The reaction of Pb(II) salts and mono- or disulfonates leads to the formation of eight new Pb(II)-mono/disulfonate complexes, [Pb(L1)(H2O)]2 (1), [Pb4(L2)2(AcO)2]n·5nH2O (2), [Pb(L3)(H2O)]2 (3), [Pb(HL4)(H2O)2]n·nH2O (4), [Pb(HL5)(H2O)2]n·2nH2O (5), [Pb(H2L6)(H2O)]n·nDMF·2nH2O (6), [Pb2(H3L7)4(H2O)6]·2H2O (7) and [Pb(H2L7)(H2O)]n·nH2O (8) (H2L1 = 2-hydroxy-5-methyl-benzenesulfonic acid, H3L2 = 2-hydroxyl-5-methyl- 1,3-benzenedisulfonic acid, H2L3 = 2-hydroxy-5-nitro-benzenesulfonic acid, H3L4 = 2-hydroxyl-5-bromo-1,3- benzenedisulfonic acid, H3L5 = 2-hydroxyl-5-carboxyl-benzenesulfonic acid, H4L6 = 2,5-dihydroxyl-3-carboxyl- benzenesulfonic acid, H4L7 = 2,4-dihydroxyl-5-carboxyl-benzenesulfonic acid, DMF = N,N’-dimethyl-formamide, AcO- = acetate), which have been characterized by elemental analysis, IR, TG, PL, powder and single-crystal X-ray diffraction. In view of the primary Pb–O bonds, these eight complexes exhibit diverse dinuclear (1, 3 and 7), helical chain (4), wave-like chain (5), linear chain (6), zigzag chain (8) and layer structure (2), in which the Pb(II) cations present different hemi-directed geometries. Taking the secondary Pb–O bonds into account, chain structure for complex 7, layer motifs for complexes 1 and 3–6, as well as 3-D framework for complex 8 are observed with Pb(II) cations showing more intricate holo-directed geometries. The various coordination modes of these seven different mono/disulfonate anions are responsible for the formation of these multiple structures. Furthermore, the introduction of hydroxyl and carboxyl groups increases the coordination ability of sulfonate to the p-block metal cation. Luminescent analyses indicate that complex 7 presents purple emission at 395 nm at room temperature.
Journal of Solid State Chemistry – Elsevier
Published: Jun 1, 2018
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