Thermochemical study of the stepwise protonation of 3-azaheptane-1,7-diamine and 4-azaoctane-1,8-diamine, and of complex formation between copper(II) and 3-azaheptane-1,7-diamine and 4,9-diazadodecane-1,12-diamine
- 1 January 1976
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 3,p. 230-233
- https://doi.org/10.1039/dt9760000230
Abstract
Calorimetric enthalpy data [at 25 °C and I= 0.1 mol dm–3(NaCl)] are reported for stepwise protonation of the tribasic ligands 3-azaheptane-1,7-diamine (3NH-hd) and 4-azaoctane-1,8-diamine (4NH-od, spermidine) and for the formation of the copper complexes [CuL]2+, [Cu(HL)]3+, and [Cu(OH)L]+(L = 3NH-hd) and [CuL]2+ and [Cu(HL)]3+[L = the tetrabasic ligand 4,9-diazadodecane-1,12-diamine (4,9NH-ddd, spermine)]. By comparison with data for homologous linear triamines and tetra-amines, the relative importance of enthalpy and entropy terms in stabilising large chelate rings is assessed.Keywords
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