
TY  - JOUR
A1  - Bottomley, GA 
A1  - Glossop, LG 
T1  - Apparent molar volumes for selected nitrogen base complexes of Co<sup>3+</sup>, Ni<sup>2+</sup> and Cu<sup>2+</sup> at 298 K
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1981
VL  - 34
IS  - 4
SP  - 699
EP  - 712
KW  - 
UR  - https://doi.org/10.1071/CH9810699 
N2  - The apparent molar volumes of aqueous solutions of seven alkyl diamines and two aromatic diamines, and 15 of their complexes with Co3+, Cu2+ and Ni2+ have been measured at 298 K over a wide concentration range down to 10-4 mol dm-3. Intercomparison is made of the ion, ligand and related complex limiting apparent molar volumes which follow an additive rule. The following pairs of complex ions, with similar geometric ionic radius and structure but of opposite charge, [Co(en)3]3+ and [Co(ox)3]3-, and [Co(ox)2(en)]- and [Co(en)2(ox)]+ (en = ethylenediamine, ox = oxalate), show similar apparent ionic volumes, and solvent electrostriction. Solutions of [Ni(en)3] Cl2 undergo considerable dissociation: the effective apparent molar volume is analysed in terms of known dissociation constants and additional volumetric data for the generated species. For the less dissociated [CO(NH3)6]Cl3, logK6 is estimated to be 5.5 from the volumetric data. 
ER  -

