bipy-ete = trans-1,2-bis(4-pyridyl)ethene, bipy-eta = 1,2-bis(4-pyridyl)ethane). The formation of this synthon could be attributed to the C3-symmetry of planar HPB-3a molecules and the hydrophobic interactions between tert-butyl groups. 1 represents a continuously interdigitated 63-hcb layer structure. 2鈥?b>5 are with the same topology and display amazing 2D homochiral bilayers, which were penetrated in parallel by two others (鈥渁bove鈥?and 鈥渂elow鈥? with the opposite chirality to form overall 3D racemic networks. However, the synthon was not as robust in the presence of protic solvents. In 6 [(HPB-3a)(MeOH)3], carboxyl groups interact directly with hydroxyl groups of methanol to form 1D hydrogen bonding chains. The structure is a 3-fold interpenetrated 49路66-acs network.