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This cannot rigorously be described as sigma-pi conjugation since sigma and pi here refer to different defining planes, and interaction between orbitals of different symmetries (with respect to the same defining plane) is forbidden.
Tweet. chemistry: one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances. : a particular part of something (such as a situation or activity). : a part of an electrical device that produces heat. a constituent part: as a: any of more than 100 fundamental substances that consist of atoms of only one kind and that singly or in combination constitute all matter b: one of the distinct parts (as a lens) of a composite device (as a microscope) c: one of the basic constituent units (as a cell or fiber) of a tissue.