INTERACTION OF PYROPHOSPHATE ION WITH DI-AMINES, TRI-AMINES AND TETRAAMINES IN AQUEOUS-SOLUTION - A POTENTIOMETRIC AND CALORIMETRIC STUDY



: LABADI I, JENEI E, LAHTI R, LONNBERG H

Publisher: MUNKSGAARD INT PUBL LTD

: 1991

Acta Chemica Scandinavica

ACTA CHEMICA SCANDINAVICA

: ACTA CHEM SCAND

: 45

: 10

: 1055

: 1059

: 5

: 0904-213X

DOI: https://doi.org/10.3891/acta.chem.scand.45-1055


Successive macroscopic pK(a) values have been determined potentiometrically for the conjugate acids of spermidine (4-azaoctane-1,8-diamine), spermine (4,9-diazadodecane-1,12-diamine) and some acylic diamines at various ionic strengths in the absence and presence of tetrasodium pyrophosphate. The stability of the amine/pyrophosphate adducts have been estimated on the basis of effects of the pyrophosphate ion on the apparent acidity constants of the amines. Stoichiometry and thermodynamics of adduct formation have been elucidated from microcalorimetric measurements.



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