Synthesis, structure and thermal decomposition of tetra(2-pyridyl)pyrazine⋅I₂ charge-transfer complexes

Authors

Rosa D. Bailey
M. Grabarczyk
Timothy W. Hanks, Furman UniversityFollow
William T. Pennington

ACS Citation

Bailey, R. D.; Grabarczyk, M.; Hanks, T. W.; Pennington, W. T. Synthesis, structure and thermal decomposition of tetra(2-pyridyl)pyrazine⋅I₂ charge-transfer complexes. J. Chem. Soc., Perkin Trans. 2 (1972-1999) 1997, 2781-2786.

Version of Record

10.1039/a700204a

Abstract

In both the solid state and in solution, 2,3,5,6-tetrakis(2-€²-pyridyl)pyrazine (tpp) reacts with iodine to form charge-transfer complexes. The solid state process results in the exclusive production of a mono-I2 adduct, 3, while the solution reaction can produce both 3 and a bis-I2 adduct, 4. The X-ray crystal structure of 4 is described and a structure for 3 is proposed based upon spectroscopic evidence and molecular orbital calculations. The thermal decompositions of 3 and 4 proceed by I2 evolution at very different rates and lead to different polymorphs of tpp. The mechanism of this process is described in terms of solid state reaction theory.

Source Name

Journal of the Chemical Society, Perkin Transactions 2: Physical Organic Chemistry (1972-1999)

Publication Date

1-1-1997

Issue

12

Document Type

Citation

Citation Type

Article