Research Article
Synthesis, Characterization, and Structural Assessment of Ni(II) Complexes Derived from Bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone
Table 3
Structurally significant infrared (IR) bands (in cm−1) for bis(2-hydroxy-1-naphthaldehyde)succinoyldihydrazone and its Ni(II) complexes.
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Serial number | Ligand/complex | ν(OH + NH) | ν(C=O) | ν(C=N) | Amide II + ν(C–O) (naphtholic) | ν(NCO−) | ν(C–O) | ν(N–N) | | ν(M–O) | Other bands |
| | | H4nsh | 3423 m
3244 m
3051 m | 1672 vs | 1633 vs
1593 m | 1540 m | — | 1281 m | 1029 w | — | — | — |
| | 1 | [Ni(H2nsh)(H2O)2] | 3410 m
3291 m | — | 1622 s
1604 m | 1540 s | 1508 w | 1306 m
1282 w | 1084 w
1039 w | — | 555 w
521 w | — |
| | 2 | [Ni(H2nsh)(py)2]·2H2O | 3419 m
3286 m | — | 1618 s
1604 m | 1540 s | 1507 w | 1303 m
1282 w | 1038 w | — | 521 w | 1052 w |
| | 3 | [Ni(H2nsh)(2-pic)2] | 3421 m | — | 1617 s
1602 m | 1540 s | 1508 w | 1303 m | 1038 w | — | 521 w | 1053 w |
| | 4 | [Ni(H2nsh)(3-pic)2]·2H2O | 3420 m | — | 1616 s
1602 m | 1540 s | 1506 w | 1303 m | 1038 w | — | 521 w | 1070 w |
| | 5 | [Ni(H2nsh)(4-pic)2] | 3435 s | — | 1617 s
1604 m | 1540 m | 1508 w | 1303 m | 1036 w | — | 522 w | 1045 w |
| | 6 | [Ni2(nsh)(H2O)4]·H2O | 3401 m
3055 m | — | 1618 s
1602 w | 1540 vs | 1508 w | 1302 m
1282 w | 1030 w | 897 w | 569 w
525 w | — |
| | 7 | [Ni2(nsh)(py)4]·4H2O | 3419 m
3051 m | — | 1617 vs
1602 s | 1540 vs | 1508 w | 1303 m
1283 w | 1093 w | 882 w | 595 w
528 w | 1069 w |
| | 8 | [Ni2(nsh)(2-pic)4]·4H2O | 3421 m
3055 m | — | 1617 vs
1602 vs | 1540 vs | 1508 w | 1302 m
1281 w | 1093 w
1032 w | 883 w | 589 w
567 w | 1076 w |
| | 9 | [Ni2(nsh)(3-pic)4]·4H2O | 3409 m
3051 m | — | 1617 vs
1602 vs | 1541 vs | 1508 w | 1302 m
1282 w | 1049 w
1003 w | 862 w | 585 w
532 w | 1061 w |
| | 10 | [Ni2(nsh)(4-pic)4]·4H2O | 3398 m
3050 z | — | 1617 vs
1602 vs | 1541 vs | 1508 w | 1302 m
1282 w | 1094 w
1030 w | 861 w | 570 w
528 w | 1070 w |
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