Unable to map Ctrl-`

I am trying to map Ctrl-` in nvim v0.7.0 but its not working.

Heres what I put in init.vim. The buffer 2 exists.

noremap <C-`> :split<CR><C-w><down>:buffer<space>2<CR>

Here is output of showkey -a for related keys:

Press any keys - Ctrl-D will terminate this program

`        96 0140 0x60    # from `
^@        0 0000 0x00    # from Ctrl+`
^@        0 0000 0x00    # from Ctrl+2

My terminal is Konsole and here is the output of echo $TERM


I don’t think Konsole supports sending this key.