The output I get via "echo" works as a command when pasted to terminal, but not in the script

I'm trying to change the files generated by an app that unfortunately often contain spaces. I have managed to get "echo" to give me output that works if copy pasted into terminal, but when I try to do the command, it does not work. I looked at this answer, which has helped me before, but even this "${x}" syntax does not seem to work, in this case.

#!/bin/sh
cd ~/Data
IFS=$'\n';for i in $(ls); do
    echo "$i";
    filename="$i"
    date=$(date -n +%Y-%m-%d)
    new_filename="$date$filename"
    echo mv \'"${filename}"\' \'"${new_filename}"\'
    mv \'"${filename}"\' \'"${new_filename}"\'
done;