Treatment of TiCl₄ with 4 equivalents of NaCp gives a single organometallic compound (together with NaCl byproduct). At room temperature the ¹H-NMR spectrum shows a single sharp singlet; on cooling to −40°C this singlet separates into two singlets of equal intensity; further cooling results in one of the singlets separating into three signals with intensity ratios 1:2:2. Explain these results.