Synthesis, Characterization, Semiempirical and Biological Activities of Organotin(IV) Carboxylates with 4-Piperidinecarboxylic Acid

Table 3

¹H NMR data^a of organotin complexes 1–5.

	Proton number	Chemical shift (ppm)
		HL	1	2	3	4	5
	1	2.32–2.41m	2.74–2.81m	2.90–2.96m	2.61–2.65m	2.36–2.43m	2.73–2.81m
	2, (a)	1.83–1.89m	1.82–1.98m	1.86–1.90m	1.85–1.93m	1.78–1.88m	1.80–1.97m
	2, (e)	2.12–2.17m	2.11–2.19m	2.11–2.18m	2.12–2.17m	2.05–2.11m	2.08–2.21m
	3, (a)	2.74–2.79m	3.05–3.13m	2.88–2.92m	3.07–3.12m	2.97–3.05m	3.01–3.13m
	3, (e)	3.23–3.35m	3.36–3.41m	3.15–3.22m	3.35–3.38m	3.32–3.35m	3.35–3.43m
	4	2.50s	2.58s	2.52s	2.57s	2.59s	2.58s
Sn–R			0.78s 90	1.19–1.37m	—	0.4s 52	—
			—	1.59–1.61m	7.85–7.89m	—	7.81–7.88m
			—	1.40–1.56m	7.35–7.49m	—	7.42–7.52m
			—	0.89t (7.2)	7.51–7.59m	—	7.50–7.62m

 ¹¹⁹Sn, ¹H and (¹H, ¹H) are listed in square brackets and parenthesis, respectively; multiplicity is given as s: singlet, t: triplet, and m: multiplet.
See Scheme 1.