Speciation in solution: interaction between calixarene derivatives and lanthanides(III)

The importance of stability constant determination for the calculation of speciation diagrams is illustrated through several examples pertaining to the coordination chemistry in solution of trivalent lanthanides with chemically modified calixarene derivatives substituted either at the wide or the narrow rim by carboxylic acid, glycine or CMPO moieties. The influence of the analytical composition of the systems investigated is particularly analyzed.

Evaluation of Transannular Interaction of [2.3] Metacyclophane-diazonium Tetrafluoroborate and its Dediazoniated Derivatives

Transannular interactions of [2,3] metacyclophane-diazonium tetrafluoroborate and its dediazoniated derivatives have been evaluated by 1H NMR, IR, UV and stability constant determination.

The stabilities of secondary tin minerals. Part 2: The hydrolysis of tin(II) sulphate and the stability of Sn3O(OH)2SO4

Tritin(II)dihydroxyoxosulphate, Sn3O(OH)2SO4, is a rare corrosion product found on the surfaces of certain tin alloys. A new synthesis based on the hydrolysis of SnSO4 is described. The stability constant determination of Sn3O(OH)2SO4,s, at 298.2K and 105Pa is determined using direct measurements via electrodes, of the activities of tin(II) and sulphate ions. ΔfG0(298.2K) is equal to −1563.1 ± 0.9 KJ mol−1.