1H-Pyrrolopyridine (HL) Ligands in Rhodium(I) and Iridium(I) Chemistry. Crystal and Molecular Strucures of Rh2(μ-L)2(nbd)2> and

Article abstract of DOI:10.1039/DT9850001891

Reactions of 1H-pyrrolo<2,3-b>pyridine (HL) with or compounds give molecular complexes respectively.The latter react with KOH to form binuclear complexes.Carbonylation reactions of the above compounds afford , , or . some related iridium(I) complexes are also reported.Redistribution reactions take place between and yielding <(diolefin)Rh(μ-L)2-Rh(CO)4> complexes. the tetranuclear complex has been isolated by several routes starting from the above mono- or bi-nuclear neutral rhodium complexes.The structures of the complexes and (nbd = norborna-2,5-diene) have been determined by X-ray methods.The former crystallize in the monoclinic space group C2/c with a=16.272(4), b=7.932(2), c=19.198(5) Angstroem, β=112.07(2) deg, and Z=4.Crystals of the latter are monoclinic, space group P2₁/n with Z=2 and a unit cell of dimensions a=11.091(3), b=16.615(6), c=8.531(4) Angstroem, and β=91.63(3) deg.Both structures were solved by Patterson and Fourier methods and refined by fullmatrix least squares to R values of 0.072 and 0.041 respectively.The structure of the binuclear complex consists of two Rh atoms bridged by two anions L co-ordinated through the two N-atoms.Each Rh atom interacts also with the olefinic bonds of a nbd molecule.The ligand L is diordered and distributed in two positions.The structure of the tetranuclear complex consists of two binuclear units joined together through a double chlorine bridge, forming a planar Rh4Cl2 ring.In each binuclear unit a bidentate anion L and a carbonyl group bridge the two Rh atoms, which are directly bonded .

Full text of DOI:10.1039/DT9850001891

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