title: Proton-lithium binding behavior of tris(2-((pyrid-2-ylmethyl)uredio)ethyl)amine.
abstract: 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+.
authors: Department of Chemistry, Soochow University, Taipei, Taiwan, R.O.C.
authors: C F
authors: CF
authors: Liao
authors: J L
authors: JL
authors: Lai
authors: J A
authors: JA
authors: Chen
authors: H T
authors: HT
authors: Chen
authors: H L
authors: HL
authors: Cheng
authors: G R
authors: GR
authors: Her
authors: J K
authors: JK
authors: Su
authors: Y
authors: Y
authors: Wang
authors: G H
authors: GH
authors: Lee
authors: Leung Mk
authors: C C
authors: CC
authors: Wang