Table 2.
Important IR spectral data (cm−1) of Schiff bases and their corresponding organosilicon(IV) complexes.
| Compounds | ν (OH) | ν (C=N–) | ν (C=O) | ν (COO)asym | ν (COO)sym | Δν | ν (Si←N) | ν (Si–O) |
|---|---|---|---|---|---|---|---|---|
| L1H | 3,090–2750 br | 1625 s | 1,720 s | — | — | — | — | — |
| Me3SiL1 | — | 1610 m | 1722 m | 1588 vs | 1322 m | 266 | 570 m | 425 m |
| L2H | 3105–2790 br | 1635 s | 1730 s | — | — | — | — | — |
| Me3SiL2 | — | 1622 s | 1729 s | 1595 vs | 1320 s | 275 | 550 w | 430 m |
| L3H | 3090–2750 br | 1625 s | 1720 s | — | — | — | — | — |
| Me3SiL3 | — | 1614 s | 1720 s | 1604 s | 1332 s | 272 | 555 s | 420 w |
| L4H | 3090–2740 br | 1620 s | 1728 m | |||||
| Me3SiL4 | 1608 m | 1726 m | 1590 s | 1318 m | 272 | 550 m | 428 m | |
| L5H | 3108–2795 br | 1630 s | 1725 s | — | — | — | — | — |
| Me3SiL5 | — | 1615 s | 1724 s | 1594 s | 1324 s | 270 | 568 m | 429 s |
| L6H | 3090–2740 br | 1620 s | 1728 s | — | — | — | — | — |
| Me3SiL6 | — | 1609 s | 1730 s | 1600 s | 1324 m | 276 | 558 m | 427 w |
| L7H | 3110–2750 br | 1622 s | 1735 s | — | — | — | — | — |
| Me3SiL7 | — | 1611 s | 1732 s | 1597 vs | 1322 s | 275 | 560 w | 425 w |
| L8H | 3100–2740 br | 1625 s | 1730 m | — | — | — | — | — |
| Me3SiL8 | — | 1610 m | 1732 s | 1592 s | 1320 m | 272 | 565 m | 435 m |
br: broad, vs: very sharp, v: sharp, m: medium, and w: weak.