Abstract
The ability of solid films of phthalocyanines to form complexes when exposed to pyridine vapours was investigated on the basis of assignments of i.r. spectra. Pyridine was found to form a five-and a six-coordinated complex with iron and zinc phthalocyanines, respectively, but it did not interact with the copper or metalfree compound. It was, however, physisorbed to magnesium phthalocyanine. In solution iron phthalocyanine proved capable of forming a 1-1 as well as a 1–2 complex with pyridine, both equilibrium constants being 2.10 2 M −1 in CCl 4. The 1-1 complex appeared instantaneously, whereas the 1–2 complex was formed in a reaction having a rate constant of 0.1 h −1 at room temperature.
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