Issue 46, 2021

Synthesis, structure and Hirshfeld surface analysis of a series of novel low melting salts without alkyl groups

Abstract

Eight ion-pair compounds, [1-APy]I3 (1), [o-FBz-1-APy]I3 (2), [o-ClBz-1-APy]I3 (3), [o-BrBz-1-APy]I3 (4), [m-FBz-1-APy]I3 (5), [m-ClBz-1-APy]I3 (6), [m-BrBz-1-APy]I3 (7) and [m-IBz-1-APy]I3 (8), were synthesized and characterized structurally. The melting point of 1, 2 and 5–8 is below 90 °C and hence these compounds can be used as ionic liquids. A common characteristic of the crystal structures of 1–8 is that the inorganic components form a linear I3 anion and the non-planar Schiff base cations surround the anion to form molecular stacks. There exist H⋯I hydrogen bond contacts between the cations and I3 anion in the eight compounds, and H⋯H interactions are the main force between the cations. The melting point of crystal 1 is the lowest with 64 °C among the eight compounds. 3 and 4 show higher Tm, ΔHfus and ΔSfus values. The substituent group of the Schiff base cation in the meta-position can also decrease the melting point of the compounds. In addition, Hirshfeld surface analysis was used to understand the intricacies of interactions occurring in the eight compounds, and the relationship between the melting point and the weak interaction was discussed.

Graphical abstract: Synthesis, structure and Hirshfeld surface analysis of a series of novel low melting salts without alkyl groups

Supplementary files

Article information

Article type
Paper
Submitted
16 Maw 2021
Accepted
13 Ndz 2021
First published
23 Nhl 2021

CrystEngComm, 2021,23, 8150-8158

Synthesis, structure and Hirshfeld surface analysis of a series of novel low melting salts without alkyl groups

S. Yu, H. Zhao, J. Shi, H. Zhang and H. Duan, CrystEngComm, 2021, 23, 8150 DOI: 10.1039/D1CE00933H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements