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Single-crystal X-ray structure diffraction analysis of (<jats:bold>1<\/jats:bold>) reveals that the bbtz ligand acts as a bridge, linking adjacent Cu<jats:sup>II<\/jats:sup> ions into a two-dimensional cationic (4,4) topological network, in which the coordinated 3-amino-4-carboxybenzenesulfonate (Hasba<jats:sup>\u2212<\/jats:sup>) anion uses its sulfonate group to bind with the Cu<jats:sup>II<\/jats:sup> ion in a monodentate fashion and the carboxylate group remains protonated. The lattice Hasba<jats:sup>\u2212<\/jats:sup> anion resides in the two-dimensional layer and balances the charge. The carboxylate group of the 2-amino-4-sulfonatobenzoate (asba<jats:sup>2\u2212<\/jats:sup>) ligand in (<jats:bold>2<\/jats:bold>) is involved in bidentate coordination, connecting adjacent Cu<jats:sup>II<\/jats:sup> ions into carboxylate-bridged chains which are further bridged by the auxiliary flexible bix ligand in a <jats:italic>trans<\/jats:italic>\u2013<jats:italic>gauche<\/jats:italic> (TG) mode, resulting in the formation of a two-dimensional network architecture. The amino group of the asba<jats:sup>2\u2212<\/jats:sup> ligand in (<jats:bold>2<\/jats:bold>) also takes part in the coordination with the central Cu<jats:sup>II<\/jats:sup> ion. The six-coordinated Cu<jats:sup>II<\/jats:sup> centres in (<jats:bold>1<\/jats:bold>) and (<jats:bold>2<\/jats:bold>) exhibit distorted octahedral coordination geometries. Extensive hydrogen bonding exists in both (<jats:bold>1<\/jats:bold>) and (<jats:bold>2<\/jats:bold>). The interlayer hydrogen bonds in both compounds further extend adjacent two-dimensional layers into three-dimensional supramolecular network architectures. Furthermore, a detailed analysis of the solid-state UV\u2013Vis\u2013NIR (NIR is near IR) diffuse reflectance data indicates that (<jats:bold>1<\/jats:bold>) and (<jats:bold>2<\/jats:bold>) may have potential as wide band gap indirect semiconductor materials. Compounds (<jats:bold>1<\/jats:bold>) and (<jats:bold>2<\/jats:bold>) show reversible and irreversible dehydration\u2013rehydration behaviours, respectively.<\/jats:p>","DOI":"10.1107\/s2053229617014899","type":"journal-article","created":{"date-parts":[[2017,11,9]],"date-time":"2017-11-09T14:55:59Z","timestamp":1510239359000},"page":"1087-1097","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":2,"title":["Preparation and characterization of two new Cu<sup>II<\/sup> supramolecular coordination polymers incorporating sulfobenzoate and flexible heterocyclic ligands"],"prefix":"10.1107","volume":"73","author":[{"given":"Xin","family":"Chu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kou-Lin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"329","published-online":{"date-parts":[[2017,11,9]]},"reference":[{"key":"ky3127_bb1","doi-asserted-by":"crossref","first-page":"11233","DOI":"10.1039\/C6DT01157H","volume":"45","author":"Adarsh","year":"2016","journal-title":"Dalton Trans."},{"key":"ky3127_bb2","doi-asserted-by":"crossref","first-page":"7353","DOI":"10.1002\/chem.200600220","volume":"12","author":"Alaerts","year":"2006","journal-title":"Chem. 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