Issue 24, 2012

Looking for the origin of the switch between coordination-captured helicates and catenates

Abstract

Self-assembly of the linear segmental ligand L5, consisting of a tridentate binding unit flanked with two bidentate binding units, with a mixture of FeII/AgI yields the trinuclear coordination-captured [2]catenate [AgFeAg(L5)2]4+ instead of the planned isomeric double-stranded helicate. Replacing the octahedral (FeII) and tetrahedral (AgI) cations with ZnII, which is compatible with both geometries, gives intricate mixtures of homometallic complexes upon reaction with the twin ligand L6, from which the macrocyclic dinuclear complex [Zn2(L6)]4+ can be isolated. Application of the thermodynamic site binding model attributes the origin of the ligand preference for producing single-stranded macrocycles, the precursors of the trinuclear catenate, to the abnormally low value of the effective molarity controlling the intramolecular connection leading to the usual double-stranded helical isomer.

Graphical abstract: Looking for the origin of the switch between coordination-captured helicates and catenates

Supplementary files

Article information

Article type
Paper
Submitted
21 Feb 2012
Accepted
16 Apr 2012
First published
11 May 2012

Dalton Trans., 2012,41, 7218-7226

Looking for the origin of the switch between coordination-captured helicates and catenates

L. Aboshyan-Sorgho, M. Cantuel, G. Bernardinelli and C. Piguet, Dalton Trans., 2012, 41, 7218 DOI: 10.1039/C2DT30414G

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