Table 1.
Switching states and switching efficiencies (Δ) of record player molecules 1a–j in the PSS at 505 nm and 435 nm in acetone as a non-coordinating solvent. %cis-para and %cis-dia are defined as the proportion of the cis isomer in the paramagnetic and diamagnetic state, and %trans is the total proportion of the trans isomer, which is assumed to be completely diamagnetic at low concentrations.
| R | PSS 505 nm | PSS 435 nm | Δ | ||||||
| %cis-para | %cis-dia | %trans | %cis-para | %cis-dia | %trans | % | |||
| 1aa | -H | 54 | 11 | 35 | <5 | >95 | 54 | ||
| 1ba | -Me | 82 | 3 | 15 | <5 | >95 | 82 | ||
| 1ca | -OMe | >95 | <1 | <5 | <5 | >95 | >95 | ||
| 1da | -Cl | 47 | 15 | 38 | <5 | >95 | 47 | ||
| 1eb | -OH | 42 | 2 | 56 | 16 | 1 | 83 | 26 | |
| 1e−b | -O− | 72 | <1 | 28 | 45 | <1 | 55 | 27 | |
| 1f | -S-t-Bu | 70 | 3 | 27 | <5 | >95 | 70 | ||
| 1g | -[S]2- | –c | –c | –c | –c | –c | –c | –c | |
| 1hb | -SH | 41 | <1 | 59 | 13 | <1 | 87 | 28 | |
| 1h−b | -S− | 44 | 2 | 54 | 10 | <1 | 90 | 34 | |
| 1i | -CN | 11 | 16 | 73 | <5 | >95 | 11 | ||
| 1jb | -COOH | 90 | <1 | 10 | 13 | <1 | 87 | 77 | |
| 1j−b | -COO− | 93 | <1 | 7 | 10 | <1 | 90 | 83 | |
aRecalculated from Dommaschk et al. [4], bdetermined by UV–vis spectroscopy, cnot determined because of very strong intramolecular coordination (Supporting Information File 1, Figure S17).