2-Phenylpyridine:  To Twist or Not To Twist?

Kerwin D Dobbs; Karl Sohlberg

doi:10.1021/ct600242m

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2-Phenylpyridine: To Twist or Not To Twist?

Journal article

Peer reviewed

2-Phenylpyridine: To Twist or Not To Twist?

Kerwin D Dobbs and Karl Sohlberg

Journal of chemical theory and computation, v 2(6), pp 1530-1537

Nov 2006

DOI: https://doi.org/10.1021/ct600242m

PMID: 26627023

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Abstract

Density functional theory methods were used to investigate the structures associated with 2-phenylpyridine, ppy, and several of its electronic states. The structure of ppy has the aromatic rings twisted with respect to one another by ∼21°, which is about half the value found for biphenyl. In comparison with ppy, both the isoelectronic cation, ppyH(+), and anion, ppy(-), have larger twist angles. The extent of twisting is governed by the delicate balance between π conjugation and repulsive orbital/steric interactions, and the magnitudes of these interactions were investigated by examining the torsional energy barriers for all three molecular species. In contrast, every one of the investigated open-shell structures [Formula: see text] ppy(•)(+), ppy(•)(-), ppy*, ppyH(+)*, and ppy(-)* [Formula: see text] has coplanar aromatic rings, that is, no twist angle. Frontier molecular orbital analyses reveal that the π-type bonding between the bridging carbons becomes dominant over any repulsive orbital and steric interactions, thereby leading to coplanar rings. Also, the energetics associated with ppy and its various electronic states were investigated and reported.

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Details

Title: 2-Phenylpyridine: To Twist or Not To Twist?
Creators: Kerwin D Dobbs - DuPont Central Research
Karl Sohlberg - DuPont (United States)
Publication Details: Journal of chemical theory and computation, v 2(6), pp 1530-1537
Publisher: American Chemical Society; Washington, DC
Resource Type: Journal article
Language: English
Academic Unit: Chemistry
Web of Science ID: WOS:000241992200007
Scopus ID: 2-s2.0-33846220051
Other Identifier: 991019169344304721

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Collaboration types: Industry collaboration; Domestic collaboration
Web of Science research areas: Chemistry, Physical; Physics, Atomic, Molecular & Chemical