There are a bunch of journals like that. If you google "Journal of Negative Results", you will see several for different fields.
However, for some I know, it's really difficult to get in, because there are many more journals of positive than negative results, and there are probably many more negative results than positive... so your negative result had better be especially interesting.
However, for some I know, it's really difficult to get in, because there are many more journals of positive than negative results, and there are probably many more negative results than positive... so your negative result had better be especially interesting.