A series of Cd(II) supramolecular architectures based on polycarboxylate and 2-amino-benzimidazole mixed-ligands

作者：Wang Xiu Guang; Li Jian; Ding Bin; Yang En Cui; Zhao Xiao Jun^*

来源：Journal of Molecular Structure, 2008, 876(1-3): 268-277.

DOI：10.1016/j.molstruc.2007.06.030

• supramolecular
• 2-amino-benzimidazole
• C-H center dot center dot center dot pi
• reversible transformation

By reaction of Cd(II) salts, different aromatic/aliphatic carboxylic acid and 2-amino-benzimidazole (Abm), four crystalline supramolecular coordination polymers, {[Cd-2(tma)(2)(Abm)(4)]center dot(2)(HAbm)center dot 5.5(H2O)}(n) (1), {[Cd(tp)(Abm)(2)]center dot(DMF)}(n) (2), {[Cd(iP)(2)]center dot 2(HAbm)}(n) (3), and {[Cd(ga)(2)]center dot 2(HAbm)}(n) (4) (H(3)tma = trimesic acid; H(2)tP = terephalatic acid; H(2)iP = isophthalic acid; H(2)ga = glutaric acid), have been successfully synthesized. In I pairs of ID right- and left-hand helical structure and in 2 ID zigzag chains can be found, which are further extended into 3D hydrogen bonded frameworks via strong intra- and inter-chain N-H center dot center dot center dot O interactions. In contrast, 3 and 4 with 2D layer structure are stacked together in the ABAB way, where protonated HAbm cations are located between 2D layers and further stabilized by cooperative N-H center dot center dot center dot O, pi center dot center dot center dot pi and C-H center dot center dot center dot pi interactions. Interestingly, single crystal 3 can reversibly transform into single crystal of its hydrated compound 3a, indicating small guest water molecules can be effectively absorbed in the host framework of 3. The FT-IR spectra of 1-4 have also been discussed briefly.

• 出版日期2008-3-30
• 单位天津师范大学