Chiroptical properties of poly{2, 5‐bis[(S)‐2‐methylbutoxy]‐1, 4‐phenylene vinylene}

Abstract

The photoluminescent and electroluminescent properties of conjugated polymers are, in part, controlled by interchain interactions in solid films. A study of the (chir)optical properties of optically active BMB‐PPV (see Figure) shows that circular dichroism spectroscopy is very powerful in detecting association of the polymer. Two different forms of BMB‐PPV are reported to be present in solution, depending on the solvent.

Chiroptical properties of a chiral-substituted poly(thienylene vinylene)

“…The distinct bisignate character of the CD spectra is reminiscent of exciton coupling and indicates that the optical activity of the p-p* transition is likely a result of a chiral (e. g. skewed) orientation of polymer chains with respect to each other in the microcrystallites. While this conclusion is in full agreement with previous results on chiral dialkoxy substituted polythiophene and poly(p-phenylene vinylene) and seems a common feature of conjugated polymers with optically active side chains [8,10,11], a noticeable difference is the blue shift of the absorption maximum upon aggregation instead of the red shift that is usually observed.…”

“…This intrachain ordering does not result in any optical activity of the p-p* transition, as is demonstrated by the lack of a CD signal. The optical activity observed in a poor solvent such as 1-decanol is attributed to the aggregation of the BMB-PTV chains into chiral superstructures and microcrystallites in analogy with previous results on chiral side chain substituted polythiophenes [8][9][10], polydiacetylenes [18], and poly(p-phenylene vinylenes) [11]. On the other hand, the linear absorption of BMB-PTV in a poor solvent exhibits a noteworthy difference in comparison with these polymers.…”

Polymer Photovoltaic Devices from Stratified Multilayers of Donor-Acceptor Blends

“…Poly[2-methoxy-5-(3¢,7¢-dimethyloctyloxy)-1,4-phenylenevinylene], MDMO-PPV [14,17] was used as a donor, and a soluble methanofullerene [6,6]-phenyl-C 61 -butyric acid methyl ester, PCBM, as an acceptor [1,12] in these devices. Their chemical structures are shown in Figure 1.…”

Optically Active Polysilylenes: State-of-the-Art Chiroptical Polymers

“…This knowledge and understanding of the nature of the polysilylene helix might constitute a bridge between artificial polymers and biopolymers and will assist in designing and controlling new types of helical polymers directed to diverse screw-sense-related properties and applications in the future. polymers bearing enantiopure chiral or bulky side groups have been investigated, including polyisocyanides, [11 -15] polyisocyanates, [16 -24] polyacetylenes, [25 -34] polythienylenes, [35 -45] poly(p-phenylenevinylene)s, [46,47] polycarbodiimides, [48,49] polydiacetylenes, [50 -53] polypyrroles, [54,55] polyanilines, [56] poly(p-phenylene)s, [57] polyfluorenes, [58] and polysilylenes. [59 -81] Nevertheless, understanding the relationship between global and local conformational structures, electronic structure, photophysical properties, and functionality is still an on-going subject.…”