Characterization of thin films of regioregular poly(alkylthiophene)s bearing optically active substituents

Angiolini, Luigi; Brazzi, Alice; Grenci, Valeria; Salatelli, Elisabetta; Catellani, M.; Luzzati, Silvia

doi:10.1515/epoly.2009.9.1.585

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“…Catellani, Abbate, and co-workers investigated solution and solid-state aggregates of several regioregular poly(3-alkylthiophene)s with optically active substituents. , Interestingly enough, by applying exciton theory formulas in combination with X-ray geometrical data, they were able to extract very reasonable estimates of interchain twist angles from the measured g abs values. Later on, the same group studied the impact of solvent dipping for improving the ECD response in spin-coated films of chiral poly(3-alkylthiophene)s, highlighting the impact of the film preparation procedure on the packing of the side chains and the planarity of the main chains. , Very recently, Swager and co-workers studied the ECD properties in thin films of chiral poly(3-alkylsulfone)thiophenes with main-chain helicity to explore a possible application in magneto-optic devices: interestingly, freshly prepared spin-coated samples revealed a helically ordered supramolecular structure, very similar to the solution phase one; instead, after thermal annealing at 150 °C a totally different ECD response was found, arising from a chiral structure with opposite helicity which is thermodynamically favored . It is important to stress that the ECD spectra of chiral PTs with main-chain helicity are very different from those of most common PTs, which are substantially planar and exhibit instead supramolecular (or interchain) chirality.…”

Section: Ecd Properties In Thin Films Of π-Conjugated Systems: Litera...mentioning

confidence: 99%

Chiroptical Properties in Thin Films of π-Conjugated Systems

2020

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Chiral π-conjugated molecules provide new materials with outstanding features for current and perspective applications, especially in the field of optoelectronic devices. In thin films, processes such as charge conduction, light absorption, and emission are governed not only by the structure of the individual molecules but also by their supramolecular structures and intermolecular interactions to a large extent. Electronic circular dichroism, ECD, and its emission counterpart, circularly polarized luminescence, CPL, provide tools for studying aggregated states and the key properties to be sought for designing innovative devices. In this review, we shall present a comprehensive coverage of chiroptical properties measured on thin films of organic π-conjugated molecules. In the first part, we shall discuss some general concepts of ECD, CPL, and other chiroptical spectroscopies, with a focus on their applications to thin film samples. In the following, we will overview the existing literature on chiral π-conjugated systems whose thin films have been characterized by ECD and/or CPL, as well other chiroptical spectroscopies. Special emphasis will be put on systems with large dissymmetry factors (g abs and g lum) and on the application of ECD and CPL to derive structural information on aggregated states.

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