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Issue 24, 2004
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Amine olefin rhodium(I) complexes: pKa and NH bond strength

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A combination of the rigid bis(5H-dibenzo[a,d]cyclohepten-5-yl)amine (trop2NH) and 5-amino-5H-dibenzo[a,d]cycloheptene (tropNH2) ligand allowed the synthesis of the stable pentacoordinated 18 electron amine olefin rhodium(I) complex [Rh(trop2NH)(tropNH2)]O3SCF3 (5); this complex can be cleanly deprotonated [pKaDMSO = 20.6(1)] to the corresponding amide [Rh(trop2N)(tropNH2)] (6) which is reversibly oxidised at −0.466 V (vs. Fc/Fc+). The coordinated NH bond strength in 5 is estimated to be 379 ± 10 kJ mol−1.

Graphical abstract: Amine olefin rhodium(i) complexes: pKa and NH bond strength

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The article was received on 01 Jul 2004, accepted on 03 Sep 2004 and first published on 01 Nov 2004

Article type: Communication
DOI: 10.1039/B409981H
Citation: Chem. Commun., 2004,0, 2820-2821
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    Amine olefin rhodium(I) complexes: pKa and NH bond strength

    T. Büttner, F. Breher and H. Grützmacher, Chem. Commun., 2004, 0, 2820
    DOI: 10.1039/B409981H

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