JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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A new copper(II) supramolecular coordination polymer and a dinuclear compound with multifunctional 2-amino-5-sulfobenzoic acid and flexible N-donor ligands: synthesis, structure and characterization.

Multifunctional 2-amino-5-sulfobenzoic acid (H2 afsb) can exhibit a variety of roles during the construction of supramolecular coordination polymers. The pendant carboxylic acid, sulfonic acid and amino groups could not only play a role in directing bonding but could also have the potential to act as hydrogen-bond donors and acceptors, resulting in extended high-dimensional supramolecular networks. Two new CuII coordination compounds, namely catena-poly[[[diaquacopper(II)]-μ-1,6-bis(1H-1,2,4-triazol-1-yl)hexane-κ2 N4 :N4' ] bis(3-amino-4-carboxybenzenesulfonate) dihydrate], {[Cu(C10 H16 N6 )2 (H2 O)2 ](C7 H6 NO5 S)2 ·2H2 O}n or {[Cu(bth)2 (H2 O)2 ](Hafsb)2 ·2H2 O}n , (1), and bis(μ-2-amino-5-sulfonatobenzoato-κ2 O1 :O1' )bis{μ-1,2-bis[(1H-imidazol-1-yl)methyl]benzene-κ2 N3 :N3' }bis[aquacopper(II)] trihydrate, [Cu2 (C7 H5 NO5 S)2 (C14 H14 N4 )2 (H2 O)2 ]·3H2 O or [Cu2 (afsb)2 (obix)2 (H2 O)2 ]·3H2 O, (2), have been obtained through the assembly between H2 afsb and the CuII ion in the presence of the flexible N-donor ligands 1,6-bis(1H-1,2,4-triazol-1-yl)hexane (bth) and 1,2-bis[(1H-1,2,4-triazol-1-yl)methyl]benzene (obix), respectively. Compound (1) consists of a cationic coordination polymeric chain and 3-amino-4-carboxybenzenesulfonate (Hafsb- ) anions. Compound (2) exhibits an asymmetric dinuclear structure. There are hydrogen-bonded networks within the lattices of (1) and (2). Interestingly, both (1) and (2) exhibit reversible dehydration-rehydration behaviour.

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