Abstract
Ionic molecular glasses can be conveniently prepared by reacting 1,5-dimexylbiguanide with a wide variety of carboxylic and sulfonic acids. A library of 51 salts has been prepared and studied by differential scanning calorimetry, 25 of which readily form glassy phases and do not recrystallize upon heating or standing. The crystal structures of 1,5-dimexylbiguanide and six of its salts have been solved and studied, and show extended hydrogen-bonded networks. Curiously, 1,5-dimexylbiguanide, which is extremely stable toward crystallization, crystallized in a close-packed, regular structure, unlike most related glass-forming compounds. This apparent paradox was probed with density functional theory calculations which revealed the presence of two conformers of similar energy, thus contributing to frustrate crystallization.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.