Citation: Reynolds, Joseph E.; Bohnsack, Alisha M.; Kristek, David J.; Guti\'errez-Alejandre, A\'ida; Dunning, Samuel G.; Waggoner, Nolan W.; Sikma, R. Eric; Ibarra, Ilich A.; Humphrey, Simon M. (2019). Phosphonium zwitterions for lighter and chemically-robust MOFs: highly reversible H2S capture and solvent-triggered release. Journal of Materials Chemistry A, 7, pp. 16842-.