ISSN:
0018-019X
Schlagwort(e):
Chemistry
;
Organic Chemistry
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The protonation and deprotonation rates of the coordinated amide groups in the Ni2+ and Cu2+ complexes of 3,7-diazanonanediamide (DANA) and in the Cu2+ complex of 3,7-diazanonane-N,N′-diethylamide (DANEA) have been studied by stopped-flow techniques. For the interconversion M(H-2L) ⇌ ML, two consecutive reactions are observed in the case of Cu2+ with DANA or DANEA, whereas there is only one reaction for Ni2+ with DANA. Cu(H-2DANEA) is unusually labile, indicating a strong interaction between the N-ethyl groups. The conversion of the O- into the N-coordinated amide groups in NiDANA2+ is 25 times slower than in CuDANA2+. In the case of Ni2+ this excludes a step with water substitution, which is involved in one of the reaction paths observed for the Cu2+ complexes, since the rates of water exchange differ by a factor of 105 for the two metal ions.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/hlca.19740570702
