Tin(IV) Complexes of Schiff Base Derived from Amino Acid: Synthesis and Characteristic Spectral Studies

Table 3

NMR spectra of complexes (in δ).

S. no.^a	Complex	Azomethine proton	Methylene proton	Naphthylidene group proton
1	[Sn(L-1)(Opr^𝑖)2]	9.16 (s,1H)	4.29 (s, 2H)	6.91–7.92 (m, 6H)
2	[Sn(HL-1)2(Opr^𝑖)2]	9.12 (s, 2H)	4.24 (s, 4H)	6.89–7.88 (m, 12H)
3	[Sn(L-2)(Opr^𝑖)2]	8.34 (s, 1H)	3.58 (s, 2H)	6.93–7.93 (m, 6H)
4	[Sn(HL-2)2(Opr^𝑖)2]	8.30 (s, 2H)	3.56 (s, 4H)	6.92–7.90 (m, 12H)

^aNumbers as indicated in Table 3; s: singlet; m: multiplet.