Nitrogen-centred helical acridiniums with a 6-7-6-6 fused ring skeleton

Key Points

• The research aims to synthesize and characterize helical acridiniums with a specific fused ring structure.
• Synthesis through oxidative ring contraction of a helical azaheptalene
• X-ray crystallography to determine structural properties
• Spectroscopic techniques for optical characterization
• Theoretical studies to analyze configurational stability
• Demonstrated significant configurationally stable helicity
• Observed long-wavelength absorption characteristics
• Chiroptical properties were distinct and notable