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Supramolecular assemblies involving salt-bridges: DFT and X-ray evidences of bipolarity

Abstract

A series of pyridinium-carboxylate salts (1‒3) were designed, synthesized and structurally characterized to explore the importance of salt-bridge (SB) interactions in building self-assembled structures. We present a comprehensive analysis of the SB interaction in crystal structures of 4,4′-oxybis(benzoic acid) with substituted aminopyridines where the SBs displays extremely well defined geometric preferences. In the solid-state, compound (1) exhibit lone-pair(l.p)···(SB)/(SB)···π+ assemblies while compound (2) shows C‒H···(SB)/(SB)···π network. Interestingly, compound (3) exhibits two distinct networks π+···(SB)/(SB)···(SB)/(SB)···π+ and C‒H···(SB)/(SB)···H‒C. These extended supramolecular networks are studied and described in detail. The duality of the SBs in stabilizing the π-facial interactions with electron rich and/or electron poor moieties are also described. The energetic and geometric features of salt-bridge interaction are studied and its impact on the resultant supramolecular organization are analyzed using theoretical DFT-D3 calculations. The theoretical study combines the energetic features of the noncovalent forces that participate in the extended network and the characterization of the diverse interactions by means of Bader’s theory of ‘atoms in molecules’(AIM).

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Supplementary files

Article information


Submitted
17 Sep 2020
Accepted
15 Oct 2020
First published
15 Oct 2020

CrystEngComm, 2020, Accepted Manuscript
Article type
Paper

Supramolecular assemblies involving salt-bridges: DFT and X-ray evidences of bipolarity

S. Tripathi, S. K. Seth, S. Islam, A. Bauza, A. Frontera and S. Mukhopadhyay, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/D0CE01356K

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