IR characteristic band for L and C1–C6 complexesa.
| Complexes | ν OH COOH, H2O | ν OH H2O | ν COO− asym | ν COO− sym | ν C–O | ν C–N | ν Sm–N | ν Sm–O |
|---|---|---|---|---|---|---|---|---|
| L | 3438(b) | — | — | — | 1618(s) | — | — | — |
| C1 | — | 3445 (b) | 1581(m) | 1368(s) | 1628(s) | — | — | 489 (w) |
| C2 | — | 3450 (b) | 1580(m) | 1375(s) | 1629(s) | 1524 (w) | 545 (w) | 492 (w) |
| C3 | — | 3449 (b) | 1577(m) | 1371(s) | 1627(s) | 1525 (w) | 531 (w) | 489 (w) |
| C4 | — | 3451 (b) | 1579(m) | 1368(s) | 1626(s) | 1526 (w) | 540 (w) | 493 (w) |
| C5 | — | 3442 (b) | 1580(m) | 1370(s) | 1625(s) | 1525 (w) | 555 (w) | 495 (w) |
| C6 | — | 3452 (b) | 1582(m) | 1364(s) | 1628(s) | 1528 (w) | 560 (w) | 494 (w) |
a
(b) broad, (m) medium (s) sharp (w) weak.