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ACKNOWLEDGMENTS

Funding:K.S.K. and J.B. acknowledge the Danish Council for

Independent Research (5051-00095A and 8021-00410B) and the

Carlsberg Foundation. N.W.R. acknowledges the Alexander von

Humboldt Foundation within the Feodor-Lynen Fellowship program.

P.P., R.L., and K.W. acknowledge the Swedish Foundation for Strategic

Research. P.P. and K.W. acknowledge the Swedish Research Council.

P.P. acknowledges the Swedish Energy Agency, the Knut and Alice

Wallenberg Foundation, and the Swedish National Supercomputing

Centers LUNARC and NSC via SNIC. K.W. acknowledges the LMK

Foundation, Stiftelsen Olle Engkvist Byggmästare, the Carl Trygger

Foundation, the Wenner-Gren Foundation, the Crafoord Foundation,

Sten K Johnsons Stiftelse, and the Royal Physiographic Society.

Author contributions:K.S.K., P.C., A.H., O.G., N.W.R., J.U., V.S., A.Y.,

and L.L. conducted the femtosecond-to-nanosecond TA and PL

measurements. N.K. conducted all steady-state and time-resolved

spectroscopy related to the excited-state quenching studies and

analyzed the data. O.P. conducted the synthesis. L.A.F. and P.P.

conducted the DFT calculations and theoretical analysis. K.-E.B.

conducted NMR spectroscopy. L.H. and T.E. conducted Mößbauer

spectroscopy. S.S., P.H., and J.B. conducted EPR spectroscopy. J.B.

conducted magnetic susceptibility and magnetization measurements.

D.S. conducted x-ray crystallography. K.S.K., V.S., and P.P. conceived

of and interpreted the photophysics and excited-state cascade. R.L.

conducted electro- and spectroelectrochemistry and emission

spectroscopy; interpreted the electrochemical, spectroscopic, and

photophysical properties; and conceived of and interpreted the excited-

state quenching studies. K.W. conceived of the design and the

synthesis of the ligand and the metal complex. K.S.K., O.P., V.S., P.P.,

R.L., and K.W. wrote the paper with co-writing input from K.-E.B.,

T.E., L.H., P.H., J.B., D.S., and N.W.R. All authors read and commented on

the paper.Competing interests:The authors declare no competing

interests.Data and materials availability:Crystallographic data are

available free of charge from the Cambridge Crystallographic Data

Centre under reference numbers CCDC-1842079 {[Fe(phtmeimb) 2 ]PF 6 }

and CCDC-1842084 {[Fe(phtmeimb) 2 ]BPh 4 }. All other data are

available in the main text or the supplementary materials.

SUPPLEMENTARY MATERIALS

http://www.sciencemag.org/content/363/6424/249/suppl/DC1

Materials and Methods

Figs. S1 to S26

Tables S1 to S5

References ( 35 – 56 )

2 August 2018; accepted 14 November 2018

Published online 29 November 2018

10.1126/science.aau7160

Kjæret al.,Science 363 , 249–253 (2019) 18 January 2019 5of5

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