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Linear and Cyclic Platinum σ‐Acetylide Complexes of Tetraethynylethene
Author(s) -
Faust Rüdiger,
Diederich François,
Gramlich Volker,
Seiler Paul
Publication year - 1995
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19950010204
Subject(s) - acetylide , platinum , metallacycle , chemistry , crystallography , tetracoordinate , stereochemistry , ligand (biochemistry) , moiety , metal , x ray crystallography , diffraction , organic chemistry , biochemistry , physics , computer graphics (images) , receptor , computer science , optics , planar , catalysis
The syntheses of the first organometallic mono‐ and dinuclear platinum complexes bearing the tetraethynylethene unit as an η 1 ‐ligand are reported. Structural characterization of two of the trans σ‐bis(acetylide) derivatives by X‐ray crystallography reveals coplanarity of the acetylenic π‐ligands and indicates possible electronic delocalization across the metal center. This notion is further supported by comparing the electronic absorption spectra of the platinum‐containing compounds with those of related tetraethynylethene derivatives without metals. The solidstate structure of a dinuclear complex with two iodoplatinum fragments attached to one set of geminal acetylenes of tetraethynylethene was also investigated by X‐ray diffraction. Hay coupling of a mononuclear species leads to the incorporation of the σ‐bis(acetylide) moiety into a diplatinated metallacycle. This macrocyclic compound represents a novel structural motif in the design of a transition metal linked carbon network based on tetraethynylethene.