Novel Organotin(IV) Schiff Base Complexes with Histidine Derivatives: Synthesis, Characterization, and Biological Activity
Table 2
13C and 119Sn NMR data of compounds 1–5.
Compound numbering
1 CDCl3
2 CDCl3
3 CD3OD
4 CDCl3
5 Solid state
C11
174.33
174.54
177.66
167.57
166.6
C13
173.72
173.72
175.79
175.62
176.6
C2
166.59
167.0
168.61
158.13
157.55
C1
141.29
140.96
143.61
140.00
a
C4
139.04
138.64
142.00
136.67
a
C6
135.70
135.67
134.63
134.09
a
C5
133.19
133.08
132.97
127.16
a
C17
131.08 (b)
131.30 (b)
132.64 (b)
131.98 (b)
—
C3
129.49
129.47
129.95
126.24
a
C19
119.78 (b)
119.84 (b)
118.00 (b)
123.69 (b)
120.2
C15
116.61
116.51
119.66
117.98
117.5
C12
67.18
67.42
68.56
72.02
64.0
C7
35.27
35.19
35.45
35.08
34.68
C9
34.06
33.93
34.17
34.16
33.86
C14
33.97
33.90 (b)
33.98
29.50 (b)
29.5
C8
31.23
31.10
30.56
31.54
31.0
C10
29.44
29.36
29.47
29.50
29.2
CH3
1.23, 0.933 [653/648]
27.00 [38] 26.85 [n.o.]
28.07 [24]
26.74 [91] 26.56 [92]
27.02 [72/70]
22.26 [599] 22.20 [599]
17.73 [435/415]
13.59 13.39
13.66
Ci
142.67 [n.o.] 141.27 [n.o.]
a
Co
137.78 [53] 137.32 [53]
a
Cm
130.54 [87] 130.23 [83]
a
Cp
132.12 [n.o.] 131.64 [16]
a
119Sn
−162.16 CDCl3
−197.58 CDCl3
−369 CD3OD
39.44 CDCl3
No soluble
119Sn Solid state
−169.50
−196.68
−455.87
−112.59
−122.09
Chemical shifts in ppm with respect to TMS; 119Sn chemical shifts in ppm with respect to (CH3)4Sn; (13C–119/117Sn) coupling constants between square brackets. n.o.: not observed. a: Unambiguous assignment of this resonance peak was not reached because there are multiple broad signals included in the range 143–127 ppm.
