Does a divorce take place if a man says to his wife: "You are divorced if you do not say such and such, or if you do such and such," and then sleeps with her after she has acceded to his request?

It is understood from the question that you swore an oath of divorce that you would not sleep with your wife unless she said a specific phrase, and she said it a day later. Accordingly, if you intended her to say it immediately or within a period of less than a day, then your wife is divorced by you sleeping with her. However, if you intended a longer period, or if you made no specific temporal intention, then the divorce has not occurred as long as she said what you requested. It is advisable to refer to the Sharia court or scholars for a ruling on the matter, while noting that swearing by divorce is impermissible.