Phosphanyl-substituted siloles: synthesis, structural characterization and an unexpected secondary isotope effect in the 31P NMR spectrum at room temperature

Key Points

• The research aims to synthesize and characterize phosphanyl-substituted siloles, focusing on the impact of substituents on their properties.
• Synthesis and structural characterization of phosphanyl-substituted siloles
• Investigation via NMR spectroscopy, single-crystal X-ray diffraction, and DFT calculations
• Examination of electronic and steric effects of substituents, particularly for halogen derivatives
• An unexpected 35Cl/37Cl secondary isotope effect is observed in 31P{1H} NMR spectra at room temperature
• Significant electronic and steric factors affect the properties of the synthesized siloles
• Structural insights gained through DFT calculations and X-ray diffraction support NMR findings