Diamagnetic Susceptibilities of Various Inorganic Phosphates and Organic Phosphate Esters

Abstract

Abstract The diamagnetic susceptibilities of various inorganic phosphates as well as various organic phosphate esters, such as ATP, ADP, and phosphocreatine, were determined by Gouy’s method. The diamagnetic susceptibility of H3PO4 was estimated to be −43.5 × 10−6 cm3 mol−1 from plots of the diamagnetic susceptibility against the total number of electrons in the cation by measuring various inorganic phosphates. The free-energy changes (ΔG’s) for the hydrolysis of the phosphate ester were found to correlate with the differences in the diamagnetic susceptibilities between the phosphate esters and their products of hydrolysis. The diamagnetic susceptibility of :PO3H2 was obtained to be −28—39 × 10−6 cm3 mol−1, which decreased with increasing ΔG.