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The temperature dependence of the  81 Br NQR frequencies (v D ) for uncoordinated Br -  ions in trans-[CoBr 2 (en) 2 ] [D 5 O 2 ]Br 2 (D) has been determined by a continuous-wave spectrometer. v D  amounted to 16.200 MHz at 273 K. This is lower by 418 kHz than the  81 Br NQR frequency (v H ) for trans-[CoBr 2  (en 2 ] [H 5 O 2  ]Br 2  (H). The frequency difference (Δv = v H  -v D ) remained almost constant in the temperature range studied. A shortening of the O-H bond length caused by deuteration could explain the magnitude and the sign of Av on the basis of a point charge model calculation. The compounds D and H yielded 81Br NQR lines in the range 110-320 K and 90-343 K, respectively. As to the  59 Co NQR frequencies (7/2 - 5/2), the observed isotope frequency shifts (Δv 1  = v 1H  - v 1D ) between D and H were smaller than 5 kHz. Below 160 K,  59 Co resonances were only available by pulsed experiments.  59 Co NQR spin-lattice relaxation times T 1Q  of 0.54 ms at 194 K and 4.8 s at 77 K for H have been observed.

81 Br NQR for Uncoordinated Br ions in trans-[CoBr 2 (en) 2 ][H 5 O 2 ]Br 2 and trans-[CoBr 2 (en) 2 ] [D 5 O 2 ]Br 2