Abstract
The reaction of Ph2PCH2PPh2 (dppm) with 4-methylphenacyl bromide and
2-(bromoacetyl)naphthalene in chloroform produce the new phosphonium
salts Ph2PCH2PPh2CH2C(O)C6H4MeBr (1) and
Ph2PCH2PPh2CH2C(O)C10H7Br (2). Further, by reaction of the
monophosphonium salts of dppm with the strong base Et3N the
corresponding bidentate phosphorus ylides, Ph2PCH2P(Ph)(2) =
C(H)C(O)C6H4Me (3) and Ph2PCH2P(Ph)(2) = C(H)C(O)C10H7 (4) were
obtained. The reaction of these ligands with mercury(II) halides in dry
methanol led to the formation of the mononuclear complexes
\HgX2(Ph2PCH2PPh2C(H)C(O)C6H4Me)\ X = Cl (5), Br (6), and I
(7) and \HgX2(Ph2PCH2PPh2C(H)C(O)C10H7)\ X = Cl (8), Br (9),
and I (10). Characterization of the obtained compounds was performed by
elemental analysis, IR, H-1, P-31, and C-13 NMR spectra. The structure
of compounds 3 and 10 are unequivocally determined by single crystal
X-ray diffraction techniques. X-ray analysis of 10 reveals the presence
of mononuclear complex containing Hg atom in a distorted tetrahedral
environment. In all complexes, the title ylides are coordinated through
the ylidic carbon and the phosphine phosphorus. Computational studies on
ligand 4 and complexes 8, 9, and 10 at DFT (B3LYP) level of theory are
also reported. It was shown that the formation of P,C-coordinated 1+1
complex 10 is energetically more favored than corresponding
P,P-coordinated 1+2 product. Supplemental materials are available for
this article. Go to the publisher's online edition of Phosphorus,
Sulfur, and Silicon and the Related Elements to view the following free
supplemental files: Additional figures
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