Crystallise the dye from EtOH/H2O (1:1 v/v) and dry in vacuum. Store it in a dark bottle. [Beilstein 16 II 149.]
References
[1] Wang M, et al. Atomically dispersed janus nickel sites on red phosphorus for photocatalytic overall water splitting[J]. Angewandte Chemie International Edition, 2022, 61(29): e202204711.
