Citation: Klongdee, Fatima; Boonmak, Jaursup; Youngme, Sujittra (2018). Effect of pH on the charge-assisted hydrogen-bonded assembly of the anionic [Cu(oxalate)~2~]^2{-^} building unit and N,N'-ditopic cations. Acta Crystallographica Section C, 74, pp. -.