Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 5, Issue 7, Pages 6322-6328Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b01495
Keywords
Sulfur dioxide activation; Sulfuric acid; Benzimidazole; Bisulfate; Metastable dianions; Smog formation
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Funding
- Ministry of Earth Sciences (MoES, India)
- Indian Institute of Technology Kanpur [IITK/CHM/20120078]
- University Grants Commission (UGC, India)
- Council of Scientific & Industrial Research (CSIR, India)
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By employing a simple strategy of reacting SO2 gas with easily attainable hydride donors such as 2-substituted-1,3-dimethy1-2,3-dihydro-1H-benzo[d]imidazole, benzimidazoline and SO2 were converted into benzimidazolium bisulfate at room temperature and atmospheric pressure. Bisulfate originated from SO2 and hydride from benzimidazoline and aerial oxygen. Metastable dimers of bisulfate anions were observed in the solid state and in solution where the anions are not stabilized by encapsulation in cages but through hydrogen bonding from benzimidazolium cations. All three benzimidazolines and resulted benzimidazolium bisulfates have been characterized using H-1 and C-13 NMR spectroscopy, high resolution electrospray ionization mass spectrometry, and single crystal X-ray diffraction techniques.
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