Synthesis, spectroscopic analysis and crystal structure of (N-2- (2-aminoethyl) aminoethyl-4′-methyl-1, 1′-biphenyl-4-sulfonamidato) tricarbonylrhenium (I)

The title compound, Re(C 17 H 22 N 3 O 2 S)(CO) 3 is a net neutral fac -Re(I)(CO) 3 complex of the 4-methylbiphenyl sulfonamide derivatized diethylenetriamine 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-octahedral geometry where one face of the octahedron is occupied by three carbonyl ligands and the other faces are occupied by one sp 2 nitrogen atom of the sulfonamide group and two sp 3 nitrogen atoms of the dien backbone. The Re—N sp 2 bond distance, 2.173 (4) Å, is shorter than the Re—N sp 3 bond distances, 2.217 (5) and 2.228 (6) Å, and is similar to the range reported for typical Re—N sp 2 bond lengths (2.14 to 2.18 Å).