Synthesis, spectroscopic analysis and crystal structure of (N-{2-[(2-amino-eth-yl)amino]-eth-yl}-4'-methyl-[1,1'-biphenyl]-4-sulfonamidato)tri-carb-on-ylrhenium(I).

The title compound, [Re(C17H22N3O2S)(CO)3] is a net neutral fac-Re(I)(CO)3 complex of the 4-methyl-biphenyl sulfonamide derivatized di-ethyl-enetri-amine ligand. The NNN-donor monoanionic ligand coordinates with the Re core in tridentate fashion, establishing an inner coordination sphere resulting in a net neutral complex. The complex possesses pseudo-octa-hedral geometry where one face of the octa-hedron is occupied by three carbonyl ligands and the other faces are occupied by one sp 2 nitro-gen atom of the sulfonamide group and two sp 3 nitro-gen atoms of the dien backbone. The Re-Nsp 2 bond distance, 2.173 (4) Å, is shorter than the Re-Nsp 3 bond distances, 2.217 (5) and 2.228 (6) Å, and is similar to the range reported for typical Re-Nsp 2 bond lengths (2.14 to 2.18 Å).