On the nature of the spin exchange interaction in poly (m-aniline)

Pyrene as Chromophore and Electrophore: Encapsulation in a Rigid Polyphenylene Shell

“…Reduction of dendronized pyrenes 11 a and 21 was carried out on a potassium mirror under high vacuum in absolute THF by using a technique previously described. [30] Formation of the charged species was followed by EPR and UV/Vis spectroscopy (for UV/Vis spectra, see Supporting Information). On contact with the potassium mirror the color of the solution of second-generation dendrimer 11 a turned from light yellow to green, and two absorption bands at 456 and 640 nm appeared in the UV/Vis spectrum.…”

π-Conjugated Anions: From Carbon-Rich Anions to Charged Carbon Allotropes

“…An explanation is provided by the size of the orbital coefficients of the SOMO calculated for the bridgehead carbons. [81] A stable diamagnetic dianion is obtained upon contact of 37 with the reducing metal. [79] Semiempirical calculations showed a decrease of 12.1°in the torsion angle and an increase in the double bond character at the inter-ring bond as a direct result of the reduction.…”

Nonclassical Conducting Polymers: New Approaches to Organic Metals?

“…In this case, the ground state is nonmagnetic dielectric with a band gap DE b 1.5 eV. [27] The type MP may be anticipated by substitution of two or more carbon p-centers. A nonmetallic (high-spin) to metallic (low-spin) transition may be probably achieved by substitution of the active p-centers in polymer 9 with different substituents R i within the meta-phenylene rings as indicated in 13.…”

“…The polyphenylenemethines (1) have a nonmetallic (high-spin) ground state with ferromagnetically coupled electrons within the half-filled bandÐcase NP in Figure 2. [3,27,28] Substitution of the exocyclic C . H group with -…”

“…The ground state also remains a high-spin one. [27,28] The case SP may be created by changing the topology. An example is the isoelectronic polymer of the dehydrogenated form of poly(meta-aniline), 12.…”