Delicate substituent effect of benzene-1,2,3-tricarboxyl tectons on structural assembly of unusual self-penetrating coordination frameworks
Crystal Growth and Design, ISSN: 1528-7483, Vol: 10, Issue: 7, Page: 3036-3043
2010
- 120Citations
- 21Captures
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Article Description
Eight Zn and Cd coordination complexes, {[Zn (nbta)(bpy)(HO) ](HO)} (1), [Zn (nbta)(bpe)(OH)] (2), {[Cd(nbta)(bpy)(HO) ](HO)} (3), {[Cd (nbta)(bpe)(HO) ](HO)} (4), [Zn2(Hbta)2(bpy) 2(H2O)2](H2O) (5), [Zn(bta)(Hbpe)]n (6), [Cd(bta) (Hbta)(bpy)(HO)]n (7), and {[Cd(bta)(bpe)(HO) (OH)](HO)}n (8), were prepared via hydrothermal reactions based on Hnbta or Hbta (Hnbta=5-nitro-1,2,3-benzenetricarboxylic acid and H bta=1,2,3- benzenetricarboxylic acid) and the dipyridyl-type coligand 4,4′-bipyridyl (bpy) or 1,2-di(4-pyridyl)ethene (bpe). All complexes were characterized by elemental analysis, IR spectra, and X-ray powder diffraction techniques. Complexes 1-4 all display unusual three-dimensional (3-D) self-penetrating coordination networks. From the topology point of view, complexes 1 and 2 display the 4-connected frameworks with the Schläfli symbols of (4.10.12)(4.6.8) (4.6) and (4.6.7 .8)(4.6.7.8), respectively. Complex 3 features an unprecedented 3-nodal network with (3,5,6)-connectivity and the Schläfli symbol of (5.6.7 .8.10)(5.6.7.8) (5.6), also exhibiting an intriguing polyrotaxane entangled motif. Complex 4 shows a new 4-connected (4 .6.8)(6.8.10) topology. Different from 1-4, complexes 5-8 based on H3bta all present the non-selfpenetrating structural type. Complex 5 possesses binuclear units which are further extended to a two-dimensional (2-D) supramolecular network via extensive H-bonding interactions, showing alternate left- and right-handed helical chains. Complex 6 has a 2-D layered motif generated via H-bonding interactions between the one-dimensional (1-D) coordination chains. Complex 7 shows a 3-D coordination framework, which is constructed from the 2-D metal-carboxylate layers pillared by the rod-like bipy spacers. Complex 8 presents a 2-D net with the [Cd(μ-OH) ] clusters as the linking nodes. These results reveal that the existence of the electron-withdrawing -NO group in such a tricarboxyl building block plays a critical role in structural direction of the self-penetrating coordination frameworks. © 2010 American Chemical Society.
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