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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 d10 transition metal ions is described. Copper complex 1 (C28H34Cu2N22O19) afforded a two-dimensional polymeric structure composed of metallaquartets, while corresponding silver complex 2 (C14H20AgN10O8) 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 (μ2double, μ3triple, and μ6six) 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. [ABSTRACT FROM AUTHOR]

Thereaction of L1H [L1H = 3-(N9-hypoxanthyl)propanoic acid]with Me3SnCl or (n-Bu3Sn)2O afforded the 1D coordination polymers [Me3Sn(L1)]n(1) and [n-Bu3Sn(L1)]n(2), respectively.A similar reaction between L2H [3-{N9-(2-aminopurinyl)}propanoicacid] with (Ph3Sn)2O in a 2:1 ratio affordeda dimer [(L2)(Ph3Sn)L2{Ph3Sn(H2O)}]·3CH3OH·3H2O (3). The reactions of 2-(N9-adeninyl)aceticacid (L3H) and 3-(N9-adeninyl)propanoic acid (L4H) with (Ph3Sn)2O in a 2:1 ratio afforded insoluble intractableproducts, which, upon addition of dilute HCl in methanol, afforded[{Ph2SnCl3(H2O)}(HL3Me)2Cl]·H2O (4) and [(Ph2SnCl4)(HL4Me)2] (5). Complexes 1–5show an extensivesupramolecular organization in the solid state as a result of severalintermolecular interactions, prominent among which are the interactionsbetween the nucleobases. [ABSTRACT FROM AUTHOR]

Thisarticle reports synthesis, design, and luminescent propertiesof a series of structurally interesting coordination frameworks preparedfrom a modified purine ligand, 3-(2-amino-9H-purin-9-yl)propanoic acid (L). Corresponding transition metal complexesreported in this study were unambiguously characterized by X-ray crystallographyto reveal an array of diverse crystallographic signatures reflectingcrystal design around varying coordination geometries of a centralmetal ion. While silver complex 1[C16H18Ag2N10O5] affords formationof coordination framework with embedded dimeric, tetrameric, and pentamericmetallacycles, corresponding copper complexation results in a discretedimer 2[C32H46Cl2Cu2N20O14]. Changing the counteranion fromstrongly coordinating chloride ion to weakly coordinating perchlorateanion resulted in the formation of a 1D coordination polymer 3[C18H26Cl2CuN10O14]. Cobalt complexes 4[C16H32CoN10O12] and 5[C16H30CoN12O16] yielded 2Dgrid-type assembly and a discrete dimer, respectively. Change in pHoffered an interesting effect on the structural outcome of cadmiumcomplexes: acidic and neutral conditions lead to the formation of1D coordination polymer 6[C8H12CdCl2N6O6] and 7[C16H24Cd2N12O14],while basic conditions yielded an unusual porous metal organic framework 8[C9H15CdN5O5.5]. [ABSTRACT FROM AUTHOR]

This communication describes thesynthesis and structure of zinc,cadmium, and mercury complexes of modified N9-substituted 2-aminopurine(2AP) analogues. 2AP is an inherently fluorescent heterocyclic nucleobasewith wide applications in biochemical reactions. Herein, we reporta one-dimensional (1D) polymeric helical chain and discrete arrangementsfor zinc complexes [C8H11N5Cl2Zn] (1) and [C12H15N5O5Zn] (2), a 1D polymeric helicalchain for a Cd complex [C8H11CdI2N5] (3), and a unique example of supported2AP-Hg(II) two-dimensional clusters [C16H21Cl6Hg3N10] (4). The photoluminescenceproperties of free ligand Land complexes 1–4are also presented. [ABSTRACT FROM AUTHOR]