Electronic communication across N-linked unconjugated polymers: important insight into the charge transfer processes of polyaniline

Abstract

The [C6H4C≡CPtL2C≡CC6H4] → quinone charge transfer bands in unconjugated ([Pt]-NMe-Q)n's are similar to the conjugated systems showing that the NMe secures communication.

Drastic Tuning of the Photonic Properties of «(Push–Pull)n» trans‐Bis(ethynyl)bis(Tributylphosphine)Platinum(II)‐Containing Polymers

“…The large Stoke shifts (Δ expressed in a linear scale of energy) are large, and the emission lifetimes, τ e , for both 1 and 2a are in the μs time scale, meaning that these luminescence processes are phosphorescence, i.e., T 1 →S 0 . This finding contrasts drastically with two series of recent reports . [6c] Indeed, for a series of polymers exhibiting the [Pt] –(thiophene) m –2,7‐ AQ –(thiophene) m – [Pt] unit ( P4a,b ; Scheme ), no phosphorescence was observed.…”

“…Recently, the strategy to increase the efficiency of bulk heterojunction solar cells based on conjugated polymer was set on «(push–pull) n » structures . In this respect, our group used appropriately substituted quinonediimines ( QN 2 ) and anthraquinone diimines ( AQN 2 ) as tunable electron acceptors connected to trans ‐bis(ethynyl)bis‐(phosphine)platinum(II) as an electron‐rich unit, [Pt] , for the «(push–pull) n » design, and the photophysical properties of these tailored polymers ( P1a–e , P2a–c , P3 ; Scheme ) were thoroughly investigated . In all cases, the absorption spectra are characterized by a broad low‐energy charge transfer (CT) band arising from [Pt] → QN 2 or [Pt] → AQN 2 , which is highly sensitive to substitution and the structure of the acceptor, and higher energy π–π* features centered on the [Pt] chromophore.…”

A para‐C–H Functionalization of Aniline Derivatives via In situ Generated Bulky Hypervalent Iodinium Reagents

“…A similar radical coupling reaction was observed with 1‐phenyl‐1 H ‐pyrrole‐2,5‐dione, providing a single product ( 35 ) (Scheme d). This compound ( 35 ) was utilized as conjugate acceptor for bioconjugation, and precursor for synthesis of natural products and electronic communication materials . Interestingly, 35 could be purified without use of chromatography and recrystallization, which further shows the value of this protocol.…”

Azophenine as Central Core for Efficient Light Harvesting Devices

“…Therefore, a smaller C 6 H 4 ‐NH‐quinone diimine dihedral angle is possible. Consequently, the electronic communication through the ‐NH‐ bridge is favoured with the smaller angle. The total energies computed for tautomer 1 (−12309.82781) and tautomer 2 (−12309.82960 a.u.)…”

“…The imine function can promote π‐conjugation. Concurrently, our team and other groups have also demonstrated that electronic communication through a ‐(NR)‐ linker (R=H; alkyl) is possible . The azophenine dye 1 contains both the needed imine and amine linkages.…”