Research Article
Preparation and Characterization of Di-, Tri-, and Tetranuclear Schiff Base Complexes Derived from Diamines and 3,4-Dihydroxybenzaldehyde
Table 5
Electronic spectra, magnetic moments, and molar conductivity data of Schiff bases and their metal complexes.
| Symbol | Band positions (cm−1) | Assignment | (B.M) | Molar conductivity S·mol−1·cm2 in DMF |
| EDH4 | 33222, 24691 | π → π* | — | 0.0018 | PDH4 | 33222, 27777 | π → π* | — | 0.011 | 20833 | → π* | MPDH4 | 33333 | π → π* | — | 0.0007 | 27777 | → π* | C1 | 32362, 29154 | Intraligand π → π* | 0.386 oh | 0.022 | 23255 | C.T | 15431 |
2B1g → 2B2g | 13513 |
2B1g → 2A1g | C2 | 33444 | Intraligand π → π* | 0.514 oh | 0.251 | 26315 | C.T | 18868 |
2B1g → 2B2g | C3 | 33333 | Intraligand π → π* | 1.260 Sq. | 0.093 | 25641 | C.T | 15625 |
2B1g → 2B2g | 12658 |
2B1g → 2A1g | C4 | 37735, 34843 | Intraligand π → π* | 1.023 oh | 0.046 | 27247 | C.T | 23148 |
2B1g → 2Eg | 10989 |
2B1g → 2A1g | C5 | 34013, 27247 | Intraligand π → π* | 1.061 Sq. | 149 | 23313 | C.T | 16025 |
2B1g → 2B2g | C6 | 34129, 28571 | Intraligand π → π* | 0.810 oh | 0.114 | 25974 | C.T | 22883 |
2B1g → 2Eg | 10460 |
2B1g → 2A1g | C7 | 36363, 33333 | Intraligand π → π* | 2.440 oh | 0.043 | 31250 | | | | 26178 | C.T | | | 15731 |
4T1g → 4T1g (P) | | | 10504 |
4T1g → 4A2g | | | 7083 cal. |
4T1g → 4T2g | | | C8 | 34843, 33003 | Intraligand π → π* | 0.200 oh | 0.273 | 28248 | C.T | | |
15983. |
4T1g → 4T1g (P) | | | 9900 |
4T1g → 4A2g | | | 6456 cal. |
4T1g → 4T2g | | | C9 | 36363, 27247 | Intraligand π → π* | 1.092 Sq. | 0.0002 | 23310 | C.T | | | 19920 |
2B1g → 2Eg | | | 15313 |
2B1g → 2B2g | | | 10298 |
2B1g → 2A1g | | | C11 | 29585 | Intraligand π → π* | 2.017 Sq. | 0.005 | 26041 | C.T | | | 21739 |
2B1g → 2Eg | | | 15873 |
2B1g → 2B2g | | | C12 | 36496, 32894 | Intraligand π → π* | 1.023 oh | 0.013 | 27624 | C.T | | | 22935 |
2B1g → 2Eg | | | 10482 |
2B1g → 2A1g | | | C13 | 33333, 29239 | Intraligand π → π* | 0.440 | 163 | 27027 | C.T | | | 22472 |
2B1g → 2Eg | | | C14 | 34013, 29154 | Intraligand π → π* | 1.89 Sq. | 158 | 27027 | C.T | | |
18833. |
2B1g → 2B2g | | | C15 | 29325 | Intraligand π → π* | 1.783 oh | 0.023 | 27397 | C.T | | | 22727 |
2B1g → 2Eg | | |
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