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Date: 8-7-2018
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Date: 9-9-2019
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Date: 13-9-2019
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Double bonds
In contrast to a single (σ) bond where free rotation is generally assumed, rotation about a double bond is not a low energy process. The presence of a double bond may therefore lead to geometrical isomerism as is observed for N2F2. Each N atom carries a lone pair as well as forming one N__F single bond and an N=N double bond. Structures 1.35 and 1.36 show the trans- and cis-isomers† respectively of N2F2.