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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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Abstract

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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Article information


Submitted
01 Jul 2004
Accepted
03 Sep 2004
First published
01 Nov 2004

Chem. Commun., 2004, 2820-2821
Article type
Communication

Amine olefin rhodium(I) complexes: pKa and NH bond strength

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

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