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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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A new aspect of the “pseudo water” concept of bis(trimethylsilyl)carbodiimide – “pseudohydrates” of aluminum

Katrin Krupinski
  • TU Bergakademie Freiberg, Department of Chemistry and Physics, Institute of Inorganic Chemistry, Leipziger Str. 29, 09599 Freiberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Erica Brendler
  • TU Bergakademie Freiberg, Department of Chemistry and Physics, Institute of Analytical Chemistry, Leipziger Str. 29, 09599 Freiberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Robert Gericke
  • TU Bergakademie Freiberg, Department of Chemistry and Physics, Institute of Inorganic Chemistry, Leipziger Str. 29, 09599 Freiberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jörg Wagler
  • TU Bergakademie Freiberg, Department of Chemistry and Physics, Institute of Inorganic Chemistry, Leipziger Str. 29, 09599 Freiberg, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Edwin KrokeORCID iD: http://orcid.org/0000-0002-7934-6439
Published Online: 2018-09-29 | DOI: https://doi.org/10.1515/znb-2018-0137

Abstract

Bis(trimethylsilyl)carbodiimide (BTSC), so-called “pseudo water” because of some analogies such as similar (group)electronegativities of Me3Si– vs. H– and –N=C=N– vs. –O–, may form two different kinds of “pseudo hydrates” of metals (M), i.e. M–N(SiMe3)=C=N(SiMe3) and M–N≡C–N(SiMe3)2, derived from its carbodiimide and cyanamide isomeric forms, respectively. With anhydrous AlCl3 in Me3SiCl solution BTSC was shown to be capable of forming both kinds of solvates, i.e. Cl3Al–N(SiMe3)–C≡N(SiMe3) (1) and ((Cl3Al)(Me3Si)NCN)3–Al–(N≡C–N(SiMe3)2)3 (2). Both compounds were isolated as crystalline solids, which undergo condensation reactions upon storage. By single-crystal X-ray diffraction analysis the constitution of 1 was confirmed unambiguously, and quantum chemical calculations (B3LYP/6-311++g(d,p)) confirmed that compound 1 is 6 kcal mol−1 more stable than its hypothetical N,N-bis(trimethylsilyl)cyanamide isomer Cl3Al–N≡C–N(SiMe3)2. Compound 1 represents the first crystallographically confirmed disilylcarbodiimide complex of a metal salt. The molecules of compound 2 are heavily disordered in the solid state (positional disorder of N≡C–N(SiMe3)2 vs. N≡C–N(SiMe3)(AlCl3) and positional disorder of SiMe3 vs. AlCl3 groups in the latter). Therefore, the identity of 2 was additionally confirmed by 13C, 15N, 27Al and 29Si CP/MAS NMR spectroscopy.

This article offers supplementary material which is provided at the end of the article.

Keywords: aluminum chloride coordination; carbodiimide; cyanamide; isomerism; solid-state NMR; X-ray diffraction

Dedicated to: Professor Werner Uhl on the occasion of his 65th birthday.

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About the article

Received: 2018-06-30

Accepted: 2018-09-01

Published Online: 2018-09-29


Citation Information: Zeitschrift für Naturforschung B, 20180137, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2018-0137.

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