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P E (E = B, Al)- Based Ambiphilic Compounds: Intramolecular Donor - Acceptor Interaction and Coordination Chemistry. Marc DEVILLARD Under the supervision of Dr. G. Bouhadir and Dr. D. Bourissou 10 th EWPC, Regensburg. Wednesday , March 20th 2013 .
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PE (E = B, Al)-BasedAmbiphilic Compounds: IntramolecularDonor-Acceptor Interaction and Coordination Chemistry Marc DEVILLARD Under the supervision of Dr. G. Bouhadir and Dr. D. Bourissou 10th EWPC, Regensburg Wednesday, March 20th 2013
Our approach : P-(naphthyl)-B • LB : • >stronglydonating LA : easilytunable >sterics >electronics Kilian et al.Angew. Chem. Int. Ed.2012, 11, 1593 Ishikawa et al.Organometallics1992,51, 10150 • Linker : • >holdLB and LA in close proximity • >to whichextentcanit support LBLA? Sasamori, Tokitohet al.Angew. Chem. Int. Ed.2011, 50, 10940
Preparation of the PBs Twoconsecutivehalogen/lithium exchange, electrophilictrappingsequences. 58 % 56 % 52 %
Geometric and spectroscopic data C1 C3 C2 An interaction isobserved, evenwith B(Mes)2.
Theoreticalstudies • Natural Bond Orbital (NBO) analysis[1] • sPBfoundat the first order : 30-40 % B, 60-70 % P • Natural Pop. Analysis (NPA) % B in sPB acidity of B ↗ ↘ E(2pB) B(Mes)2 B(Cy)2 Boraf. ↗ overlap Bader, R. F. W. Chem. Rev. 1991, 91, 893-928
Theoreticalstudies • Atoms in Molecules (AIM) analysis[2] • Electron densitymaps: existence of a bond critical point (BCP) • 2r(r) > 0 and H(r) > 0 • open-shell interaction in the three cases • important covalent character of the bond P B [2]Bader, R. F. W. Chem. Rev. 1991, 91, 893-928
Conclusion • Rare examples of naphthyl bridged phosphine-boranes, analyzed by spectroscopic, structural and computational methods[3] • Linker, a dual platform • Enforce the LBLA even for the bulky B(Mes)2 • Rigid but flexible enough to respond to LBLA • 31P NMR, 11B NMR, SaB, d(PB), NBO, AIM, the same trend • Existence of a bond • Covalent character increase with the acidity of B • Charges increase on each fragment with acidity of B [3]Inorg. Chem., in press
Coordination of phosphine-alanes on transition metal LA : > stericallyprotected > acidicenough[4,5]? LB : > donating > NMR probe for coord. Fontaine et al. Organometallics2007, 26, 3807 Linker : > Csp2-Al bond > vinylic H : NMR probe? Organometallics2007, 27, 1675 [4]Appelt, C.; Slootweg, J. C.; Lammertsma, K.; Uhl, W. Angew. Chem. Int. Ed. 2013, 52, 1 [5]Appelt, C.; Slootweg, J. C.; Lammertsma, K.; Uhl, W. Angew. Chem. Int. Ed. 2012, 51, 5911
Whatkind of behaviourcanweexpect? Al atom as a Z-type ligand
Rh(I) and Pd(II) [Rh(nbd)Cl]2 31P {1H} d = 27.9 (d, 1JPRh = 145.8 Hz) 1H dvinylic = 7.66 (d, 3JHP = 36.4 Hz) 31P {1H} d = -14.2 1H dvinylic = 7.37 (d, 3JHP = 17.7 Hz) [Pd(allyl)Cl]2 31P {1H} d = 11.6 1H dvinylic = 7.67 (d, 3JHP = 38.6 Hz)
Comparisonwith PB relatedsystems Same type of behaviour but Al is a muchstrongeracid.
Conclusion and perspectives • This P/Al based FLP is a good candidate to study coordination on TM: thanks to itsrigidity (Csp2 linker) thanks to the greatacidity of the Al thanks to Hvinylic convenient NMR probe
And after? • Get insight into new coordination modes Al atom as a Z-type ligand • Studies Pt(0) are in progress…
Thanks to Toulouse, LHFA, LBPB group X-Rays diffraction analyses: S. Ladeira Institut de Chimie de Toulouse Quantum chemicalcalculations: Dr. K. Miqueu Université de Pau, France Muenster, Institut fürAnorganischeundAnalytischechemie Pr. W. Uhl Dr. C. Appelt J. Backs Amsterdam, Department of Chemistry and Pharmaceutical sciences Dr. C. Slootweg Dr. D. Bourissou Dr. G. Bouhadir
Coordination to gold (I) 2 + [Au(SMe2)Cl] 31P NMR spectrum
Coordination to gold (I) No contact between Cl and Au Al stronglypyrimidalyzedSaAl = 346.1° [Au(PMe3)Cl] 31P {1H} d = -3.3 (d, 2JPP = 327.9 Hz) 30.8 (d, 2JPP = 327.9 Hz) Indeed, the aluminumcancreate a free vacant site for the incoming phosphine.