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

摘要

Multifunctional 2‐amino‐5‐sulfobenzoic acid (H 2 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 Cu II coordination compounds, namely catena ‐poly[[[diaquacopper(II)]‐μ‐1,6‐bis(1 H ‐1,2,4‐triazol‐1‐yl)hexane‐κ 2 N 4 : N 4′ ] bis(3‐amino‐4‐carboxybenzenesulfonate) dihydrate], {[Cu(C 10 H 16 N 6 ) 2 (H 2 O) 2 ](C 7 H 6 NO 5 S) 2 ·2H 2 O} n or {[Cu(bth) 2 (H 2 O) 2 ](Hafsb) 2 ·2H 2 O} n , (1), and bis(μ‐2‐amino‐5‐sulfonatobenzoato‐κ 2 O 1 : O 1′ )bis{μ‐1,2‐bis[(1 H ‐imidazol‐1‐yl)methyl]benzene‐κ 2 N 3 : N 3′ }bis[aquacopper(II)] trihydrate, [Cu 2 (C 7 H 5 NO 5 S) 2 (C 14 H 14 N 4 ) 2 (H 2 O) 2 ]·3H 2 O or [Cu 2 (afsb) 2 (obix) 2 (H 2 O) 2 ]·3H 2 O, (2), have been obtained through the assembly between H 2 afsb and the Cu II ion in the presence of the flexible N‐donor ligands 1,6‐bis(1 H ‐1,2,4‐triazol‐1‐yl)hexane (bth) and 1,2‐bis[(1 H ‐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.