1. How does the ¹J_C−H coupling constant correlate with the hybridization of the carbon of the C−H bond?

The ¹J_C−H coupling constants directly correlate with the hybridization of the carbon center of a C−H bond with a sp carbon displaying a coupling constant of ~250 Hz, a sp² carbon of 160 Hz and a sp³ carbon of 125 Hz.

2. Can paramagnetic organometallic complexes be studied by NMR spectroscopies?

Yes, but as the paramagnetic compounds display large chemical shifts, they are interpreted in slightly different than the diamagnetic compounds.

3. For what kind of the organometallic compounds, the IR spectroscopy is particularly useful?

The IR spectroscopy is useful for various types of the organometallic compounds, whose ligand stretching bands appear in a distinct region. For example, the carbonyl containing organometallic compounds, for which the C−O stretching band is usually looked at 1700−2200 cm⁻¹.