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This research investigates how the position of cyano substitutions in cyanoindole influences its electronic properties.

February 2, 2026Bulletin of the Korean Chemical Society0 citationsOpen Access

Cover Picture: Substituent Position–Driven Modulation of Excited‐State Dynamics in Cyanoindole: Jet‐Cooled Spectroscopic and Theoretical Insights (BKCS 1/2026) by Ahreum Min, Hakseung Ryu, Jiwon Kim, Cheol Joo Moon, Myong Yong Choi

Key Points

This research investigates how the position of cyano substitutions in cyanoindole influences its electronic properties.
Jet-cooled spectroscopy to observe electronic structures.
Theoretical analysis of π-electron distribution and HOMO characteristics.
Comparison of R2PI spectra for different positional variants (5-CNI and 6-CNI).
Repositioning the cyano group alters π-electron distribution.
Distinct differences in electronic character arise from the positional change.
HOMO analysis reveals varying orbital phases linked to location of cyano substitution.

Abstract

The cover image illustrates how repositioning the cyano substitution site between 5‐CNI and 6‐CNI reshapes the π‐electron distribution. Side views of the HOMOs highlight the orbital phase, contrasting the electron density differences at the C5 and C6 positions. Furthermore, the R2PI spectra demonstrate how this single positional change leads to distinct excited‐state electronic character. Details are in the article by Ahreum Min, Hakseung Ryu, Jiwon Kim, Cheol Joo Moon, and Myong Yong Choi . image

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