Deuterium compounds are chemical substances that contain deuterium, a stable isotope of hydrogen with one proton and one neutron. This gives deuterium a greater mass than regular hydrogen, which has only one proton. Deuterium can replace hydrogen in various compounds, leading to unique properties and applications in fields like chemistry and nuclear physics. Common examples of deuterium compounds include deuterated water (D₂O) and deuterated hydrocarbons. These compounds are often used in scientific research, particularly in NMR spectroscopy, where they help improve the clarity of results by reducing background noise from hydrogen signals.