Experimental Studies on the trans-Influence of Boryl Ligands in Square-Planar Platinum(II) Complexes

A series of platinum(II) boryl complexes of general formula trans‐[(Cy3P)2Pt(Br)(BX2)], including the rare dibromoboryl species trans‐[(Cy3P)2Pt(Br)(BBr2)], were synthesized by oxidative addition of the BBr bond of a number of bromoboranes to [Pt(PCy3)2]. X‐ray diffraction studies were performed on...

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Bibliographic Details
Published in:Chemistry : a European journal 2007-01, Vol.13 (25), p.7171-7176
Main Authors: Braunschweig, Holger, Brenner, Peter, Müller, Andreas, Radacki, Krzysztof, Rais, Daniela, Uttinger, Katharina
Format: Article
Language:English
Subjects:
boron
boryl complexes
oxidative addition
platinum
trans-influence
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Summary:A series of platinum(II) boryl complexes of general formula trans‐[(Cy3P)2Pt(Br)(BX2)], including the rare dibromoboryl species trans‐[(Cy3P)2Pt(Br)(BBr2)], were synthesized by oxidative addition of the BBr bond of a number of bromoboranes to [Pt(PCy3)2]. X‐ray diffraction studies were performed on several such compounds. Comparison of the PtBr bond lengths allowed an empirical assessment of the trans‐influence of different boryl ligands. A trans‐influence scale was thus deduced and the results were compared with those previously computed for compounds of the type trans‐[(Me3P)2Pt(Cl)(BX2)]. Boryl is best! A stronger trans‐labilizing ability is exerted by boryl ligands than by other boron‐based groups. This was determined from a comparison of the PtBr bond lengths in a series of new platinum boryl complexes, trans‐[(Cy3P)2Pt(Br){B(X)X′}] with those of known Pt complexes with iminoboryl, base‐stabilized and terminal borylene ligands (values of PtBr bond lengths are listed in Å).
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.200700539