title: Distinguishable Zn(II) and Pb(II) template effects on forming pendant-armed Schiff-base macrocyclic complexes including a remarkable Pb(II)-π macrocyclic complex.
abstract: 36-Membered [2 + 2] half-fold Schiff-base macrocyclic dinuclear Zn(II) complexes (1a and 1b) and 18-membered [1 + 1] Schiff-base macrocyclic mononuclear Pb(II) complexes (2 and 3) are produced from the condensation between 1,3-propanediamine and a pair of extended dialdehydes with different functional pendant arms (H2hpdd and H2pdd) because of the distinguishable cationic template effects. It is very interesting to mention that a unique intramolecular Pb(II)-π macrocyclic complex 2 with an uncommon η(3)-coordination type is achieved under ambient conditions and it can remain stable both in the solid state and in solution. The subtle variations of pendant-arms in the macrocyclic ligands H2hpdd and H2pdd yield different Pb(II) complexes, where the competition between Pb(II)-π and Pb(II)-NO3(-) electrostatic interactions as well as the combination of steric and electronic effects of pendant arms are believed to play important roles.
authors.affiliation: State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China. whuang@nju.edu.cn.
authors.forename: Kun
authors.initials: K
authors.lastname: Zhang
authors.forename: Jiao
authors.initials: J
authors.lastname: Geng
authors.forename: Chao
authors.initials: C
authors.lastname: Jin
authors.forename: Wei
authors.initials: W
authors.lastname: Huang