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Synthesis of Metastable Si II X 2 Solutions ( X = F, Cl). A Novel Binary Halide for Synthesis
Author(s) -
Uhlemann Fabian,
Köppe Ralf,
Schnepf Andreas
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201400122
Subject(s) - metastability , chemistry , halide , boiling point , silicon , reactivity (psychology) , analytical chemistry (journal) , binary number , crystallography , inorganic chemistry , organic chemistry , medicine , alternative medicine , pathology , arithmetic , mathematics
Thermodynamic data for gaseous SiF 2 and SiCl 2 known from literature show that these binary subhalides are formed nearly quantitatively at 1376 °C and 1076 °C, respectively, as products of the reaction of elemental silicon with SiF 4 or SiCl 4 at 1 × 10 –2 mbar. Applying the co‐condensation technique SiF 2 as well as SiCl 2 can be trapped at –196 °C and prepared in synthetic scale. Herein, first analysis of metastable SiF 2 and SiCl 2 solutions are presented, showing that SiF 2 is more reactive than SiCl 2 leading to compounds of low boiling point of so far unknown composition. The metastable SiCl 2 solution can be used as a SiCl 2 source, which is shown by the trapping reaction with Idipp [Idipp = 1, 3‐bis(2, 6‐ i Pr 2 ‐C 6 H 3 )imidazol‐2‐ylidene] leading to Idipp‐SiCl 2 . The reactivity of the solution might be fine‐tuned by changing the donor opening the door for further applications.