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Updated: May 27, 2026

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

2-Ethyl-imidazolium terephthalate.

Run-Qiang Zhu¹, Chun-Hua Yu

¹Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|November 8, 2011

Summary

This study details the crystal structure of a compound containing a protonated 2-ethyl-imidazolium cation and terephthalate anions. Hydrogen bonding interactions lead to a layered structure with disordered ethyl groups and hydroxyl groups.

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Area of Science:

Crystallography
Materials Science
Supramolecular Chemistry

Background:

Imidazolium salts are versatile building blocks in crystal engineering.
Terephthalate anions are commonly used in the formation of coordination polymers and metal-organic frameworks.
Understanding hydrogen bonding is crucial for designing functional materials.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(5)H(9)N(2)(+)·C(8)H(5)O(4)(-).
To investigate the intermolecular interactions, specifically hydrogen bonding, within the crystal lattice.
To characterize the structural features, including disorder, of the cation and anion.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
Analysis of bond lengths, bond angles, and hydrogen bonding networks was performed.
Disorder in the ethyl and hydroxyl groups was modeled and refined.

Main Results:

The asymmetric unit contains one protonated 2-ethyl-imidazolium cation and two half terephthalate anions.
N-H⋯O hydrogen bonds link cations and anions, forming a layered structure.
O-H⋯O interactions further stabilize the anionic layers.
Disorder was observed in the ethyl group of the cation and the hydroxyl groups of the anions.

Conclusions:

The compound forms a layered supramolecular structure driven by hydrogen bonding.
The observed disorder provides insights into the dynamic behavior of the constituent ions.
This structural characterization contributes to the understanding of imidazolium-based salt crystal engineering.