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Krupinski K, Brendler E, Gericke R, Wagler J, Kroke E. A new aspect of the “pseudo water” concept of bis(trimethylsilyl)carbodiimide – “pseudohydrates” of aluminum. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2018. [DOI: 10.1515/znb-2018-0137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
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.
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Affiliation(s)
- Katrin Krupinski
- TU Bergakademie Freiberg, Department of Chemistry and Physics , Institute of Inorganic Chemistry , Leipziger Str. 29 , 09599 Freiberg , Germany
| | - Erica Brendler
- TU Bergakademie Freiberg, Department of Chemistry and Physics , Institute of Analytical Chemistry , Leipziger Str. 29 , 09599 Freiberg , Germany
| | - Robert Gericke
- TU Bergakademie Freiberg, Department of Chemistry and Physics , Institute of Inorganic Chemistry , Leipziger Str. 29 , 09599 Freiberg , Germany
| | - Jörg Wagler
- TU Bergakademie Freiberg, Department of Chemistry and Physics , Institute of Inorganic Chemistry , Leipziger Str. 29 , 09599 Freiberg , Germany
| | - Edwin Kroke
- TU Bergakademie Freiberg, Department of Chemistry and Physics , Institute of Inorganic Chemistry , Leipziger Str. 29 , 09599 Freiberg , Germany
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Peloquin DM, Schmedake TA. Recent advances in hexacoordinate silicon with pyridine-containing ligands: Chemistry and emerging applications. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.02.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Müller C, Kraushaar K, Doebbe A, Mussgnug JH, Kruse O, Kroke E, Patel AV. Synthesis of transparent aminosilane-derived silica based networks for entrapment of sensitive materials. Chem Commun (Camb) 2013; 49:10163-5. [PMID: 24051654 DOI: 10.1039/c3cc45023f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel sol-gel synthesis route is reported which results in the formation of optically transparent silica based hydro- and xerogels from an aminosilane precursor in aqueous solutions. These materials can be used for entrapment of microalgae and light-harvesting complex (LHC) samples.
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Affiliation(s)
- Christiane Müller
- University of Applied Sciences Bielefeld, Faculty of Engineering Science and Mathematics, Wilhelm-Bertelsmann-Str. 10, 33602 Bielefeld, Germany.
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Cheng H, Li Y, Kroke E, Herkenhoff S. In situ synthesis of Si2N2O/Si3N4 composite ceramics using polysilyloxycarbodiimide precursors. Ann Ital Chir 2013. [DOI: 10.1016/j.jeurceramsoc.2013.02.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Schmidt CL, Jansen M. Catalytic transformation of silicon tetraisocyanate Si(NCO)4to a polymeric silylcarbodiimide. Appl Organomet Chem 2013. [DOI: 10.1002/aoc.2940] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Martin Jansen
- Max-Planck-Institut für Festkörperforschung; 70569; Stuttgart; Germany
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Schwarz D, Brendler E, Kroke E, Wagler J. Pentacoordinate Silicon Complexes withN-(2-pyridylmethyl)salicylamide as a Dianionic (ONN′) Tridentate Chelator. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200084] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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