Preparation and spectroscopic investigation of chelates of divalent transition metal ions with 8-(arylazo)-chromones

Article abstract of DOI:10.1080/00945719909351715

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 [MH_k-1LX_m(H₂O)_n].yH₂O or [M₂H_k-2LX_m(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 H_kL 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.

Full text of DOI:10.1080/00945719909351715

Synthesis and Reactivity in Inorganic and Metal-Organic
Chemistry
ISSN: 0094-5714 (Print) 1532-2440 (Online) Journal homepage: http://www.tandfonline.com/loi/lsrt19
Preparation and Spectroscopic Investigation of
Chelates of Divalent Transition Metal Ions with 8-
(Arylazo)-Chromones
A. L. El-Ansary , O. E. Sherif & M. M. El-Ajily
To cite this article: A. L. El-Ansary , O. E. Sherif & M. M. El-Ajily (1999) Preparation and
Spectroscopic Investigation of Chelates of Divalent Transition Metal Ions with 8-(Arylazo)-
Chromones, Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 29:9,
1501-1523, DOI: 10.1080/00945719909351715
To link to this article: http://dx.doi.org/10.1080/00945719909351715
Published online: 23 Apr 2008.
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Date: 02 March 2016, At: 11:57