Used as a deuterated solvent in nuclear magnetic resonance (NMR) spectroscopy to study molecular structure and dynamics. Its deuterium atoms do not interfere with proton signals, enabling clearer analysis of compound behavior. Also employed in kinetic isotope effect studies to investigate reaction mechanisms. Commonly used in analytical chemistry for calibration and as a tracer in metabolic research due to its stable isotopic label. Suitable for Fourier transform infrared (FTIR) spectroscopy when deuterium compatibility is required.