
TY  - JOUR
A1  - Lynch, Daniel E. 
A1  - Smith, Graham 
A1  - Byriel, Karl A. 
A1  - Kennard, Colin H. L. 
T1  - [4-(<emph type="3">N</emph>,<emph type="3">N</emph>-Dimethylamino)phenyl]diphenylphosphine Oxide and its Partial Oxides: An Isomorphous Crystal Series
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 2003
VL  - 56
IS  - 11
SP  - 1135
EP  - 1139
KW  - 
UR  - https://doi.org/10.1071/CH03089 
N2  - The title compound [4-(N,N-dimethylamino)phenyl]diphenylphosphine oxide (1) has been synthesized and its single-crystal X-ray structure determined. The structures of two &#8216;partial&#8217; oxides of the parent compound, (2) and (3) (50% and 25% oxidized), isolated from the intermediate phosphine reaction product have also been determined, yielding an unusual isomorphous crystal series. An apparent P&#8211;O bond shortening with increasing oxidation is also observed across the series (1)&#8211;(3) (1.480(4), 1.351(4), 1.280(4) &#197; respectively) and is considered an artifact of the structure refinement. The packing in the crystals shows primary one-dimensional chains with weak head-to-tail associations between the oxide oxygen (three-centre) and two hydrogen atoms from separate methyl groups of the N-substituted amine (range C&#8211;H &#8230; O 3.115(4)&#8211;3.356(8) &#197;), extended into a sheet structure by peripheral inter-chain C&#8211;H (aromatic) &#8230; O (oxide) associations. 
ER  -

