Design, synthesis, and single crystal structure elucidation of modified purine ligands 2-(2-amino-9H-purin-9-yl) acetic acid (L1) and 2-(2,6-diamino-9H-purin-9-yl) acetic acid (L2) and their interaction with certain d(10) transition metal ions is described. Copper complex 1 (C28H34Cu2N22O19) afforded a two-dimensional polymeric structure composed of metallaquartets, while corresponding silver complex 2 (C14H26AgN10O8) was formed as a discrete dimer. Complexes 3 (C14H24CdN10O10) and 5 (C14H22CdN12O8), cadmium complexes of L1 and L2, respectively, afforded different coordinating modes, where 3 resulted in a two-dimensional (2D) polymeric structure consisting of metallaquartets and 5 as a discrete dimeric structure, with an octahedral coordination geometry. Complex 4 (C14H13Cl13Hg6N10O8) afforded a unique hexanuclear, 2D polymeric structure, supported by mercury-chloride bridges, presenting as interconnected dimeric, trimeric, and hexameric mercury halide (mu(2double), mu(3triple,) and mu(6six)) clusters. The potential of halide ions as bridges is interesting. We have also studied the fluorescence properties of ligand L1 and L2 along with complexes 1-5.
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