Triplet State Studies of Organic Chelating Agents I. Zero-Field Splittings as a Measure of Geometrical Changes

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Abstract
Zero-field splittings have been measured for the triplet states of o-phenanthroline and 2,2′-bipyrldyl in the free and zinc-complexed states. Comparison with hydrocarbon models Indicates that 2,2′-bipyridyl undergoes a significant change in geometry upon complexation. Observations of the δAm=2 transition of 2,2′-biqulnoline indicate that it also undergoes a similar geometrical change.