Two Unexpected Temperature-Induced Supermolecular Isomers from Multi-Topic Carboxylic Acid: Hydrogen Bonding Layer or Helix Tube

Chunyang Li; Chunhong Tan; Juan Zhou; Yan-Yong Lin; Xiao-Feng Wang

doi:10.3390/molecules26226938

Two Unexpected Temperature-Induced Supermolecular Isomers from Multi-Topic Carboxylic Acid: Hydrogen Bonding Layer or Helix Tube

Molecules. 2021 Nov 17;26(22):6938. doi: 10.3390/molecules26226938.

Authors

Chunyang Li¹, Chunhong Tan¹, Juan Zhou^{1

2}, Yan-Yong Lin³, Xiao-Feng Wang¹

Affiliations

¹ School of Chemistry and Chemical Engineering and Hunan Key Laboratory for the Design and Application of Actinide Complexes, University of South China, Hengyang 421001, China.
² School of Mechanical Engineering, University of South China, Hengyang 421001, China.
³ School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China.

Abstract

Under ambient conditions or 160 °C, two supramolecular isomers, namely [(H₄PTTA)(H₂O)₂(DMF)] and [(H₄PTTA)(H₂O)₃]··Guest (1-L and 1-H, H₄PTTA = N-phenyl-N'-phenyl bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxdiimide tetra-carboxylic acid, Guest = DMF and H₂O), were obtained through the reaction of H₄PTTA in a mixture of H₂O and dimethylformamide. The single crystal structures reveal the temperature-dependent supramolecular isomerism derived from the torsion of semi-rigid of H₄PTTA. The 1-L prepared at room temperature is a hydrogen bond based achiral layer, while the hydrothermal synthesized 1-H is isomer resulted in an H-bond-based chiral tubes-packed supramolecular framework.

Keywords: crystal structure; hydrogen bonding; supramolecular isomeric; temperature-induced; tetra-carboxylic acid.

Abstract

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