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.