Abstract
Nanosecond transient absorption studies of the lifetimes (τ) of several substituted 1, n-diphenyl-1, n-diyls are reported in polar and non-polar solvents. A para-bromine substituent significantly shortens τ. Substitution of OH in the 1-position makes the lifetime highly solvent dependent. The substituent effect and the dependence of τ on biradical chain length is discussed in terms of spin-orbit coupling in the biradical.
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