Visible Spectra of Anhydrous Co(Ll) Chloride in Anhydrous Formic Acid

Fathia M. Helmy

Department of Chemistry, College of Girls, Al-Bagdadeya Madaris Street, Jeddah, (Kingdom of Saudi Arabia)

ABSTRACT:

Coordination chemistry of Co(ll) chloride dissolved in non aqueous formic acid in a series of concentrations upto very dilute solutions at 30°C are studied. The complexes have been detected by the changes in colour from blue to pink or vice versa. In general, the complexes of Co(ll) in most solvents are characterized by colour of solutions as well as by the shape and band maxima of the visible spectra. The visible spectra of the blue colour solutions indicate the presence of trichioro tetrahedral complex [CoCI3(HCOOH ] only. There is no evidence for the presence of dichloro complex [CoCI2(HCOOH)2] and the tetrachloro complex [CoCI4]2. The visible spectra of the pink colour solutions indicate the presence of octahedral complexes through their band maxima accompanied by extinction coefficient higher than the normal due to the overlapping of the band maxima of both tetrahedral and octahedral complexes. Also these complexes detected through a broad isobestic point at the band maximum which defined the octahedral complex formations. The interrelation between different complexes may be formed with the change in concentration is suggested.

KEYWORDS:

concentrations; octahedral complexes; extinction

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Copy the following to cite this article: Helmy F. M. Synthesis and Structural Studies of Some Mixed Ligand Transition Metal Complexes of Histidine and Adenine or Guanine. Orient J Chem 2000;16(1).

Copy the following to cite this URL: Helmy F. M. Synthesis and Structural Studies of Some Mixed Ligand Transition Metal Complexes of Histidine and Adenine or Guanine. Orient J Chem 2000;16(1). Available from: http://www.orientjchem.org/?p=36292