Separation and spectrometric characteristics of “green pigments”—Anomalous components of petroleum vanadylporphyrins

Abstract

1. 1. Polar green components of petroleum vanadylporphyrin concentrates were separated in pure form; these components are responsible for absorption in the range of 595 to 600 nm. 2. 2. Spectrometric data confirm the presence in these compounds of carbonyl groups conjugated with a porphin ring (carbonyl group in the lateral chain, keto-group in the isocyclic ring). 3. 3. Oxidative transformations of petroleum vanadylporpyrins in source rock or during the separation of prophyrins are the most probable origin of “green pigments”. Carbonyl groups may be retained during the formation of petroleum porphyrins from their precursors in the source rocks underlying the petroleum reservoir.