Infrared matrix isolation study of the reaction of diborane with the methylamines

Generation of aminoborane monomers RR′NBH2from amine–boronium cations [RR′NH–BH2L]+: metal catalyst-free formation of polyaminoboranes at ambient temperature

“…Based on the analogous chemistry for 1, 3 and 5 a plausible intermediate in the conversion of 2 to 8 is methylaminoborane, MeNHQBH 2 , 9. This species, the B-N analog of propylene, is highly reactive and has only previously been detected by IR spectroscopy in inert gas matrices at 14 K. 15 Trapping of this species is possible with cyclohexene, as shown in previous thermal and catalytic redistribution reactions of linear diborazanes. 10c To test for the presence of 9 as an intermediate, 2.5 equiv.…”

Identification of diborane(4) with bridging B–H–B bonds

“…[16][17][18][19][20] Investigations of transient boron species using the matrixisolation technique have been reported. [21][22][23][24][25] For instance, reactions of H 2 with boron atoms evaporated with a pulsed laser and condensed in excess argon at 10 K yielded products such as BH, (H 2 )(BH) complex, BH 3 , (H 2 )(BH 3 ) complex, HBBH and B 2 H 6 , identied from infrared absorption spectra. 23 The irradiation of samples of B 2 H 6 diluted in neon or argon at 4 K with light at 16.8 eV followed by X-rays and electrons at 50 eV enabled the detection of BH 2 , BO, B 2 and HBBH through electron-paramagnetic-resonance spectra, 24 but no neutral boron hydride species with less than six H atoms and a bridging B-H-B bond has been experimentally identied before our work.…”

Transmission Infrared Spectroscopy of Ammonia Borane

“…In both cases 3,4 , amino borane (BH 2 NH 2 ) and borazine (B 3 N 3 H 6 ) were observed as gas phase products with mass spectrometry. Miranda There have been previous relevant IR studies of ammonia borane 6,7 and of amino borane in the gas 8 and solid 9 phases, or trapped in inert matrices [10][11][12] . The loss of hydrogen to form amino borane-like structures with a B=N double bond should be apparent in the IR spectra.…”