(Os(NH(sub 3)))(sub 4)(eta(super 2)), eta(super 1)-(CH(sub 2)) double bond CHCO(sub 2)H(sub 2)(super 2+): preparation, characterization, determination of acid-dissociation constants, and kinetics and mechanism of acid-catalyzed aquation

Nitrogen atmosphere helps prepare bis(acrylic acid)tetraammineosmium(II) bis(hexafluorophosphate). NMR spectrum and elemental analysis demonstrate the bis-substituted formulation. Acid-base titrations determine pKa values. Spectrophotometric measurements determine the rate of aquation. Magnetic susceptibility measurements reveal the paramagnetic nature of the products obtained in the acid catalyzed aquation.