Abstract
The complexes [RuClH(cod)(amine) 2] undergo amine exchange reactions with pyridine, γ-picoline or 4-(dimethylamino)pyridine. The crystalstructure of [RuClH(cod)(py) 2] has been determined from three-dimensional X-ray data. It crystallizes in space group P2 1/ n of the monoclinic system; a 11.278(5); b 10.619(9); c 14.231(4) Å; β 90.34(3)°; Z = 4. The structure was solved by standard heavy atom methods and has been refined by least squares to a conventional R factor of 0.038 based on 5535 reflections. The coordination geometry around the ruthenium atom is octahedrally distorded with cis-aminepyridine ligands, the chloro and hydrido ligands being trans to each other and the cyclooctadiene moiety bound through the two double bonds. Principal bond lengths are: Ru-H 1.60(3); Ru-Cl 2.584(1), Ru-N 2.167(2) and 2.153(2) Å. 1H and 13C NMR data are presented for the three complexes. The 13C NMR shifts of the olefin group indicate a large degree of π-back-bonding.
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