• Chinchan, Kunlanit
• Chainok, Kittipong
• Jiajaroen, Suwadee
• Laksee, Sakchai
• Theppitak, Chatphorn
• Sukwattanasinitt, Mongkol

Abstract

<jats:p>Reacting trimesic acid (H<jats:sub>3</jats:sub>TMA, C<jats:sub>9</jats:sub>H<jats:sub>6</jats:sub>O<jats:sub>6</jats:sub>) with CaCl<jats:sub>2</jats:sub> and <jats:italic>M</jats:italic>Cl<jats:sub>2</jats:sub> at 110 °C under hydrothermal conditions gave the isostructural heterobimetallic coordination polymers (CPs) <jats:italic>catena</jats:italic>-poly[[tetraaquazinc(II)]-μ-5-carboxybenzene-1,3-dicarboxylato-[tetraaquacalcium(II)]-μ-5-carboxybenzene-1,3-dicarboxylato], [CaZn(HTMA)<jats:sub>2</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>8</jats:sub>]<jats:sub><jats:italic>n</jats:italic></jats:sub>, <jats:bold>1</jats:bold>, and <jats:italic>catena</jats:italic>-poly[[tetraaquacobalt(II)]-μ-5-carboxybenzene-1,3-dicarboxylato-[tetraaquacalcium(II)]-μ-5-carboxybenzene-1,3-dicarboxylato], [CaCo(HTMA)<jats:sub>2</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>8</jats:sub>]<jats:sub><jats:italic>n</jats:italic></jats:sub>, <jats:bold>2</jats:bold>. Compounds <jats:bold>1</jats:bold> and <jats:bold>2</jats:bold> crystallize in the monoclinic space group <jats:italic>C</jats:italic>2/<jats:italic>c</jats:italic>. The solid-state structures consist of eight-coordinate Ca<jats:sup>II</jats:sup> ions and six-coordinate <jats:italic>M</jats:italic><jats:sup>II</jats:sup> ions. These ions are connected by a doubly deprotonated HTMA<jats:sup>2−</jats:sup> ligand to create a one-dimensional (1D) zigzag chain. Poly[[decaaquabis(μ<jats:sub>3</jats:sub>-benzene-1,3,5-tricarboxylato)calcium(II)dizinc(II)] dihydrate], {[CaZn<jats:sub>2</jats:sub>(TMA)<jats:sub>2</jats:sub>(H<jats:sub>2</jats:sub>O)<jats:sub>10</jats:sub>]·2H<jats:sub>2</jats:sub>O}<jats:sub><jats:italic>n</jats:italic></jats:sub>, <jats:bold>3</jats:bold>, was found incidentally as a minor by-product during the synthesis of <jats:bold>1</jats:bold> at a temperature of 140 °C. It forms crystals in the orthorhombic space group <jats:italic>Ccce</jats:italic>. The structure of <jats:bold>3</jats:bold> consists of a two-dimensional (2D) layer composed of [Zn(TMA)] chains that are interconnected by Ca<jats:sup>II</jats:sup> ions. The presence of aromatic carboxylic acid ligands and water molecules, which can form numerous hydrogen bonds and π–π interactions, increases the stability of the three-dimensional (3D) supramolecular architecture of these CPs. Compounds <jats:bold>1</jats:bold> and <jats:bold>2</jats:bold> exhibit thermal stability up to 420 °C, as indicated by the thermogravimetric analysis (TGA) curves. The powder X-ray diffraction (PXRD) data reveal the formation of unidentified phases in methanol and dimethyl sulfoxide, while <jats:bold>1</jats:bold> exhibits chemical stability in a wide range of solvents. The luminescence properties of <jats:bold>1</jats:bold> dispersed in various low molecular weight organic solvents was also examined. The results demonstrate excellent selectivity, sensitivity and recyclability for detecting acetone molecules in aqueous media. Additionally, a possible sensing mechanism is also outlined.</jats:p>

Topics

• impedance spectroscopy
• compound
• photoluminescence
• polymer
• phase
• chemical stability
• powder X-ray diffraction
• Hydrogen
• thermogravimetry
• two-dimensional
• Calcium
• molecular weight
• one-dimensional
• space group
• carboxylic acid