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The  35 Cl and  79,81 Br NQR spectra of (C 5 H 5 ) 2 M Hal 2  (M = Ti, Mo, W, Zr, Hf; Hal = Cl, Br) are similar. They are quadruplets with splittings ranging from 2 to 7%. The averaged frequencies of chlorine and bromine are related by a linear dependence. The temperature dependence of  81 Br in Cp 2 HfBr 2  (in the range of 77 ≑ 224 K.) is of conventional character with frequencies slowly changing with temperature; phase transitions have not been observed.

35 Cl and 79 Br NQR Spectra in Cp 2 M Hal 2