Compared with the ripple of visible Eu-based emission intensity induced by appended [FeN] spin crossover (SCO) units, as detected in the triple-stranded [EuFe()] helicate, the lanthanide-based luminescent detection of Fe spin-state equilibria could be improved significantly if the luminophore emission is shifted toward the near-infrared (NIR) domain. Replacing Eu with Nd in [NdFe()] (i) maintains the favorable SCO properties in acetonitrile [critical temperature = 322(2) K], (ii) saturates nonradiative vibrational relaxation processes in the 233-333 K range, and (iii) boosts the crucial intramolecular Nd → Fe energy transfer rate processes, which are sensitive to the spin state of the Fe metallic center. Consequently, the steady-state NIR Nd(F → I) emission of the luminophore is amplified and linearly correlated with the low-spin-[FeN] and high-spin-[FeN] mole fractions controlled by the SCO equilibrium. This paves the way for a straightforward and direct NIR luminescent reading/sensing of the Fe spin state in single molecules.
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