Structural Chemistry of Borazines

Abstract

Keywords: Borazines / Ring distortionThe solid-state structure of (HN=BF) 3 has been redetermined. It is characterised by a stacking of the molecules, similar to hexagonal boron nitride. In contrast, (F 3 CH 2 N=BF) 3 shows no intermolecular interactions between the planar borazine rings. In (Cl 2 BN=BCl) 3 , the Cl 2 B groups are almost perpendicularly oriented to the planar borazine ring and its B-Cl bonds are shorter than the Cl-B bonds to the ring boron atoms. Reactions of (Cl 2 BN=BCl) 3 with Me 3 SiNMe 2 allows a successive Cl/Me 2 N exchange. Depending on the molar ratio, the compounds [Cl

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

“…In the following step the proton in TTDS is replaced by a dichloroboryl group using butyl lithium (BuLi) and BCl 3 resulting in dichloroboryl-(trichlorosilyl)-(trimethylsilyl)-amine (DTTA). DTTA is converted by a [22], using m-xylene as solvent and reaction temperatures of 140 °C, our target molecule could not be obtained. Only at temperatures above 170 °C the latter borazine derivatives formed while the yield is dependent on the reaction temperature and time.…”

“…So, it was only possible to determine the average structure with a Cl : C ratio of nearly 1 : 2. Thus, the calculated B-Cl/C bond lengths of 1.678(4) and 1.689(2) Å are too long for pure B-C bonds like in 2,4,6-trimethylborazine (1.52 Å [33]), and too short for pure B-Cl bonds as found in 2,4,6-trichloroborazine (1.76 Å [34]) or in [(Si(CH 3 ) 3 )NBCl] 3 (1.79 Å [22]). The protons of the boron bonded methyl groups were localized in difference fourier maps during the structure solution, however, due to the mentioned mixed occupation, refinement of these positions was not possible.…”

Synthesis and Structure of per‐Methylated B6N7‐Azaboraphenalene

“…Contribution 270: Ref. [1] [ bis(trimethylstannyl)amine, [10] as shown in Equation (2). We now found a more efficient route to permethylated azaboraphenylene 2, as shown in Equation (3).…”

In silico studies toward the recognition of fluoride ion by substituted borazines

“…Synthesis of many substituted borazines with halogens, alkyl and phenyl groups as a substituents are reported [36,37]. Nöth and co-workers have discussed about the syntheses and structures of trihaloborazines [37]. It has been mentioned that the fluoro-derivative of 2,4,6-trihaloborazine is thermally more stable than its corresponding chloro-and bromo-derivatives [37].…”

“…In present article, we have examined the effect of substituents on borazine as receptor for their ability to bind the halide anions. Synthesis of many substituted borazines with halogens, alkyl and phenyl groups as a substituents are reported [36,37]. Nöth and co-workers have discussed about the syntheses and structures of trihaloborazines [37].…”