map Ctrl with special characters

I still have problems mapping keys.

On my keyboard I have these keys I want to map:
<C-ò>
<C-à>
<C-è>
<C-ù>
<C-ì>

Tony once told in a message these info:
ò = (0xF2, o-grave) and <M-r> (Alt+0x72, Alt-r)
à = (0xE0, a-grave) and <M-`> (Alt+0x60, Alt-backtick)
è = (0xE8, e-grave) and <M-h> (Alt+0x68, Alt-h)
ù = (0xF9, u-grave) and <M-y> (Alt+0x79, Alt-y)
ì = (0xEC, i-grave) and <M-l> (Alt+0x6C, Alt-l)

But how to combine these letters to the Ctrl key?

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