Table 1. Physical Properties, UV–Vis, Conductivity, Magnetic, and FT-IR Results.
| Az | CrAz2 | MnAz2 | FeAz2 | ||
|---|---|---|---|---|---|
| physical properties | color | brown–red | white–green | white yellow | dark-violet |
| melting point (°C) | 190–191 | >300 | >300 | >300 | |
| yield (%) | 97 | 90 | 87 | 89 | |
| conductivity μv, Ω–1 cm2 mol–1 | Acetonitrile | 11.78 | 12.04 | 11.44 | |
| DMF | 10.15 | 9.48 | 10.07 | ||
| assignment | Non-electrolyte | ||||
| UV–vis | λmax, nm | 380 | 615 | 410 | 505 |
| magnetic | μeff (B.M) | 3.84 | 1.96 | 1.84 | |
| assignment | d3 (t2g3) | d5 low spin (t2g5) | d5 (t2g5) | ||
| stoichiometry | M:L | 1:2 | 1:2 | 1:2 | |
| IR spectra | υ (−OH) | 3318 | 3478 | 3488 | 3460 |
| υ (−N=N) | 1542 | 1464 | 1460 | 1470 | |
| υ (M–O) | 551 | 547 | 544 | ||
| υ (M–N) | 485 | 478 | 484 | ||
| EA found (calc.) % | C | 72.62 (72.72) | 60.47 (60.81) | 62.53 (62.24) | 60.28 (60.45) |
| H | 4.41 (4.55) | 3.55 (3.83) | 4.66 (4.24) | 3.66 (3.80) | |
| N | 10.71 (10.60) | 8.69 (8.86) | 8.87 (9.07) | 8.62 (8.81) | |
| M | 8.54 (8.23) | 8.72 (8.90) | 8.99 (8.78) | ||