Effect of anions on cadmium(II) complexes with ligand 2-(pyrazin-2-yl)-1H-benzimidazole |
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Authors: | Yong-Tao Wang Shi-Chen Yan Gui-Mei Tang Chao Zhao Tian-Duo Li Yue-Zhi Cui |
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Affiliation: | Department of Chemical Engineering, Shandong Provincial Key Laboratory of Fine Chemicals, Shandong Polytechnic University, Jinan 250353, China |
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Abstract: | Three new supramolecular complexes based on a 2-(pyrazin-2-yl)-1H-benzimidazole (Hpbi) and a series of Cd(II) salts have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction analysis. Reaction of CdCl2·2.5H2O with Hpbi afforded a one-dimensional chain [Cd(Hpbi)Cl2] (1), which exhibits a three-dimensional (3-D) supramolecular architecture through intermolecular X-H···Cl (X = N and C) hydrogen bonds and π-π stacking interactions. When using CdBr2·4H2O instead of CdCl2·2.5H2O under similar reaction conditions, a bisnuclear complex [Cd(Hpbi)2Br2] (2) is obtained, which obviously exhibits intermolecular X-H···Br (X = N and C) hydrogen bonds and π-π stacking interactions. When CdI2 take place of CdCl2·2.5H2O, a mononuclear complex, [Cd(Hpbi)2I2] (3), is isolated, which shows a 3D supramolecule framework formed by intermolecule hydrogen bonds and π-π packing interactions. Interestingly, the Hpbi ligand exhibits the same coordination modes in complexes 1-3. It is noteworthy that the radius of anions plays an important role in affecting the structures and luminescent intensity of the final products. The TGA for 1-3 have been investigated and discussed in detail. |
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Keywords: | Anion-dependent 2-(Pyrazin-2-yl)-1H-benzimidazole Cadmium complexes Fluorescence Luminescent intensity |
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