How much can donor/acceptor-substitution change the responses of long push-pull systems to DC fields?

TL;DR

This paper provides a mathematical framework to understand how donor-acceptor substitution influences the response of long push-pull systems to DC electric fields, supported by detailed model calculations and reinterpretation of recent studies.

Contribution

It introduces a unique mathematical approach to analyze the effects of substitution on push-pull systems' responses, extending the analysis with detailed models and new interpretations of existing research.

Findings

Mathematical analysis yields a definitive answer to the influence of substitution.

Model calculations support the mathematical conclusions.

Reinterpretation of recent studies offers new insights into system responses.

Abstract

Mathematical arguments are presented that give a unique answer to the question in the title. Subsequently, the mathematical analysis is extended using results of detailed model calculations that, in addition, throw further light on the consequences of the analysis. Finally, through a comparison with various recent studies, many of the latter are given a new interpretation.