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. 2022 Jul 10;14(14):2812. doi: 10.3390/polym14142812

Table 2.

The FTIR absorption bands of complexes 1–4.

Complex. FTIR, Frequency (ν, cm−1)
C=O Carboxylate Group (COO−) Sn–C Sn–O
asym sym Δν
(asym − sym)
1 1680 1622 1426 196 540 440
2 1685 1614 1383 231 559 472
3 1682 1651 1466 185 553 461
4 1682 1620 1449 171 532 463