1. The length of ankyl chain tuning the structure and properties of organic assemblies composed of triazole and organic acids.
- Author
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Li, Yao-Jia, Luo, Yang-Hui, Wang, Jing-Wen, Chen, Chen, and Sun, Bai-Wang
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TRIAZOLE derivatives , *ORGANIC acids , *OXALATES , *ADIPIC acid , *DIFFERENTIAL scanning calorimetry - Abstract
Three salts: 3-amino-1,2,4-triazolinium (1+) hydrogen oxalate ( 1 ), 3-amino-1,2, 4-triazolinium (1+) hydrogen malonate ( 2 ), 3-amino-1,2,4-triazolinium (1+) hydrogen succinate ( 3 ) and one co-crystal: 3-amino-1,2,4-triazole-adipic acid ( 4 ) have been prepared and characterized by differential scanning calorimetry (DSC), thermogravimetric analyses (TGA), IR, Raman, and single-crystal X-ray diffraction. Wherein, supramolecular motif in salts 1 , 3 and co-crystal 4 were dominant by triazole-acid and amino-acid heterosynthon, while salt 2 dominant by amino-triazole homosynthon in addition to triazole-acid heterosynthon, which attribute to the intermolecular hydrogen interactions within hydrogen malonate anion. These results have a close relationship with the ΔpKa between 3-ATZ and alkyl acids, we found that the ΔpKa is grate than 6.9, the formation of salt will be expected, while the formation of co-crystal usually with the ΔpKa less than 6.75. It is interesting that salts 2 and 3 show the phenomenon of proton transfer after melt, which lead to the stepwise sublimation of the two components. The differences between salts and co-crystal were also revealed by the solid-state vibrational spectroscopy (IR and Raman), Hirshfeld surface analysis and UV spectra. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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