The partial molal volume of two nickel chelate complexes

Abstract

Partial molal volumes have been determined for the nickel(II) complexes of ethylenediaminetetraacetic acid (mono complex) and methyliminodiacetic acid (bis complex). The formation of these is accompanied by appreciable increases in volume, greater in the case of the second ligand. The observations are discussed in terms of reduced electrostriction of water by the complexes, and the different volume increases are accounted for by structural features of the complexes which are partially confirmed by spectral measurements.