Bromobenzene-d5 is a deuterated derivative of bromobenzene having an isotopic purity of 99.5 atom% D. Temperature dependent 1H-NMR (Proton Nuclear Magnetic Resonance) spectra of calixarenes (p-tert-butylcalix-[4]- and calix[8]arene) have been investigated in CDCl3 and bromobenzene-d5. Imaginary refractive indices, real refractive indices and other absorption quantities and imaginary molar polarizability spectra of liquid bromobenzene-d5 have been evaluated.Bromobenzene-d5 may be used in the preparation of orthoterphenyl-d10 (OTP-d10). Starting material used to prepare free radicals for ESR studies.