Bi- and trinuclear coinage metal complexes of a PNNP ligand featuring metallophilic interactions and an unusual charge separation

A selective synthesis of bi- and trinuclear complexes featuring a tetradentate monoanionic PNNP ligand is presented. The binuclear coinage metal complexes show a typical fourfold coordination for Cu and Ag, which changes to a bifold coordination for Au. The latter is accompanied by an unusual charge...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2021-10, Vol.5 (38), p.13412-1342
Main Authors: Dahlen, Milena, Kehry, Max, Lebedkin, Sergei, Kappes, Manfred M, Klopper, Wim, Roesky, Peter W
Format: Article
Language:English
Subjects:
Coordination compounds
Copper
Ligands
Optical properties
Photoluminescence
Separation
Silver
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Summary:A selective synthesis of bi- and trinuclear complexes featuring a tetradentate monoanionic PNNP ligand is presented. The binuclear coinage metal complexes show a typical fourfold coordination for Cu and Ag, which changes to a bifold coordination for Au. The latter is accompanied by an unusual charge separation. Optical properties are investigated using photoluminescence spectroscopy and complemented by time-dependent density-functional-theory calculations. All compounds demonstrate clearly distinguished features dependent on the metals chosen and differences in the complex scaffold. Homometallic bi- and trinuclear complexes of Cu, Ag and Au ligated by a tetradentate PNNP ligand are shown. Photoluminescence and theoretical studies revealed a MLCT character upon UV excitation and complemented this work.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt02226a