作者:Nancy L.S. Yue、Michael C. Jennings、Richard J. Puddephatt
DOI:10.1016/j.poly.2015.08.003
日期:2016.3
The coordination chemistry of palladium(II) with the bis(amidopyridine) ligands [LL = Ar(CONMe-4-C5H4N)(2), with Ar = 1,3-C6H4 (1), 5-t-Bu-1,3-C6H3 (2) and 2,5-C4H2S (3) has been investigated. The reaction of [PdCl2(NCPh)(2)] with the ligands in a 1:1 ratio gave the corresponding neutral binuclear macrocyclic complexes trans,trans-[Pd2Cl4(mu-LL)(2)] in all cases. The cavity size and shape in these complexes is highly dependent on the ligand conformation and can change to accommodate guest molecules. The reaction of [PdCl2(NCPh)(2)] with the ligands in a 1:2 ratio gave the mononuclear bis(chelate) derivative [Pd(LL)(2)](2+), with LL = 3, but the binuclear "lantern" or "paddlewheel" complexes [Pd-2(mu-LL)(4)(mu-Cl)](3+), with LL=1 or 2. The selective encapsulation of a chloride ion in these complexes is favored by multiple secondary bonding interactions of the types Cl center dot center dot center dot Pd and Cl center dot center dot center dot HC. (C) 2015 Elsevier Ltd. All rights reserved.