Design, Synthesis, and Photoluminescence Properties of One-, Two-, and Three-Dimensional Coordination Polymers: Anion-Assisted Argentophillic Interactions as Building Blocks

Five new Ag(I) complexes of the formulae {[Ag2(L1)2(NDS)]3H2O}n (1), {[Ag2(L2)2(NDS)]·2H2O}n (2), {[Ag3(L2)2(IQS)2]·(NO3)·4H2O·2MeOH}n (3), {[Ag2(L3)2(NDS)]·4H2O}n (4), and {[Ag2(L3)2(IQS)]·(NO3)·H2O}n (5) (L1 = 2,5-bis-pyridine-3-ylmethylene-cyclopentanone, L2 = 2,5-bis-pyridine-3-ylmethylene-cyclohexanone, L3 = 2,5-bis-pyridine-4-ylmethylene-cyclopentanone, NDS = naphthalene disulfonate, and IQS = isoquinoline-5-sulfonate) have been synthesized and characterized by elemental analysis, IR, powder X-ray diffraction, and single-crystal X-ray diffraction. Complexes 1–3 were found to have sulfonate supported Ag···Ag interaction, and the sulfonate ions act as linkers to form higher dimensional networks (ladder, two- and three-dimensional networks). The complexes 4 and 5, which contain 4-pyridyl substitution, do not form such Ag···Ag interactions, indicating a clear tendency of 3-pyridyl derivatives to promote such interactions over 4-pyridyl derivatives. This observation was also evidenced by the analysis of Ag(I) complexes in Cambridge Structural Database. Further, complexes 1–5 were found to exhibit solid-state photoluminescence in the green region at room temperature.