Microwave spectra, structures, and dipole moments of trimethylphosphine-borane and methylphosphine-borane

Bryan, Philip S.; Kuczkowski, Robert L.

doi:10.1021/ic50109a026

Cited by 107 publications

(39 citation statements)

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“…The average B--P--X angle is 113.6(8) ° while the average H--P---C angle is 102.9 (20) °. The P--B bond distance of 1.919 (3)A is in good agreement with the values of 1.917A (Huffman, Skupinsky & Caulton, 1982) and 1.901 (7)A (Bryan & Kuczkowski, 1972) reported for Ph3PBH3 and Me3PBH3, respectively. The average H--B--H angle is 113(3) ° and the average P--B~H angle is 106(2) °, both of which agree with the corresponding angles of 115 and 103 °, respectively, in Ph3PBH3 (Huffman et al, 1982).…”

supporting

confidence: 88%

(Dicyclohexylphosphino)borane, BH3PH(C6H11)2, a Precursor to Water-Soluble Phosphine Ligands

Day¹,

Mohr²,

Grubbs³

1996

Acta Crystallogr C

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supporting

confidence: 88%

(Dicyclohexylphosphino)borane, BH3PH(C6H11)2, a Precursor to Water-Soluble Phosphine Ligands

Day¹,

Mohr²,

Grubbs³

1996

Acta Crystallogr C

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“…The P-B distance in (CH3)3PBH3, the only other trimethylphosphine complex for which structural data have been reported (Bryan & Kuczkowski, 1972), is 1.901 A which is shorter by 0.02 to 0.06 A than any of the P-B distances in the compounds studied here. In the trimethylamine series, the B-N distance in the BH3 complex has been reported at 1.609 A which is very nearly identical with the same distance in the BCI3 complex (1.611 ,~) and longer than the B-N distances in the bromo and iodo complexes.…”

Section: Discussionmentioning

confidence: 46%

“…The present work was undertaken to provide results which could be compared with those from the trimethylamine-boron halide series (Clippard, Hanson & Taylor, 1971) and also to provide the necessary basis for a satisfactory spectroscopic study. No previous structural studies of any trimethylphosphine-boron halide complexes were found in the literature although a microwave study of the trimethylphosphine-borane complex has been reported (Bryan & Kuczkowski, 1972) in which the P-B distance was found to be 1.901 A. In other Lewis complexes involving phosphorus and boron, P-B distances have varied from about 1.83 to 1.96 A (Kuczkowski & Lide, 1967;Pasinski & Kuczkowski, 1971).…”

Section: Introductionmentioning

confidence: 99%

The crystal and molecular structures of the trimethylphosphine–boron trihalide complexes: (CH₃)₃PBCl₃, (CH₃)₃PBBr₃ and (CH₃)₃PBI₃

Black¹,

Taylor²

1975

Acta Crystallogr Sect B

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An X-ray diffraction study of single crystals of the trimethylphosphine complexes of BCI3, BBr3 and BI3 has shown the chloro and bromo complexes to have P21/m monoclinic unit cells with Z= 2, and the iodo complex to have a Prima orthorhombic unit cell with Z=4. Unit-cell parameters are as follows:TMP.BCIa, a=6.957(1), b=10.630(1), c=6"476(1) A, fl=112.76(1)°; TMP.BBra, a=7"091 (2), b= 10"996 (2), c=6"672 (1) .~, fl= 112-38 (1)°; TMP.BI3, a= 13-033 (1), b= 11.636 (1), c=7-282 (1) ,~. The structures were solved with the help of three-dimensional sharpened Patterson functions and show the chloro and bromo compounds to be isomorphous. Refinement of 761,855 and 567 observed reflections for the chloro, bromo and iodo compounds, respectively, using anisotropic thermal factors yielded conventional R values of 0"044, 0-047 and 0"033. The molecules are shown to possess a P-B dative bond, a staggered conformation and effective 3m (Cao) symmetry. Average P-C bond lengths for the chloro and bromo complexes are 1"81 (1) A while the P-C distance in the iodo complex is 1.845 (12) A. The three P-B distances are 1.957 (5), 1.924 (12) and 1.918 (15) A, respectively, while the boron-halogen bond distances average 1.855 (5), 2.022 (7) and 2.249 (12) A. The C-P-C bond angles are very nearly tetrahedral, with no trend noticeable. The X-B-X angles are somewhat larger and close to 111 ° and also show no trend.

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“…64408(20) .37546(19) .0575( 12)* C (23) .6086(10) .5509 ( 7 ) ,4195 ( 7 ) .087 ( 6 ) * C (24) .6196(10) .7402 ( 7 ) .3919 ( 7 ) .084 ( 6 ) * C (25) .4142 ( 9 ) .6598 ( 9 ) .4343 (6) .095 ( 6 ) *…”

Section: U(12) P ( L )mentioning

confidence: 99%

Contributions to the chemistry of boron, 188. Synthesis and Structures of New 1,3,2,4‐Diphosphadiboretanes

Kölle¹,

Linti²,

Nöth

et al. 1988

Chem. Ber.

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Three methods have been devised to prepare new diphosphadiboretanes: a) Base‐induced hydrogen halide elimination from (amino)phosphinoboron halides precursors, b) tris(trimethylsilyl)‐phosphane elimination from R2NB[P(SiMe3)2]2 intermediates prepared in situ from combinations of R2NB(Cl)P(SiMe3)2 and LiP(SiMe3)2, and c) organylphosphane elimination from aminobis(organylphosphino)boranes R2N‐B(PHR′)2. The molecular structures of three new 1,3,2,4‐diphosphadiboretanes (3, 4a, 4c) were determined by X‐ray diffractometry. These are characterized by a planar four‐membered B2P2 ring with the phosphorus substituents in trans positions. Their BP bonds represent single bond distances. Experimental results are compared with MNDO III calculations which reveal a low barrier (ΔE = 5 kcal/mol) for the dimerization of the boraphosphene H2NBPMe to the diphosphadiboretane (H2NBPMe)2.

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Microwave spectra, structures, and dipole moments of trimethylphosphine-borane and methylphosphine-borane

Cited by 107 publications

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(Dicyclohexylphosphino)borane, BH3PH(C6H11)2, a Precursor to Water-Soluble Phosphine Ligands

(Dicyclohexylphosphino)borane, BH3PH(C6H11)2, a Precursor to Water-Soluble Phosphine Ligands

The crystal and molecular structures of the trimethylphosphine–boron trihalide complexes: (CH₃)₃PBCl₃, (CH₃)₃PBBr₃ and (CH₃)₃PBI₃

Contributions to the chemistry of boron, 188. Synthesis and Structures of New 1,3,2,4‐Diphosphadiboretanes

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Microwave spectra, structures, and dipole moments of trimethylphosphine-borane and methylphosphine-borane

Cited by 107 publications

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(Dicyclohexylphosphino)borane, BH3PH(C6H11)2, a Precursor to Water-Soluble Phosphine Ligands

(Dicyclohexylphosphino)borane, BH3PH(C6H11)2, a Precursor to Water-Soluble Phosphine Ligands

The crystal and molecular structures of the trimethylphosphine–boron trihalide complexes: (CH3)3PBCl3, (CH3)3PBBr3 and (CH3)3PBI3

Contributions to the chemistry of boron, 188. Synthesis and Structures of New 1,3,2,4‐Diphosphadiboretanes

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The crystal and molecular structures of the trimethylphosphine–boron trihalide complexes: (CH₃)₃PBCl₃, (CH₃)₃PBBr₃ and (CH₃)₃PBI₃