Abstract
Until recently organic conductors were so scarce that recipes for their synthesis were deemed necessary. Now these recipes seem quaint as organic and polymeric conductors multiply.1 Segregated, rather than mixed, stacking of π-molecular donors (D) and acceptors (A) is indeed required. But conducting polymers show crystallinity not to be essential, while excellent D2X conductors and superconductors have neither crystallographically equivalent sites nor strictly equal transfer integrals t. The physical idea of facile charge fluctuations among nearly equivalent, partly-filled sites supercedes any mathematical statement of equality. Polarizable counter ions, disorder, dimensionality, overlap patterns, etc. have all provided useful but limited insights.
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Soos, Z.G. (1987). Electronic Structure of Linear Charge Transfer Solids. In: Delhaes, P., Drillon, M. (eds) Organic and Inorganic Low-Dimensional Crystalline Materials. NATO ASI Series, vol 168. Springer, New York, NY. https://doi.org/10.1007/978-1-4899-2091-1_4
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