Access count of this item: 1455

Files in This Item:
File Description SizeFormat 
rpcjpnv44p011.pdf2.2 MBAdobe PDFView/Open
Title: Pressure effects on the complexes of cobalt (II) chloride and cobalt (II) bromide in acetone solution
Authors: Ishihara, Izumi
Hara, Kimihiko
Osugi, Jiro
Issue Date: 30-Sep-1974
Publisher: The Physico-Chemical Society of Japan
Journal title: The Review of Physical Chemistry of Japan
Volume: 44
Issue: 1
Start page: 11
End page: 24
Abstract: The acetone solutions of cobalt(II) chloride and cobalt(II) bromide are blue under atmospheric pressure at room temperature and in both of them the main species is tetrahedrally coordinated CoX_2(Ac)_2, where Ac denotes an acetone molecule and X is Cl or Br. The visible absorption spectra of cobalt(II) chloride and cobalt(II) bromide in acetone solution measured under pressures up to 8, 000kg/cm^2 at room temperature showed that the following two kinds of equilibria coexist : CoX_2(Ac)_2 + 4Ac ⇌ Co(Ac)_6^2^+ + 2X^-, (I) CoX_2(Ac)_2 + X^- + ⇌ CoX_3(Ac)^- + Ac. (II) The value of ΔV_1, the volume change of equilibrium (I), is large with the negative sign and changes greatly with increasing pressure. |ΔV_2|, the absolute value of the volume change of equilibrium (II), is small and scarcely depends on pressure. These experimental results indicate the nature of equilibrium (I) and eqilibrium (II): in equilibrium (I) the ionic species are formed and the coordination number increases by the shift to the right side, and in equilibrium (II) there is no change in the number of the charged species and in the coordination number on both sides. In addition, ΔV_1 was estimated from the change of the intrinsic volume, the free volume and the effect of electrostriction.
URI: http://hdl.handle.net/2433/46994
Appears in Collections:Vol.44 No.1

Show full item record

Export to RefWorks


Export Format: 


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.