Proton-lithium binding behavior of tris(2-((pyrid-2-ylmethyl)uredio)ethyl)amine.
Tris(2-((pyrid-2-ylmethyl)uredio)ethyl)amine (2) and its perchlorate salt, 2.HClO(4), bind with Li+ in nitromethane in a 1:1 fashion. The stability constants of K(Li+) and K(H)(Li+) were found to be 112 +/- 25 and 130 +/- 30 M(-)(1) in CD(3)NO(2), respectively. Formation of the 1:1 complexes were further evidenced by electrospray ionization mass spectrometry (ESI-MS). The slight increase, or at least the same order of magnitude, of K(H)(Li+) compared to K(Li+) points to a remarkable preorganization of the protonated podand in 2.HClO(4), that essentially overcomes the increased Columbic repulsion occurring on complexation to Li+.
Liao
C F
CF
Department of Chemistry, Soochow University, Taipei, Taiwan, R.O.C.
Lai
J L
JL
Chen
J A
JA
Chen
H T
HT
Cheng
H L
HL
Her
G R
GR
Su
J K
JK
Wang
Y
Y
Lee
G H
GH
Leung Mk
Wang
C C
CC