Infrared and raman spectra, conformational stability and normal coordinate analysis of ethyldimethylamine-borane

Durig, J. R.; Lindsay, N. E.; Hizer, T. J.; Odom, J. D.

doi:10.1016/s0022-2860(98)80126-9

“…The formation of 3 a – c was confirmed by 11 B NMR spectroscopy as demonstrated by a shift in the resonance from 1 (δ B =−3.6 ppm) to higher field upon reaction to form 3 a – c (δ B =−7.4 to −13.5 ppm). Infrared spectroscopy of 3 a – c reveal B‐H stretches of ν BH =2345–2411 cm −1 which lie between reported stretching frequencies for sp 2 (B−H), ν BH =2467–2564 cm −1 , [63, 64] and sp 3 (B−H), ν BH =2273–2383 cm −1 [65] . The analogous Zn complex, [Zn{BH 2 (cAAC)} 2 ] ( 4 , Scheme 1) can also be prepared by a salt‐metathesis route and shows B−H stretches (ν BH =2373, 2420 cm −1 ) that are marginally higher frequency than 3 a – c .…”

Section: Resultssupporting

confidence: 71%

Group 11 Borataalkene Complexes: Models for Alkene Activation

Phillips

¹

,

Kong

²

,

White

³

et al. 2021

View full text Add to dashboard Cite

A series of linear late transition metal (M=Cu, Ag, Au and Zn) complexes featuring a side‐on [B=C]− containing ligand have been isolated and characterised. The [B=C]− moiety is isoelectronic with the C=C system of an alkene. Comparison across the series shows that in the solid‐state, deviation between the η2 and η1 coordination mode occurs. A related zinc complex containing two [B=C]− ligands was prepared as a further point of comparison for the η1 coordination mode. The bonding in these new complexes has been interrogated by computational techniques (QTAIM, NBO, ETS‐NOCV) and rationalised in terms of the Dewar–Chatt–Duncanson model. The combined structural and computational data provide unique insight into catalytically relevant linear d10 complexes of Cu, Ag and Au. Slippage is proposed to play a key role in catalytic reactions of alkenes through disruption and polarisation of the π‐system. Through the preparation and analysis of a consistent series of group 11 complexes, we show that variation of the metal can impact the coordination mode and hence substrate activation.

show abstract

“…The spectra show NÀ H (3400-3100 cm À 1 ) and CÀ H (3000-2750 cm À 1 ) stretching bands due to NH 2 and C x H 2x + 1 . [53,54] They also show BÀ H (2500-2100 cm À 1 ) stretching bands due to the BH 3 groups. [55] The spectra were compared to those of the CxA.…”

Section: Ftir Analyses Of the Cxabmentioning

confidence: 97%

“…Nevertheless, the CÀ N stretching vibrations are observed between 1100 and 1000 cm À 1 . [53,54] The spectra of the CxAB show an additional band at a wavenumber lower than 700 cm À 1 , which is due to the BÀ N bond. All of these observations are consistent with the formation of the CxAB.…”

Section: Ftir Analyses Of the Cxabmentioning

confidence: 99%

A Series of Primary Alkylamine Borane Adducts C_xH_2x+1NH₂BH₃: Synthesis and Properties

Turani‐I‐Belloto

¹

,

Valero-Pedraza

²

,

Chiriac

³

et al. 2021

View full text Add to dashboard Cite

Primary alkylamine borane adducts C x H 2x + 1 NH 2 BH 3 (CxAB) are unconventional molecules that may offer great opportunities in chemistry owing to their dihydrogen H δ + ⋅⋅⋅H δÀ bonds. Herein, we focus on six CxAB (x = 4,6,8,10,12,14), synthesized by Lewis acid-base reaction between the complex (CH 3 ) 2 S⋅BH 3 and the primary alkylamines. At ambient temperature, C4AB and C6AB are oily liquid, and the other adducts are crystalline solids. The melting temperatures of the CxAB linearly increase as a function of ln(x) due to stronger intermolecular Van der Waals forces between the alkyl chains, and they are higher by 20-40°C than those of the amines due to dihydrogen H δ + ⋅⋅⋅H δÀ bonds between the NH 2 BH 3 heads. The occurrence of dihydrogen H δ + ⋅⋅⋅H δÀ bonds is further confirmed by molecular and structural analyses. This is discussed hereafter.

show abstract

“…Infrared spectroscopy of 3a-c reveal B-H stretches of n BH = 2345-2411 cm À1 which lie between reported stretching frequencies for sp 2 (BÀH), n BH = 2467-2564 cm À1 , [63,64] and sp 3 (BÀH), n BH = 2273-2383 cm À1 . [65] The analogous Zn complex, [Zn{BH 2 (cAAC)} 2 ](4,Scheme 1) can also be prepared by as alt-metathesis route and shows B À H stretches (n BH = 2373, 2420 cm À1 )t hat are marginally higher frequency than 3a-c.…”

Section: Synthesismentioning

confidence: 99%

Group 11 Borataalkene Complexes: Models for Alkene Activation

Phillips

¹

,

Kong

²

,

White

³

et al. 2021

View full text Add to dashboard Cite

A series of linear late transition metal (M=Cu, Ag, Au and Zn) complexes featuring a side‐on [B=C]− containing ligand have been isolated and characterised. The [B=C]− moiety is isoelectronic with the C=C system of an alkene. Comparison across the series shows that in the solid‐state, deviation between the η2 and η1 coordination mode occurs. A related zinc complex containing two [B=C]− ligands was prepared as a further point of comparison for the η1 coordination mode. The bonding in these new complexes has been interrogated by computational techniques (QTAIM, NBO, ETS‐NOCV) and rationalised in terms of the Dewar–Chatt–Duncanson model. The combined structural and computational data provide unique insight into catalytically relevant linear d10 complexes of Cu, Ag and Au. Slippage is proposed to play a key role in catalytic reactions of alkenes through disruption and polarisation of the π‐system. Through the preparation and analysis of a consistent series of group 11 complexes, we show that variation of the metal can impact the coordination mode and hence substrate activation.

show abstract

Infrared and raman spectra, conformational stability and normal coordinate analysis of ethyldimethylamine-borane

Cited by 10 publications

References 14 publications

Group 11 Borataalkene Complexes: Models for Alkene Activation

Group 11 Borataalkene Complexes: Models for Alkene Activation

A Series of Primary Alkylamine Borane Adducts C_xH_2x+1NH₂BH₃: Synthesis and Properties

Group 11 Borataalkene Complexes: Models for Alkene Activation

Contact Info

Product

Resources

About

Infrared and raman spectra, conformational stability and normal coordinate analysis of ethyldimethylamine-borane

Cited by 10 publications

References 14 publications

Group 11 Borataalkene Complexes: Models for Alkene Activation

Group 11 Borataalkene Complexes: Models for Alkene Activation

A Series of Primary Alkylamine Borane Adducts CxH2x+1NH2BH3: Synthesis and Properties

Group 11 Borataalkene Complexes: Models for Alkene Activation

Contact Info

Product

Resources

About

A Series of Primary Alkylamine Borane Adducts C_xH_2x+1NH₂BH₃: Synthesis and Properties