1109. Boron hydride derivatives. Part IX. The reaction of decaborane with ammonia

Williams, John M.; Williams, R. L.; Wright, J. C.

doi:10.1039/jr9630005816

Cited by 8 publications

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“…The four absorption bands are seen in the spectrum of the film deposited at 300~ These correspond to NH stretching (3200 cm-') (19,20), BH stretching (2500 cm-') (20), and antisymmetric and symmetric NH3 deformation mode (1550 cm -1, 1405 cm-') (19). Above 500~ the absorption due to the BN lattice vibration appears at 1380 and 800 cm-' (21), and that due to the BH and NH stretching vibration disappears. Figure 5 shows the infrared transmission and reflection spectra of the film deposited at 1000~…”

Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Amorphous Boron Nitride Films by Molecular Flow Chemical Vapor Deposition

Nakamura

1985

J. Electrochem. Soc.

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A new chemical vapor deposition method of thin film in molecular flow region (MF‐CVD) is proposed, and is applied to the preparation of boron nitride films using ammonia and decaborane reaction gases. It is found that the composition of the films can be closely controlled by regulating the pressure of source gases and stoichiometric boron nitride films deposited at NH3/B10H14≧20 at the substrate temperature of 850°C. From the chemical shift of boron Kα2 peak in the x‐ray fluorescence spectra, the BNx films having the composition x<0.75 are mixture of boron and boron nitride. X‐ray diffraction study indicates that the films are amorphous. The optical properties of the boron nitride films are also clarified. The energy of the direct allowed transition is estimated to be 5.90 eV.

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Section: Resultsmentioning

confidence: 99%

Preparation and Properties of Amorphous Boron Nitride Films by Molecular Flow Chemical Vapor Deposition

Nakamura

1985

J. Electrochem. Soc.

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“…The precipitate was filtered off, washed with water, and recrystallized from water. Compounds 2 − 4 were synthesized according to the literature. − …”

Section: Methodsmentioning

confidence: 99%

Real-Space Indicators for Chemical Bonding. Experimental and Theoretical Electron Density Studies of Four Deltahedral Boranes

et al. 2010

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In an approach combining high-resolution X-ray diffraction at low temperatures with density functional theory calculations, two closo-borates, B(12)H(12)(2-) (1) and B(10)H(10)(2-) (2), and two arachno-boranes, B(10)H(12)L(2) [L = amine (3) or acetonitrile (4)], were analyzed by means of the atoms-in-molecules (AIM) theory and electron localizability indicator (ELI-D). The two-electron three-center (2e3c) bonds of the borane cages are investigated with the focus on real-space indicators for chemical bonding and electron delocalization. In compound 2, only two of the three expected bond critical points (bcp's) are found. However, a weakly populated ELI-D basin is found for this pair of adjacent B atoms and the delocalization index and the Source contributions are on the same order of magnitude as those for the other pairs. The opposite situation is found in the arachno-boranes, where no ELI-D basins are found for two types of B-B pairs, which, in turn, exhibit a bcp. However, again the delocalization index is on the same order of magnitude for this bonding interaction. The results show that an unambiguous real-space criterion for chemical bonding is not given yet for this class of compounds. The arachno-boranes carry a special B-B bond, which is the edge of the crown-shaped molecule. This bond is very long and extremely curved inward the B-B-B ring. Nevertheless, the corresponding bond ellipticity is quite small and the ELI-D value at the attractor position of the disynaptic valence basin is remarkably larger than those for all other B-B valence basins. Furthermore, the value of the ED is large in relation to the B-B bond length, so that only this bond type does not follow a linear relationship of the ED value at the bcp versus B-B bond distances, which is found for all other B-B bcp's. The results indicate that both 2e2c and 2e3c bonding play a distinct role in borane chemistry.

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“…The reactions of the 6,9-bis(acetonitrilium) derivative with tertiary amines in refluxing benzene or toluene lead to the corresponding 6,9-bis(trialkylammonium) derivatives [arachno-6,9-(R 3 N) 2 -B 10 H 12 ] (R = Me, Et) [214,245]. The 6,9-bis(ammonium) derivative [arachno-6,9-(H 3 N) 2 -B 10 H 12 ] was prepared by the reaction of decaborane( 14) with ammonia in benzene or toluene [259,260]. The solid state structures of [6,9-(H 3 N) 2 -B 10 H 12 ] (Figure 16) [243,261] were studied by X-ray photoelectron and X-ray fluorescence spectroscopy [225,226,264].…”

Section: Derivatives With a B-n Bondmentioning

confidence: 99%

“…The reaction of the 6,9-bis(acetonitrilium) derivative with methanol results in the formation of the corresponding imidate [arachno-6,9-(MeO(Me)C=HN)2-B10H12] [248].Nowadays, the addition of nucleophiles to the activated triple -С≡N-bond of nitrilium derivatives of various polyhedral boron hydrides has become a widely used method for their modification[249][250][251][252][253][254][255][256][257][258].The reactions of the 6,9-bis(acetonitrilium) derivative with tertiary amines in refluxing benzene or toluene lead to the corresponding 6,9-bis(trialkylammonium) derivatives [arachno-6,9-(R3N)2-B10H12] (R = Me, Et)[214,245]. The 6,9-bis(ammonium) derivative [arachno-6,9-(H3N)2-B10H12] was prepared by the reaction of decaborane(14) with ammonia in benzene or toluene[259,260]. The solid state structures of [6,9-(H3N)2-…”

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confidence: 99%

Decaborane: From Alfred Stock and Rocket Fuel Projects to Nowadays

Sivaev

2023

Molecules

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The review covers more than a century of decaborane chemistry from the first synthesis by Alfred Stock to the present day. The main attention is paid to the reactions of the substitution of hydrogen atoms by various atoms and groups with the formation of exo-polyhedral boron–halogen, boron–oxygen, boron–sulfur, boron–nitrogen, boron–phosphorus, and boron–carbon bonds. Particular attention is paid to the chemistry of conjucto-borane anti-[B18H22], whose structure is formed by two decaborane moieties with a common edge, the chemistry of which has been intensively developed in the last decade.

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1109. Boron hydride derivatives. Part IX. The reaction of decaborane with ammonia

Cited by 8 publications

References 0 publications

Preparation and Properties of Amorphous Boron Nitride Films by Molecular Flow Chemical Vapor Deposition

Preparation and Properties of Amorphous Boron Nitride Films by Molecular Flow Chemical Vapor Deposition

Real-Space Indicators for Chemical Bonding. Experimental and Theoretical Electron Density Studies of Four Deltahedral Boranes

Decaborane: From Alfred Stock and Rocket Fuel Projects to Nowadays

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