Crystalline nickel complexes with dianionic glucopyranoside ligands have been obtained by the reaction of methyl-D-glucopyranoside (Me-β -D-Glcp) or sucrose (Suc) with the cellulose solvent Ni-tren, an aqueous solution of [(tren)Ni(OH)2], tren = tri(2-aminoethyl)amine. Crystals of a nickel complex of α,α-trehalose (α,α-Tre) form after the reaction of the disaccharide with Ni-Me3 tren, the N,N′,N″-trimethyl analogue of Ni-tren. The metal-binding site is the O3,O4 diolate in [(tren)Ni(Me-β-D-Glcp3,4H−2)] · 5.5H2O; in [(tren)Ni(Suc2’,3’H−2)] · 6H2O, hydrogen-bond-supported O2,O3 chelation in the glucose part of the disaccharide is observed. The same metal-binding site as sucrose is exhibited by α,α-trehalose in [(tren)Ni(α,α-Tre2,3H−2)] ・ 5H2O but without the support by an intramolecular hydrogen bond.