Abstract
A number of crystalline metal perchlorate complexes with diisopropyl methylphosphonate (DIMP) were synthesized and found to be of the general type [M(DIMP) 4]ClO 4) 2 for divalent metal ions. Conductance measurements indicate the existence of the cation [M(DIMP) 4] 2+ in polar solvents. Higher-coordinated cationic complexes of DIMP with M(II) do not seem to exist because of steric hindrance from the bulky ligand molecules. I.R. data indicate that coordination to the metal ion occurs through the phosphoryl oxygen. I.R. evidence is also presented for the lowering of the symmetry of the perchlorate ion in the crystal lattice. The transition metal cationic complexes are assigned an intermediate between distorted tetrahedral and planar configuration, on the basis of magnetic and spectral evidence.
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