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Synthesis and spectroscopic and structural characterization of the monomeric diborylphosphine and diphosphinoborane compounds PhP(BMes/sub 2/)/sub 2/ and MesB(PPh/sub 2/)/sub 2/ (Mes = 2,4,6-Me/sub 3/C/sub 6/H/sub 2/)

Journal Article · · Inorg. Chem.; (United States)
DOI:https://doi.org/10.1021/ic00295a009· OSTI ID:6181434
; ;
The synthesis and spectroscopic and first x-ray structural characterization of a diborylphosphine, PhP(BMes/sub 2/)/sub 2/ (1), and a diphosphinoborane, MesB(PPh/sub 2/)/sub 2/ (2), are described. The structure of 1 has a planar core that involves the phosphorus and two boron atoms and also the five substituent carbons. In addition, the B-P bond lengths are shortened, which suggests a close structural analogy between 1 and the allyl cation. In the case of 2, although the boron remains planar, both phosphorus centers are pyramidal with slightly longer B-P bonds than in 1. Both 1 and 2 are the first examples of their respective classes of compound to be well characterized. Crystal data with Mo K..cap alpha.. radiation (lambda = 0.71069 /angstrom/) at 130 K are as follows. 1: a = 14.302 (4) /angstrom/, b = 15.701 (3) /angstrom/, c = 16.601 (6) /angstrom/, ..beta.. = 109.61 (2)/degrees/; monoclinic, space group C2/c, Z = 4, R = 0.059. 2: a = 7.815 (2) /angstrom/, b = 8.723 (2) /angstrom/, c = 40.147 (10) /angstrom/, ..beta.. = 94.90 (2)/degrees/; monoclinic, space group P2/sub 1//n, Z = 4, R = 0.041. A listing of available /sup 11/B and /sup 31/P NMR data on compounds involving triply connected boron and phosphorus centers is also provided and discussed in the context of the data for 1 and 2. 25 references, 2 figures, 4 tables.
Research Organization:
Univ. of California, Davis (USA)
OSTI ID:
6181434
Journal Information:
Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 27:22; ISSN INOCA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
ALKYL RADICALS
AROMATICS
BORON 11
BORON COMPOUNDS
BORON ISOTOPES
CRYSTAL STRUCTURE
DATA
EXPERIMENTAL DATA
INFORMATION
ISOTOPES
LIGHT NUCLEI
METHYL RADICALS
NMR SPECTRA
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
PHOSPHINES
PHOSPHORUS 31
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
RADICALS
SPECTRA
STABLE ISOTOPES
SYNTHESIS