Zaharani, Lia and Rafie, Mohd Johan and Khaligh, Nader Ghaffari (2024) Bis1,3-di(4-piperidinium)propane] di-hydrogensulfate mono-sulfate trihydrate: An organic molten salt containing simultaneous acceptor-donor hydrogen bonding and Bro<spacing diaeresis>nsted acid for homogeneous catalysis. Journal of Molecular Structure, 1304. p. 137621. ISSN 0022-2860, DOI https://doi.org/10.1016/j.molstruc.2024.137621.
Full text not available from this repository.Abstract
The simultaneous presence of sulfate and hydrogen sulfate in the crystal structure of an organic molten salt was demonstrated by single-crystal X-ray diffraction. The plenty of intra-hydrogen bonding between the dication of the protonated 1,3-di(4-piperidinyl)propane (TMDP), anions of sulfate and hydrogen sulfate, and crystalline water, as well as the existence of Bro center dot nsted acid of HSO4]- gives a strong ionic network. Spectroscopic and single-crystal studies reveal that the origin of superior binding for organic molten salt is correlated with the formation of strong hydrogen bonds between organic dications, sulfate and hydrogen sulfate anions, and crystalline waters. Though FTIR spectroscopy is a useful tool to prove the presence of sulfate or hydrogen sulfate, the existence of simultaneous HSO4]- and SO4]2- cannot be differentiated from the presence of HSO4]- by the FTIR spectrum. Two protonated piperidinyl rings were in the chair conformation. The tetrahedral geometry was observed around sulfur atoms in sulfate and hydrogen sulfate ions. This salt is another sample of unique organic molten salts in the sense that both sulfate and hydrogen sulfate anions are simultaneously linked through hydrogen bonds with the protonated piperidinyl rings of TMDP in one unit cell; nevertheless, there is no direct hydrogen bond between hydrogen sulfate and sulfate anions. Its unit cell contains two protonated TMDP, one sulfate, two hydrogen sulfate, and three crystalline waters. The crystal structure is stabilized by classical N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds, generating a strong three-dimensional network. In addition, the catalytic activity of the organic salt was demonstrated by preparing various 3,4,5-trisubstituted furan-2-one using a catalytic amount of the organic salt under mild and greener conditions owing to the existence of donor-acceptor hydrogen bonding sites and the presence of Bro center dot nsted acid anion.
| Item Type: | Article |
|---|---|
| Funders: | Nippon Sheet Glass Foundation for Materials Science and Engineering, Japan (IF008-2023), UM International Collaboration Grant, Universiti Malaya, Malaysia (ST018-2022) |
| Uncontrolled Keywords: | Crystal growth; Homogeneous catalysis; Multicomponent reaction; Green chemistry |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 07 Nov 2024 04:10 |
| Last Modified: | 07 Nov 2024 04:10 |
| URI: | http://eprints.um.edu.my/id/eprint/45658 |
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