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/)
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), Vol. 27:22
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
SYNTHESIS
BORON COMPOUNDS
METHYL RADICALS
PHOSPHINES
BORON 11
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
NMR SPECTRA
PHOSPHORUS 31
ALKYL RADICALS
BORON ISOTOPES
DATA
INFORMATION
ISOTOPES
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
RADICALS
SPECTRA
STABLE ISOTOPES
400201* - Chemical & Physicochemical Properties
400202 - Isotope Effects
Isotope Exchange
& Isotope Separation