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Thermodynamik der Metallkomplexbildung mit Polyoxadiazamacrocyclen
Author(s) -
Anderegg Giorgio
Publication year - 1975
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19750580427
Subject(s) - chemistry , standard enthalpy change of formation , enthalpy , standard enthalpy of formation , exothermic reaction , complex formation , medicinal chemistry , thermodynamics , inorganic chemistry , organic chemistry , physics
Ligands of the type H 3‐n N(CH 2 CH 2 OCH 2 CH 2 OCH 2 CH 2 ) n NH 3−n with n values from 1 to 3 have been investigated. The stability constants and the heat evolved by formation of the 1:1 complexes of Na + , K + , Rb + , Tl + , Ca 2+ , Sr 2+ , Ba 2+ , Cd 2+ , Ag + , Hg 2+ and Pb 2+ have been determined. The complex formation is discussed in terms of ΔH and ΔS taking into consideration the radii of the cations. In contrast with the normal trend, for the A cations, complex formation is exothermic and almost exclusively favoured by the reaction enthalpy.