Assembly of two new heterometallic coordination polymers derived from 3-(1H-benzimidazol-2-yl)propanoic acid

Abstract

Two new heterometallic coordination polymers, namely, [SmNa(μ₂-HBIP)(μ₃-HBIP)₃]_n (1) and {[TbAg₂(μ₃-HBIP)(μ₃-BIP)(μ₄-BIP)(H₂O)]·4H₂O}_n (2), have been successfully synthesized under suitable conditions by selecting a N-heterocyclic carboxylic acid, 3-(1H-benzimidazol-2-yl)propanoic acid (H₂BIP), as the multidentate ligand. Single-crystal X-ray diffraction studies indicate that both two compounds are one-dimensional (1D) heterometallic infinite chains, but showing distinctly different structural features. Compound 1 exhibits an interesting 1D heterometallic coordination chain constructed by the combination of two type of sub-chains [Sm(μ₂-HBIP)] and [Na(μ₃-HBIP)] with the μ₃-HBIP⁻ ligands. While compound 2 shows another 1D heterometallic chain built by the connection of discrete [Ag₂(μ₃-HBIP)(μ₃-BIP)(μ₄-BIP)] dinuclear units with Tb(III) centers. Moreover, various interactions, which are N–H···N hydrogen bonds and π…π stacking interactions, further link the 1D heterometallic chains into different 3D supramolecular frameworks of compounds 1 and 2, respectively. Additionally, the thermogravimetric analyses of both two compounds and the photoluminescent property of 2 have been investigated as well.

Keywords:

• Heterometallic coordination polymer
• benzimidazole-based carboxylate ligand
• crystal structure

Additional information

Funding

This work was supported the National Natural Science Foundation of China (Grant Nos. 21603076, and 21571070), the Natural Science Foundation of Guangdong Province (Grant No. 2016A030310437), and the Undergraduates’ Innovating Experimentation Project of SCNU and Guangdong Province (Grant No. 20181462).