3 research outputs found
2-D metalloporphyrin coordination network of cobalt-meso-tetra(4-carboxyphenyl)porphyrin
No full text<div><p>A new metalloporphyrin coordination framework [Co(H<sub>3</sub>TCPP)] (H<sub>6</sub>TCPP = meso-tetra(4-carboxyphenyl)porphyrin) has been synthesized hydrothermally. Single-crystal X-ray analysis revealed it exhibits a 2-D layered coordination network structure. Hydrogen bonds are observed between carboxyl groups within the 2-D layer as well as from adjacent layers. The UV–Vis diffuse reflectance spectrum indicates the presence of the expected <i>B</i> (410 nm) and <i>Q</i> (540 and 690 nm) absorption bands. The fluorescence spectrum shows four emission bands centered at 648 nm.</p></div
Synthesis and Characterization of Two- and Three-Dimensional Calcium Coordination Polymers Built with Benzene-1,3,5-tricarboxylate and/or Pyrazine-2-carboxylate
No full textTwo new calcium coordination polymers, [Ca<sub>3</sub>(btc)<sub>2</sub>(H<sub>2</sub>O)<sub>12</sub>] (<b>1</b>)
and [Ca<sub>2</sub>(btc)Â(pzc)Â(H<sub>2</sub>O)<sub>3</sub>] (<b>2</b>) (btc
= benzene-1,3,5-tricarboxylate, pzc = pyrazine-2-carboxylate), have
been synthesized using the hydro/solvothermal method and have been
characterized using X-ray diffraction, IR, UV–vis, thermogravimetric
analysis, and fluorescence analysis. The structure of compound <b>1</b> is a three-dimensional framework consisting of helical chains
of calcium coordination polymers, while that of compound <b>2</b> is a double layered network in which the inorganic zigzag chains
of calcium coordination polyhedra are linked by organic ligands. Both
compounds show blue fluorescence when excited with UV light. Density
functional theory calculations on electronic absorption spectra of
organic ligands and calcium coordination polymers are discussed
