  We present an X-ray Compton scattering study on aqueous Trimethylamine
N-oxide (TMAO) and guanidine hydrochloride solutions (GdnHCl) as a function of
temperature. Independent from the concentration of the solvent, Compton
profiles almost resemble results for liquid water as a function of temperature.
However, The number of hydrogen bonds per water molecule extracted from the
Compton profiles suggests a decrease of hydrogen bonds with rising temperatures
for all studied samples, the differences between water and the solutions are
weak. Nevertheless, the data indicate a reduced bond weakening with rising TMAO
concentration up to 5M of 7.2% compared to 8 % for pure water. In contrast, the
addition of GdnHCl appears to behave differently for concentrations up to 3.1 M
with a weaker impact on the temperature response of the hydrogen bond
structure.
