Solvothermal syntheses and structures of indium(III)-binaphthalenyl dicarboxylate complexes with yellow/blue luminescence

Two novel In(III) complexes, [In(bna)(Hbna)]n (1) and [In2(bna)2(μ2-OH)2]n·4nH2O (2) (H2bna=2,2′-dihydroxy-1,1′-binaphthyl-3,3′-dicarboxylate acid), have been reported. Complex 1 adopts a 2D layer structure, where each layer composed from homochiral ligands is chiral while the ligands in two neighboring layers are enantiomer. Complex 2 is constructed by individual –In–O–In– chains, which are further connected by bna2− into a 3D honeycomb framework. As a derivative of H2bna ligand, dmbna (3) was recrystallized for structurally comparison with 1-2 (dmbna=dimethyl 2,2′-dihydroxy-1,1′-binaphthyl-3,3′-dicarboxylate). X-ray powder diffractions (XRD) and thermogravimetric analyses (TGA) for 1-2 show that they are highly thermally stable in the solid state. Complexes 1 and 2 exhibit the intense yellow luminescence at 573 nm and blue luminescence at 459 nm at room temperature, respectively. And an astonishing blue shift of 105 nm is observed for complex 1 when it is measured at 10 K.