Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry p. 1501 - 1523 (1999)
Update date:2022-09-26
Topics:
El-Ansary
Sherif
El-Ajily
Metal chelates of the divalent transition metal ions Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) with 8-(arylazo)chromones have been prepared and characterized by elemental analyses, IR and electronic spectra, thermogravimetric analyses, magnetic and conductance measurements The obtained data suggest the formation of 1:1 and 2:1 (M:Ligand) chelates with the general formula [MHk-1LXm(H2O)n].yH2O or [M2Hk-2LXm(H2O)n].yH 2O where X = OH or Cl, m = 1 or 2, n = 1-3 or 6, y = 1-3 or 5, k = 2-4, M is a divalent transition metal ion and HkL represents the 8-(arylazo)-chromones. The study revealed that the ligands behave as monobasic bidentates in the case of 1:1 (M:Ligand) chelates and as dibasic tetradentates in the case of the 2:1 (M:Ligand) chelates. Electronic spectra and magnetic measurements indicate that the metal chelates have square-planar, tetrahedral or octahedral geometries. The TG analyses indicate the presence of hydrated and coordinated water molecules. A nonelectrolytic nature was assigned based on molar conductance measurements.
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