Binuclear dirhodium(I) complexes with phenyl(2-pyridyl)amido ligands. Crystal and molecular structure of [{Rh(μ- N,N′-PhNPy)(nbd)} 2]·H 2O (nbd = 2,5-norbomadiene)

Abstract

The binuclear amidorhodium(I) complexes [{Rh(μ- N,N′-PhNPyR)(diolefin)} 2] and [{Rh(μ- N,N′-PhNPyR)(CO) 2} 2] [PhNPyR = phenyl(2-pyridyl)- amido, phenyl(4-tertbutyl-2-pyridyl)amido; diolefin = 2,5-norbornadiene, tetrafluorobenzobarrelene] are obtained by reaction of the lithium derivatives LiPhNPyR with the appropriate compound [{RhCl(L 2)} 2] [L 2 = diolefin, (CO) 2] and characterized by analytical and spectroscopic methods. The crystal structure of [{Rh(μ- N,N′-PhNPy)(nbd)} 2]·H 2O has been solved by X-ray diffraction methods. The P2 1 /n monoclinic unit cell has dimensions a = 20.7787(12), b = 15.4540(7), c = 10.0162(3) Å with β = 92.205(4)°. The final R factor is 0.06 for the 3346 observed reflections. The binuclear unit presents a distorted square-planar coordination around each metal centre with a RhRh separation of 2.959(1) Å. The phenyl(2-pyridyl)- amido ligands are bridging the two metallic centres and two 2,5-norbornadiene groups complete the rhodium coordination.