Going to the Security Council will certainly not make Iran go back on research and development.
Referring Iran's file to the Security Council won't change the Iranian stance about uranium enrichment. It serves no one's interest.
If Iran's case is referred or reported to the Security Council Iran's co-operation will decrease.
If they set a deadline, it will, from Iran's point of view, make no difference from being referred to the U.N. Security Council and Iran will react in the same manner.