Intermolecular Interactions between Eosin Y and Caffeine Using ¹H-NMR Spectroscopy

Table 1

The ¹H-NMR chemical shifts (𝛿) in ppm of eosin Y aromatic protons in the samples of eosin Y alone compared to eosin Y-caffeine mixture.

Sample	H𝑎	H𝑏	H𝑐	H𝑑	H𝑒	H𝑓
Eosin Y	7.47	7.47	7.16	7.60	7.66	7.80
Eosin Y + caffeine	7.51	7.51	7.32	7.67	7.74	7.83