Compound

Chemical shift, (δ) ppm & Assignment

{S.S}

12.88 (s, 1H, OH)

11.85 (s, 1H, NH)

8.96 (s, 1H, CH=N)

6.96 - 7.83 (d, 8H, ArH)

1.68 (s, 3H, CH₃)

S.S-Ag

1:1

12.80 (s, 1H, OH)

NH absent

8.92 (s, 1H, CH=N)

6.82 - 7.71 (d, 8H, ArH)

1.61 (s, 3H, CH₃)

S.S-Cd

2-1

OH absent

11.89 (s, 2H, NH)

8.53 (s, 2H, CH=N)

6.69 - 7.88 (d, 16H, ArH)

1.70 (s, 6H, 2CH₃)

S.S-Pb

2:1

OH absent

11.82 (s, 2H, NH)

8.40 (s, 2H, CH=N)

6.54 - 7.66 (d, 16H, ArH)

1.62 (s, 6H, CH₃)