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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 3, Number 1
BKCSDE 3(1)
January 20, 1982 

 
Title
Synthesis and Equilibria of Octahedral and Tetrahedral Complexes of Cobalt (Ⅱ) 2,2'-Dipyridylamine
Author
Myunghyun Paik Suh, Young-Hee Oh
Keywords
Abstract
Reactions of cobalt(Ⅱ) chloride with 2,2'-dipyridylamine (dpa) in alcoholic solutions afford the complex of octahedral Co(dpa)2Cl2· CH3OH. The octahedral complex is converted to tetrahedral Co(dpa)Cl2 in certain solvents or at the elevated temperature, and the tetrahedral complex is changed to the octahedral one with added dpa. The electronic spectra of the complexes in DMF, measured with various concentrations of 2,2'-dipyridylamine, establish the equilibrium; td-Co(dpa)Cl2 + dpa ↔(K) oh-Co(dpa)2Cl2. The equilibrium constants determined by the analysis of the visible spectra are 6.4, 3.6 and 2.0 M-1, respectively, at 25.5, 38.0 and 49.0 ℃, with Δ H°and ΔS°being -9.5 kcal/mole and -28 eu.
Page
5 - 9
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