Substantially Conductive Polymers Part 05

2 Conjugation Length Effects on ionization potential and electron affinity Oxidation Potential Reduction Potential 4.4 eV HOMO level LUMO level

3 Conjugation Length Effects on band gap

4 Conjugation Length Effects on absorption wavelength

Substituent Effects on the Ionization Potential (eV) (Small Molecules) 5

6 Substituent Effects on the Ionization Potential (eV)

7 Precursor routes for conducting polymers Ring opening metathesis polymerization (ROMP) (Olefin metathesis polymerization) Radical chain polymerization

8 PPV via Wessling Route require strong oxidant (Dow Chemical route) Anionic chain polymerization bissulfonium salt sulfonium polyeletrolyte

9 mild oxidant work fine Substituent effects: 1. solubility: procesibility, quality of film/coating, application potentials 2. e-effect (donating/withdrawing): HOMO/LUMO, bandgap, coloring, redox, e-density, e-polarizability 3. steric hindrance: chain conformation, packing morphology, e-transport bissulfonium salt sulfonium polyeletrolyte RX NaOH CH 2 O HCl SR 2

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Orientable Copolymers 11

Polymer, 30, 1041 (1989) R. W. Lenz, C. C. Han and M. Lux

13 e e Electron transport: Interchain hopping vs Intrachain moving

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Electron Donating Groups Promote Elimination 16