Synthesis, structure and solution conformation of some [(η 5-indenyl)(I 2- n)(R)(L n)CO III] ( n-1)+ ( n = 1, 2; R = perfluoroalkyl; L  P-donor) complexes

Abstract

Reaction of (η 5-indenyl)(I)(R)(CO)Co (R  C 3F 7, C 6F 13) with P-donor ligands yields a series of mono- and disubstituted products [(η 5-indenyl)(I 2- n )(R)(L n )Co] n-1)+ ( n = 1, 2, L  PMe 3; n = 1, L  PPhMe 2, PPh 2Me, PPh 2(OMe), PPh 3). Product distribution is highly ligand dependent and no disubstituted product forms for bulky P-donor ligands. Solution NMR data ( 1H, 13C, 19F) for the racemic, Co-chiral, monosubstituted derivatives support a slightly distorted η 5-indenyl piano stool structure with a preferred conformation which places the perfluoroalkyl group trans to the indenyl 6-ring. The structure of [(C 9H 7)(C 3F 7)(PMe 3) 2Co]I·0.5 CH 2Cl 2 ( 5) was determined by single crystal X-ray diffraction. Compound 5 crystallizes in the monoclinic space group P2 1/ n with a = 16.760(5) Å, b = 10.614(7) Å, c = 28.595(5) Å, β = 96.61 (2)°, V = 5053(3) Å 3, Z = 4 and was refined to R = 0.040 and R w = 0.036 based on 4097 observations with I > 3.00σ,(I).