A microwave investigation of the structure of trimethylamine-trimethylborane

Kuznesof, Paul M.; Kuczkowski, Robert L.

doi:10.1021/ic50186a059

Cited by 27 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For state 1 of (CH 3 ) 3 N-B(CH 3 ) 3 , the rotational constants are 7.6 MHz higher than the earlier values [17], or about twice the uncertainty in the previous study. Depending on the complex and the isotopologue, the rotational constants reported here are between one and four orders of magnitude more accurate than those given in the literature.…”

Section: Resultscontrasting

confidence: 65%

“…The J = 1 0 and 2 1 transitions of (CH 3 ) 3 N-BF 3 and the J = 1 0, 2 1 and 3 2 transitions [26] of (CH 3 ) 3 N-B(CH 3 ) 3 were readily located using the rotational constants reported previously [16][17][18]. The natural abundances of 10 B and 11 B are approximately 20% and 80%, respectively, and both boron isotopes were observed for both systems.…”

Section: Resultsmentioning

confidence: 99%

“…Using the estimated value of (eQq) 210 = À9.0 MHz [31] and the freemonomer value for (CH 3 ) 3 N of (eQq) amine = À5.5024(25) [32], gives values of 0.40 and 0.42 electrons transferred in the formation of the BF 3 and B(CH 3 ) 3 complexes, respectively. In performing these calculations, values of c were taken from the reported structures [16,17]. Note that, as previously discussed [33], this analysis ignores the overlap integral between the donor and acceptor orbital and thus, the ''electron transfer'' is properly interpreted as the number of electrons donated by the base but does not specify how the donated density is partitioned between the boron atom and the bonding region.…”

Section: Resultsmentioning

confidence: 99%

“…In order to fully characterize these dative interactions, however, it is of interest to vary the Lewis acid as well as the Lewis base. Many years ago, low resolution microwave spectra were reported at moderately high J for (CH 3 ) 3 N-BF 3 [16] and (CH 3 ) 3 N-B(CH 3 ) 3 [17,18] in static gas cells. While these studies determined bond lengths and bond angles in these complexes, the nuclear electric quadrupole hyperfine structure was not resolved.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Nuclear hyperfine structure in the donor–acceptor complexes (CH3)3N–BF3 and (CH3)3N–B(CH3)3

Hunt

Shelley

Leopold

2012

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

Section: Resultscontrasting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nuclear hyperfine structure in the donor–acceptor complexes (CH3)3N–BF3 and (CH3)3N–B(CH3)3

Hunt

Shelley

Leopold

2012

Journal of Molecular Spectroscopy

View full text Add to dashboard Cite

“…13 C-NMR -spektroskopische Charakterisierung dieser Verbindungen nicht mit ausreichender Aussagekraft möglich war. Aluminiums 1 -3 sowie die Donor-Akzeptor-Komplexe des Bors 4 -7 bilden tief orangefarbene Mikrokristalle, die sich erst bei Temperaturen > 100 °C thermisch zersetzen.…”

unclassified

Heterobimetallische Komplexe des Bors und Aluminiums mit dem 2-Dimethylaminomethyl)ferrocenyl-Liganden: Synthesen, Charakteristika und Kristallstrukturen

et al. 2000

View full text Add to dashboard Cite

In gleicher Weise wie monometallische Lithiumorganyle RLi (R = CH 3 , C 6 H 5 , C 6 H 5 CH 2 ) vermag auch das heterobimetallische [2-(Dimethylaminomethyl)ferrocenyl]-Lithium, (FcN)Li, gegenüber wasserfreien Metallhalogeniden bzw. -acetylacetonato-Komplexen bei diesbezüglichen Metathesereaktionen als Organylgruppenüberträger zu fungieren und damit den Zugriff auf 2-(Dimethylaminomethyl)ferrocenyl-Derivate ausgewählter Haupt-und Nebengruppenelemente zu ermöglichen. Der Raumbedarf (Abschirmeffekt) sowie die potentielle Fähigkeit der FcN-Gruppe zur Chelatbildung, wobei freie Koordinationsstellen des jeweiligen Zentralatoms unter Ausbildung von M←N-Wechselwirkungen besetzt werden können, sind für eine kinetische Stabilisierung solcher Heterobimetallorganika von Vorteil. Auf Grund der relativ hohen Bindungspolarität der Li-C-σ-Bindung wirkt aber das (FcN)Li auch gleichzeitig reduzierend auf Übergangsmetallatome höherer Oxidationsstufen (z.Abstract. The organometal derivatives (FcN)BCl 2 (1), (FcN) 2 AlX [X = Br (2), I (3)] are formed at metathesis reactions of the anhydrous metal halides MX 3 (M = B, X = Cl; M = Al, X = Br, I) with 2-(dimethylaminomethyl)ferrocenyl lithium, (FcN)Li. In contrary donor-acceptor complexes of the formula L→BX' 3 [X' = C 6 H 5 CH 2 (4), Cl (5), Br (6), I (7)]Im Gegensatz zu den Lithiumorganylen lassen monometallische Triorganoderivate des Bors und Aluminiums infolge ihrer -im Vergleich zu RLi -geringeren Bindungspolarität [2], gegenüber Übergangsmetallhalogeniden und -acetylacetonatokomplexen mit Übergangsmetallatomen höherer Oxidationsstufen, eine weniger starke Reduktionstendenz erkennen. So reagieren z.B. WCl 6 und (n-Bu) 3 B zu n-BuWCl 5 [3], bzw. VCl 4 mit (Allyl) 3 B zu (Allyl)VCl 3 [4]. Ausgehend von Co(acac) 3 und (C 6 H 5 CH 2 ) 3 Al oder R 2 Al(OEt) (R = CH 3 , C 2 H 5 ) sind in Gegenwart von Phosphanen PR' 3 z.B. die Organoderivate des dreiwertigen Cobalts (C 6 H 5 CH 2 ) Co(acac) 2 ·PR' 3 [5] bzw. R 2 Co(acac)·(PR' 3 ) 2 [6, 7] erhältlich.Während bisher vergleichbare homoleptische 2-(Dimethylaminomethyl)ferrocenyl-Verbindungen (FcN) 3 M (M = B, Al) unbekannt sind und lediglich das heteroleptische Organoborderivat (FcN)B(OH) 2 beschrieben wurde [8], konnten in jüngster Zeit als Vertreter von Heterobimetallorganika der schwereren Elemente der are formed at metalation reactions of dimethylaminomethylferrocene (L, FcNH) and BX' 3 .The crystal structures of 1 -3 and 5 could be proved by single crystal x-ray determinations. An intervalent electron transfer was determined by 57 Fe-Mössbauer spectroscopy at 1 -7. Cyclic voltammetric measurement was carried out at complex 4. 666

show abstract

Boron–Nitrogen Compounds, Organic

Manning¹,

Griffin²

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

There are four classes of B–N compounds. Amine boranes, R 3 B–NR′ 3 , have the nitrogen atom which supplies both electrons in the B–N bond; these are isoelectronic with alkanes, R 3 C–CR′ 3 . Aminoboranes, , have a covalent bond between B and N. These are isoelectronic with alkenes, . Iminoboranes, , have a two‐coordinate boron interacting with the nitrogen via a triple bond; these are isoelectronic with alkynes, . Borazines, , are cyclic compounds containing alternating tricoordinate boron and nitrogen atoms. Borazines are isoelectronic with benzene, C 6 H 6 . Amine–borane adducts have the general formula where , alkyl, etc, and , H, halogen, etc. These compounds, characterized by a coordinate covalent bond between boron and nitrogen, form a class of reducing agents having a broad spectrum of reduction potentials. Amine boranes are usually colorless, crystalline compounds which exhibit sharp melting points and thermal stability when pure. The aminoboranes are characterized by a normal covalent bond between boron and nitrogen in which an electron from each atom is shared. There exists a wide variety of aminoborane compounds; among those that have been thoroughly investigated are the monoaminoboranes X 2 BNR 2 , bisaminoboranes XB(NR 2 ) 2 , and trisaminoboranes B(NR 2 ) 3 . The substituents X and R may vary widely, but generally R is an alkyl or aryl group, or hydrogen, whereas X can represent a rather wide variety of atoms or groups. One of the more common routes for the synthesis of aminoboranes involves the aminolysis of the appropriate boron halide. Monoaminoboranes readily undergo association. The monomers are generally liquids or low melting solids, whereas the dimers and trimers are crystalline solids. Aminoboranes have been used as ligands in complexes with transition metals. The reduction of (alkylamino)haloboranes using hydride reagents can provide a convenient route to (alkylamino)boranes. Iminoboranes, SBNR, are isoelectronic with alkynes, XCCR. The polarity of the B–N bond makes iminoboranes much more reactive than the analogous SCCR species. Polar compounds add to iminoboranes, provided the addition proceeds more rapidly than oligomerization of . In an analogous fashion to the hydroboration reaction, a variety of boron‐containing substrates react with iminoboranes. The largest and most extensively studied family of boron–nitrogen compounds is that of the borazines, characterized by a six‐membered ring system containing alternating boron and nitrogen atoms. Because borazine is isoelectronic and isostructural with benzene, it has been called inorganic benzene. Borazines are liquids or crystalline solids depending on the substitution pattern. Most are sensitive to moisture and must be handled in an inert atmosphere. Borazines undergo addition reactions rather than electrophilic substitution reactions typical of benzene compounds. Borazine is slowly hydrolyzed by water at ambient or higher temperatures to boric acid. Miscellaneous reactions of borazines include photolysis and complex formation. Organic boron–nitrogen compounds have not found extensive usage, and therefore very few are manufactured on a large scale. Borazines, particularly polymeric compounds, have been extensively investigated as preceramic materials from which coatings and fibers of boron nitride can be produced upon thermolysis. B ‐Aryl and halogeno–amino borazines are reported to have seen use as fire retardants in cotton and nylon textiles. Other reported uses for borazines are as epoxy resin catalysts, polymerization inhibitors of unsaturated alcohols and esters, and catalysts for polymerization of alkenes.

show abstract

A microwave investigation of the structure of trimethylamine-trimethylborane

Cited by 27 publications

References 0 publications

Nuclear hyperfine structure in the donor–acceptor complexes (CH3)3N–BF3 and (CH3)3N–B(CH3)3

Nuclear hyperfine structure in the donor–acceptor complexes (CH3)3N–BF3 and (CH3)3N–B(CH3)3

Heterobimetallische Komplexe des Bors und Aluminiums mit dem 2-Dimethylaminomethyl)ferrocenyl-Liganden: Synthesen, Charakteristika und Kristallstrukturen

Boron–Nitrogen Compounds, Organic

Contact Info

Product

Resources

About