Novel tin supramolecular compounds and coordination polymers: Influence of aromatic dicarboxylates on the crystal structures

摘要

Six tin based coordination compounds containing pyridine-2,5-dicarboxylate (pydc), terephthalate (ta), or naphthalene-2,6-dicarboxylate (ndc) ligands have been synthesized hydro-/solvo-thermally and characterized by single crystal X-ray diffraction. Compounds 1 and 2 are polymorphs with chemical composition of Sn(Hpydc)2 and have strikingly different 1D supramolecular structures due to the different linking mode of the monoprotonated pydc ligand. Compound 1, the major phase, crystallizes in the space group P2_1 (a = 16.4038(8) A, b = 48.092(2) A, c = 19.0217(9) A, β = 90.066(1)°) and compound 2, the minor phase, crystallizes in the space group P2_1 (a = 9.680(3) A, b = 12.793(4) A, c = 12.591(4) A, β = 108.703(7)°). Compound 3, Sn(pydc)(DMF), crystallizes in the space group P2_1/c (a = 11.4932(6) A, b = 8.4885(5) A, c = 12.0493(6) A, β = 100.568(1)°,) with infinite 1D helical chains extended along the crystallographic b-axis. Compound 4, Sn_2(0)(pydc), crystallizes in the space group C2/c (a = 13.5948(14) A, b = 6.6759(7) A, c = 20.200(2) A, β = 90.007(2)°), and is a 3D coordination polymer that contains edge-shared Sn_4O_2 clusters arranged into 1D stair-like structures that are stacked to form small channels. Compound 5, Sn3(O)(ta)_2, which crystallizes in the space group P T (a = 6.9436 (6) A, b = 7.1505(6) A, c = 19.1353(16) A, a = 83.714(1 )°, β = 89.686(1)°, γ = 64.034(1)°) and compound 6, Sn_3(O)(ndc)_2, which crystallizes in the space group P1 -bar(a = 7.0892(10) A, b = 7.2714(10) A, c = 23.400 (3) A, a = 86.699(2)°, β = 85.914(2)°,γ= 63.423(2)°), are structurally related and form tin oxide layers consisting of bridged Sn_3O clusters, that are connected to adjacent layers by the ta and ndc ligands, respectively.