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Abstract
The coordination characteristic of diacetylmonoxime thiosemicarbazone {IUPAC name (E)-2-(E)-3-(hydroxyimino)butan-2- ylidene)-hydrazinecarbothioamide} (H2L) towards Ag(I), Fe(III), Co(II), Ni(II), and Cu(II) individually and in combination with Ag(1) has been studied. The prepared complexes are characterized by microanalysis, thermal, magnetic and spectral (IR, 1H NMR, ESR, and electronic) studies. Ag(1) plays an important role in the complex formation. The ligand chelates as: i) neutral in [Ag(H2L)(H2O)]·NO3·H2O, [Ag2(H2L)2]·2NO3·H2O and [Ag2(H2L)(OH)]·NO3; ii) monobasic in [Co(HL)2]·EtOH, [Fe(HL)2]·NO3, [FeAg2(HL)2(NO3)2]·NO3, and [Cu2(HL)2 (EtOH) (NO3)]·NO3·EtOH and iii) dibasic molecule in [Ni(L) (EtOH)], [NiAg2(L)2(EtOH)], [NiAg2(L)(H2O)2]·2NO3, [Cu2Ag2 (L)2(H2O)(NO3)]·NO3 and [Cu2Ag2(L)(H2O)3(OAc)2(NO3)]·NO3· H2O. The variation in coordination may be due to the presence of two different metal ions and the preparation conditions. The inside and outside nitrates are investigated by IR spectra; the ionic by a strong band at ≈ 1380 cm−1 and the coordinated by bands at ≈ 1434 and ≈ 1211 cm−1. The outer sphere solvents are detected by IR and thermal analysis.