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Molecular engineering of a 2,5-dithiophen-2-yl-pyrrole-bridged terpyridine-Fe(II) coordination polymer toward

Yuting Song1, Hui Qiao2, Lin Cheng1

  • 1College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou, 350108, P. R. China. taojiayu@fafu.edu.cn.

Dalton Transactions (Cambridge, England : 2003)
|June 16, 2026
PubMed

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Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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