Shift of nuclear clock transition frequency in Th229 ions due to hyperfine interaction

We calculate the hyperfine structure of $^{229}\mathrm{Th}$ and its ions (Th iv, Th iii, Th ii, Th i) to reveal the dependence of the nuclear clock frequency on the hyperfine interaction (HFI). We calculate first- and second-order HFI shifts and demonstrate that due to the differences in the hyperfine structure for different ions and for the ground and isomeric nuclear states the nuclear frequencies in Th iv, Th iii, Th ii, and Th i are also different. The first-order shift of frequency is large for a particular hyperfine component, but it vanishes after averaging over all hyperfine states. The second-order shift is small but it does not vanish after averaging. It is 3 to 6 orders of magnitude smaller than the shift of the nuclear frequencies due to the Coulomb electron-nucleus interaction considered in our previous work (V. A. Dzuba and V. V. Flambaum, arXiv:2309.11176.). However, it is 6 to 8 orders of magnitude larger than the projected accuracy of the nuclear clock $({10}^{\ensuremath{-}19})$.