Enhanced intersystem crossing in core-twisted aromatics.

ABSTRACT: We describe the design, bottom-up synthesis and X-ray single crystal structure of systematically twisted aromatics 1c and 2d for efficient intersystem crossing. Steric congestion at the cove region creates a nonplanar geometry that induces a significant yield of triplet excited states in the electron-poor core-twisted aromatics 1c and 2d. A systematic increase in the number of twisted regions in 1c and 2d results in a concomitant enhancement in the rate and yield of intersystem crossing, monitored using femtosecond and nanosecond transient absorption spectroscopy. Time-resolved absorption spectroscopic measurements display enhanced triplet quantum yields (Φ _T = 10 ± 1% for 1c and Φ _T = 30 ± 2% for 2d

SUBMITTER: Nagarajan K 

PROVIDER: S-EPMC5477835 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature