Fine tuning of pentachromium(ii) metal string complexes through elaborate design of ligand
Journal
New Journal of Chemistry
Journal Volume
36
Journal Issue
3
Pages
632-637
Date Issued
2012
Author(s)
Abstract
New pentachromoium metal string complexes [Cr5(μ5- L)4X2] (X = Cl-, L = dppzda2- (1), dpzpda2- (2); X = NCS-, L = dppzda2- (3), dpzpda2- (4)) were designed and synthesized through pyrazine-modulation of tripyridyldiamine ligand. X-Ray crystallographic studies revealed a linear metal chain structure consisting of two quadruple Cr-Cr bonds and a separated high spin Cr(ii) at an end in crystallized form. A quintet ground state was observed for all pentachromium(ii) molecules by magnetic study with g values of 2.04-2.18. While the electronic structure remained unchanged after the modification of ligands, electrochemistry showed a significant change in the molecular orbital energy levels of metal string molecules. Observation of the first oxidation peak of 1 at +0.57 V and of 2 at +0.73 V revealed that these complexes are quite resistant to oxidation. Single molecular conductance measurements showed that the complex exhibited good electronic conductance. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2012.
SDGs
Type
journal article