mediator for useful transformations, and also as a synthon towards
preparation of new complexes is currently under exploration.
The present study shows that 1,3-di(phenylazo)benzene (L)
can undergo facile rhodium-assisted C1–H bond activation and,
depending on the nature of rhodium starting compound, binds
to the metal centre either as an NCN-pincer ligand (I), or as
an NCN-donor with the central carbon bridging two different
rhodium centres (see Fig. 1 bottom). While catalytic potential of
the dirhodium complex 1 is yet to be explored, this study already
demonstrated the promise of the aquo complex 2 as a synthon as
well as a mediator for nitrile hydrolysis.
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Acknowledgements
We thank the referees for their constructive comments, which have
been very helpful in preparing the revised manuscript. We thank
the Department of Science and Technology, New Delhi, India
(grant no. SR/S1/IC-29/2009) for financial assistance. PM thanks
the University Grants Commission, New Delhi for her fellowship
[grant no. 10-2(5)2006(ii)-E.U.II]. HT and AJB thank the EPSRC
(UK) for the award of a single-crystal X-ray diffractometer.
MGBD thanks EPSRC (UK) and the University of Reading for
funds for the Image Plate System.
Notes and references
‡ Selected crystallographic data: for complex 1: C36H26Cl2N8Rh2·
1.5CH3CN, Mr
= 908.95, monoclinic, space group P21/c, a =
◦
˚
˚
˚
15.3407(15) A, b = 13.3922(13) A, c = 19.0850(19) A, b = 103.245(2) ,
3
-1
˚
˚
V = 3816.6(6) A , Z = 4, m = 1.047 mm , T = 150 K, l = 0.71073 A, R1 =
0.0363, wR2 = 0.0819, GOF = 0.84. For complex 2: C18H13Cl2N4ORh, Mr =
˚
˚
475.13, monoclinic, space group C2/c, a = 19.488(5) A, b = 12.271(2) A,
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