Abstract and subjects
A geometrically flexible bifunctional (bis)aminophosphine ligand was synthesized in a three-component, one-pot Kabachnik-Fields reaction using
butylphosphine, paraformaldehyde, and 3,5-dimethyl aniline. The product, bis((3,5-dimethylphenyl)aminomethyl)
butylphosphine (
BiAMP
), containing two secondary amines and a tertiary phosphine, was isolated in good yields. Deprotonation of both N-H groups with (trimethylsilyl)methylpotassium (K-CH
SiMe
), followed by salt metathesis with LaI
, YI
, and LuI
generated the corresponding MI(
BiAMP
)(thf)
complexes (M = Y (1), La (2), and Lu (3)) in good yields. A sterically encumbered indene, 1,3-diisopropyl-4,7-dimethyl-1
-indene,
Ind, was deprotonated
and installed
salt-metathesis to generate the organometallic series of η
-indenide complexes, M(
BiAMP
)(η
Ind)(thf) (M = Y (4), La (5), and Lu (6)).
H,
P,
C, and
Y NMR experiments, IR spectroscopy, and single crystal X-ray diffraction (SC-XRD), were used to characterize these complexes. The Y-P coupling constant was found to be variable depending on the modifiable coordination environment of the metal center, indicating potential as both a spectroscopic handle as well as providing insight into the influence of additional ligands on the metal center.