DETAILED STRUCTURAL-X-RAY STUDY OF (BETAINE PHOSPHATE)(1-X) (BETAINE PHOSPHITE)(X) COMPOUNDS

We have determined the structure of a series of mixed compounds BP1-xB PIx of betaine phosphate (BP) and betaine phosphite (BPI) at room temp erature through single crystal X-ray diffraction measurements. In agre ement with previous studies the observed symmetry for all studied conc entrations was P2(1)/c. The evolution of the structure as a function o f BPI content and the behaviour of the unit cell parameters a and b as a function of x are analyzed. A calculation of the electric dipolar m oment of the H3PO4 tetrahedron was effectuated as a function of a and its relevancy is discussed. A comparison between the BPI concentration in the solution and in the crystal was also made along the series.