Research Article
Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study
Table 2
Assignment of IR-bands of metal chelates of Schiff bases.
| | Compound | | | | | | ν cm−1 | | | | | | | M : L | νC=O | νC=N | νC–O | (NO3) | (NO3) | (NO3) | (NO3) | Free NO3 | νLn-N | νLn-O |
| | L1 | — | 1659 | 1625 | 1170 | — | — | — | — | — | — | — | | La L1·OH·4H2O·NO3·2H2O | 1 : 1 | 1650 | 1625 | 1185 | — | — | — | — | 1387 | — | 584 | | Nd L1·OH·4H2O·NO3·4H2O | 1 : 1 | 1650 | 1625 | 1185 | — | — | — | — | 1385 | — | 588 | | Er L1·OH·4H2O·NO3·H2O | 1 : 1 | 1650 | 1625 | 1186 | — | — | — | — | 1385 | — | 588 | | L2 | — | 1655 | 1617 | 1170 | — | — | — | — | — | — | — | | La L2·NO3·OH·C2H5OH·H2O·H2O | 1 : 1 | 1654 | 1626 | 1178 | 1453 | 1033 | 832 | 1334 | — | 451 | 554 | | Nd L2·NO3·OH·C2H5OH·H2O | 1 : 1 | 1654 | 1626 | 1179 | 1470 | 1033 | 832 | 1340 | — | 459 | 554 | | Er L2·NO3·OH·C2H5OH·H2O | 1 : 1 | 1654 | 1626 | 1179 | 1474 | 1033 | 832 | 1340 | — | 471 | 554 | | La2 L2·2NO3·OH·2C2H5OH·3H2O·NO3 | 2 : 1 | 1651 | 1627 | 1179 | 1454 | 1033 | 833 | 1334 | 1384 | 451 | 551 | | Nd2 L2·2NO3·OH·2C2H5OH·3H2O·NO3·H2O | 2 : 1 | 1651 | 1628 | 1179 | 1454 | 1033 | 833 | 1334 | 1384 | 451 | 555 | | Er2 L2·2NO3·OH·2C2H5OH·3H2O·NO3·3H2O | 2 : 1 | 1651 | 1628 | 1179 | 1454 | 1033 | 833 | 1334 | 1384 | 459 | 555 | | L3 | — | 1656 | 1632 | 1171 | — | — | — | — | — | — | — | | La L3·NO3·C2H5OH·2H2O | 1 : 1 | 1653 | 1557 | 1183 | 1474 | 1043 | 846 | 1324 | — | 423 | 551 | | Nd L3·NO3·C2H5OH·H2O·OH | 1 : 1 | 1647 | 1632 | 1180 | 1477 | 1032 | 845 | 1324 | — | — | 536 | | Er2 L3·2NO3·4H2O·2OH·H2O | 2 : 1 | 1645 | 1632 | 1186 | 1482 | 1030 | 847 | 1323 | — | — | 538 |
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