These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
Phase change materials (PCMs) which melt in the
temperature range of 100-230 °C, are a promising alternative for the storage of
thermal energy. In this range, large amounts of energy available from
solar-thermal, or other forms of renewable heat, can be stored and applied to domestic
or industrial processes, or to an Organic Rankine Cycle (ORC) engine to
generate electricity. The amount of energy absorbed is related to the latent heat
of fusion (ΔHf) and is often connected to the extent of hydrogen
bonding in the PCM. Herein, we report fundamental studies, including crystal
structure and Hirshfeld surface analysis, of a family of guanidinium organic
salts that exhibit high values of ΔHf, demonstrating that the
presence and strength of H-bonds between ions plays a key role in this property.