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Z. Naturforsch. 2013, 68b, 687 – 692
doi:10.5560/ZNB.2013-3053
Molecular and Crystal Structure of Chlorido[2-(N,N,N′,N′-tetramethylamidinio)ethynido]silver
Werner Weingärtner and Gerhard Maas
Institut für Organische Chemie I, Universität Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany
Reprint requests to Prof. Dr. Gerhard Maas. Fax: +49 731 5022803. E-mail: gerhard.maas@uni-ulm.de
Received February 16, 2013 / published online Juli 2, 2013
Dedicated to Professor Heinrich Nöth on the occasion of his 85th birthday
The solid-state structure of chlorido[2-(N,N,N′,N′-tetramethylamidinio)ethynido]silver (3), obtained by C(sp)-metalation of N,N,N′,N′-tetramethyl-propiolamidinium chloride with silver(I) oxide, has been determined by X-ray diffraction analysis. A comparison of bond lengths in the propiolamidinium moiety with those of the two genuine propiolamidinium salts 4 and 5, as well as with data for the isolated N,N,N′,N′-tetramethyl-propiolamidinium cation obtained by quantum-chemical calculations, has been made. It can be concluded that complex 3 is better described as a (tetramethylamidinio)ethynyl than as a 3,3-bis(dimethylamino)allenylidene silver complex.
Key words: Acetylenic Amidinium Salts, Alkynyl Silver Compound, 3,3-Diaminoallenylidene Silver Complex
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