Mechanochromic luminescent materials have attracted intense attention because of their excellent reversible optical behaviour, but the mechanism of the stimuli responsive behaviour remains ambiguous. Herein, a novel naphthaldehyde-based Schiff base,...

In this study, six coordination polymers (CPs), {[Ag2(L)(CF3SO3)]·CF3SO3·2H2O·DMF}n (1), {[Ag(L)]·SbF6·4DMF·H2O}n (2), {[Zn(L)0.5(I)2]·3.75H2O}n (3), {[Cd2(L)(I)4(H2O)(DMF)]·4H2O·3DMF}n (4), {[Hg2(L)(I)4]·H2O·4DMF}n (5) and {[Hg2(L)(Cl)4]·2H2O·3DMF}n (6), were obtained based on the designed X-shaped urea-based ligand. X-ray single crystal diffraction analysis revealed that complex 1 displayed a 3D (3,4)-connected {6·82}{64·82}-tcj net. Complex 2 featured a 2D 4-connected {43·63} sheet. Complexes 3 and 5 exhibited a 1D polymeric loop chain. Complex 4 displayed a 1D polymeric fishbone chain. Complex 6 showed a 2D 4-connected {44·62}-sql sheet. Structural comparison revealed that not only the metal ions, but also the anions played crucial roles in the control of final structures.

C13H11N3O3, Orthorhombic, Pna21 (no. 33), a = 9.2062(6) Å, b = 11.5258(7) Å, c = 11.5263(7) Å, V = 1223.04(13) Å3, Z = 4, Rgt(F) = 0.0377, wRref(F2) = 0.1006, T = 293(2) K.

C26H24Cl2N6O14, monoclinic, P21/c (no. 14), a = 15.7471(18) Å, b = 14.1486(15) Å, c = 13.7894(15) Å, β = 109.588(3)°, V = 2894.5(6) Å3, Z = 4, Rgt(F) = 0.0744, wRref(F2) = 0.2246, T = 293(2) K.

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