Synthesis, Crystal Structure, and Spectroscopic Characterization of the Borazine Derivatives [B{CH₂(SiCl₃)}NH]₃ and [B{CH₂(SiCl₂CH₃)}NH]₃

Abstract

The borazine derivatives B,BЈ,BЉ-tris[(trichlorosilyl)methyl]borazine [B{CH 2 (SiCl 3 )}NH] 3 (1), and B,BЈ,BЉ-tris[{dichloro(methyl)silyl}methyl]borazine [B{CH 2 (SiCl 2 CH 3 )}NH] 3 (2) were prepared by reacting (Cl 3 Si)CH 2 (BCl 2 ) (3) and [Cl 2 (CH 3 )Si]CH 2 (BCl 2 ) (4) with hexamethyldisilazane (hmds), respectively. Both compounds, 1 and 2 crystallize in space group R3c with a ϭ 1712.53(4), c ϭ 1230.33(4) pm, Z ϭ 6, R 1 ϭ 0.030, and a ϭ 1713.8(2), c ϭ 1258.7(2) pm, Z ϭ 6, R 1 ϭ 0.034, respectively. According to the single crystal X-ray diffraction analyses, Synthese, Kristallstruktur und spektroskopische Charakterisierung der Borazinderivate [B{CH 2 (SiCl 3 )}NH] 3 und [B{CH 2 (SiCl 2 CH 3 )}NH] 3 Inhaltsübersicht. Die Borazinderivate B,BЈ,BЉ-Tris[(trichlorsilyl)methyl]borazin [B{CH 2 (SiCl 3 )}NH] 3 (1) und B,BЈ,BЉ-Tris[{dichlor-(methyl)silyl}methyl]borazin [B{CH 2 (SiCl 2 CH 3 )}NH] 3 (2) wurden durch Reaktion von (Cl 3 Si)CH 2 (BCl 2 ) (3) bzw. [Cl 2 (CH 3 )Si]-CH 2 (BCl 2 ) (4) mit Hexamethylsilazan (HMDS) erhalten. 1 und 2 kristallisieren in der Raumgruppe R3c mit a ϭ 1712,53(4), c ϭ 1230,33(4) pm, Z ϭ 6, R 1 ϭ 0,030 bzw. a ϭ 1713,8(2), c ϭ

Borazine Based Molecular Single Source Precursors for Si/B/N/C Ceramics

“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 The constitution of the obtained borazines as determined spectroscopically has been confirmed by single crystal structure analysis (Table 1, Figure 3). As a striking feature, though not unique, the B 3 N 3 -core of the molecule is not planar but in a chair conformation ( Figure 3 [31] and {(SiCl 3 )C 2 H 3 ]BNH} 3 [32]) are planar. (Table 2), the coincidences of the B-Cl and B-CH 3 groups of the individual molecules necessitate the splitting of the 4c site for Cll/C1 and of the 8d site for Cl2/C2 leading to site occupation factors 0.180(3) for Cl1, 0.319(3) for C1, 0.370(4) for Cl2 and 0.629(4) for C2.…”

Improved durability of Si/B/N/C random inorganic networks

“…13 By reacting these two molecules with hexamethyldisilazane, the new precursors [B{CH 2 (SiCl 3 )}NH] 3 (TSMB) and [B{CH 2 (SiCl 2 CH 3 )}NH] 3 (DSMB) were obtained, respectively. 14 …”

N‐(2,4,6‐Trimethylborazinyl)‐Substituted Phosphanes, Arsanes, and Stibanes

“…The remaining B-N bonds are shorter than those observed for borazines of the type (RB=NH) 3 (1.42-1.44 Å). [17] The B-N-B angles at atoms N1 and N4 [119.8(6)°and 118.6(6)°, respectively] are more acute than all other B-N-B bond angles [125.5(6)-126.7(6)°] while all N-B-N bond angles are smaller than 120°(by an average of 4°).…”

“…The P-P bond in 18 [2.287(1) Å] is longer than in 17 Figure 10. Molecular structure of P,P-dimesityl-PЈ,PЈ-bis(trimethylborazinyl)diphosphane (17). Hydrogen atoms, with the exception of the NH hydrogens, have been omitted.…”