The phosphorescence quantum yield and lifetime of 2‐, 3‐, and 4‐aminopyridine have been measured at 77°K in four solvent systems using 285 and 254 nm excitation. Luminescence polarization measurements in EPA at 77°K provide evidence that the lowest triplet in these molecules is π,π*. Of the three compounds studied only 4‐aminopyridine exhibits vibronic activity in its phosphorescence spectrum and an out‐of‐plane and an in‐plane vibration are readily discernible in its phosphorescence spectrum. No phosphorescence could be detected in methylcyclohexane for the three molecules, whereas it was measurable from EPA, acetonitrile and dichloromethane glasses. The observation suggests that intersystem crossing in these molecules may be strongly dependent upon the nature of the solvent. The O–O band in the phosphorescence spectrum is negatively polarized for all three molecules and the coupling scheme appears to be 1. 4‐Aminopyridine shows evidence for second order vibronic spin‐orbit coupling and the mixing scheme appears to be 3.
Skip Nav Destination
Article navigation
15 July 1973
Research Article|
July 15 1973
Phosphorescence emission and polarization of aminopyridines
S. Hotchandani;
S. Hotchandani
Department of Chemistry, St. John's University, Jamaica, New York 11432
Search for other works by this author on:
A. C. Testa
A. C. Testa
Department of Chemistry, St. John's University, Jamaica, New York 11432
Search for other works by this author on:
J. Chem. Phys. 59, 596–600 (1973)
Article history
Received:
February 10 1972
Citation
S. Hotchandani, A. C. Testa; Phosphorescence emission and polarization of aminopyridines. J. Chem. Phys. 15 July 1973; 59 (2): 596–600. https://doi.org/10.1063/1.1680063
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00
Citing articles via
CREST—A program for the exploration of low-energy molecular chemical space
Philipp Pracht, Stefan Grimme, et al.
GPAW: An open Python package for electronic structure calculations
Jens Jørgen Mortensen, Ask Hjorth Larsen, et al.
DeePMD-kit v2: A software package for deep potential models
Jinzhe Zeng, Duo Zhang, et al.