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DOI: 10.1039/A700204A (Paper) Reference Section for: J. Chem. Soc., Perkin Trans. 2, 1997, 2781-2786

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

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Rosa D. Bailey, M. Grabarczyk, T. W. Hanks and William T. Pennington

Abstract

In both the solid state and in solution, 2,3,5,6-tetrakis(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.

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