134662-33-2Relevant academic research and scientific papers
Synthesis and characterization of the branched azacage 12-methyl-17-pentyl-1,5,9,12,17-pentaazabicyclononadecane. Basicity and Copper(II) complex
Micheloni, Mauro,Nardi, Nicoletta,Valtancoli, Barbara
, p. 29 - 31 (2007/10/02)
The synthesis and characterization of the new branched azacage 12-methyl-17-pentyl-1,5,9,12,17-pentaazabicyclononadecane, L, is reported.The basicity behaviour in aqueous solution (I=0.15, NaCl; 25 deg C) has been investigated by potentiometry.The cage (L) can take up three protons.It behaves as a strong base 1=11.40(4)> in the first protonation step, as a moderate base in the second step 2=7.67(4)>, and as weak base in the third protonation step 3=3.3(1)>.The influence of the lateral hydrocarbon chain on the proton-transfer properties is discussed.The solid complex (ClO4)2 has been isolated whose electronic spectrum is diagnostic of a distorted square pyramidal structure both in the solid state and in solution.The copper complex shows a great inertness toward dissociation in strong acid solutions, which proves the incapsulation of the copper(II) ion in the cage cavity
