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Reference.org
Charge-transfer complex
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, charge-transfer (CT) complex, or electron donor-acceptor complex, describes a type of <a href="/facts/Supramolecular_assembly/owSHJkaX">supramolecular assembly</a> of two or more molecules or ions. The assembly consists of two <a href="/facts/Molecule/N9ljSfFq">molecules</a> that self-attract through <a href="/facts/Electrostatics/bxkuW6s4">electrostatic</a> forces, i.e., one has at least partial negative charge and the partner has partial positive charge, referred to respectively as the <a href="/facts/Electron_acceptor/sRvhMXqH">electron acceptor</a> and <a href="/facts/Electron_donor/7JxwwW43">electron donor</a>. In some cases, the degree of charge transfer is "complete", such that the CT complex can be classified as a salt. In other cases, the charge-transfer association is weak, and the interaction can be disrupted easily by polar solvents. </p>