Abstract
Petroporphyrins are geochemical marker molecules that could provide evidence for the biogenic origin of crude oil. Despite the standing interest in their properties, the structure of the condensed phase has not received due attention so far. Here we report on the optical absorption, microscopic structure and molecular ordering in thin vacuum-deposited films of four closely related compounds of petroporphyrin family (transition metal etioporphyrins) that differ either position of peripheral substituents or by the central metal atom. It is shown that even such minor alteration in the molecular architecture as regioisomerism results in remarkable distinctions in film morphology. The observed structural features can potentially be useful in organic electronics applications.
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