So, even if the candidate has a negative experience of communication with a particular company, you can contact them if you need a specialist of that field to another firm.
The ability to complete negotiations, though not reaching an agreement, will be a good foundation for the next meeting, which could end in "win-win" way: a recruiter, choosing the right strategy of communication with the candidate in the past, will fill a new job opening, and the candidate will be able to work in another company and receive positive experience.