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Influence of the Cross‐linking Agent on the Gel Structure of Starch Derivatives
Hydrogels were synthesized through cross-linking of carboxymethyl starch (CMS; Degree of Substitution DS = 0.45) using polyfunctional carboxylic acids (malic, tartaric, citric, malonic, succinic,Expand
Synthesis and characterization of cross-linked carboxymethyl potato starch ether gels
Hydrogels were synthesized by cross-linking of potato starch (PS) with dichloroacetic acid (DCA) in the presence of monochloroacetic acid (MCA) to form etherified carboxymethyl starch (CMS) gels, toExpand
Lanthanide coordination polymers with tetrafluoroterephthalate as a bridging ligand: thermal and optical properties.
By slow diffusion of triethylamine into a solution of 2,3,5,6-tetrafluoroterephthalic acid and the respective lanthanide salt in EtOH/DMF single crystals of seven nonporous coordination polymers, two-dimensional square grids are obtained and intense emission in the visible region of light for Pr, Sm, and Dy with colors from orange, orange-red, to warm white is revealed. Expand
In tyrosine‐containing di‐ and tripeptides a linear correlation between the 13C‐NMR chemical shift δ of the C2 atom of various aliphatic amino acids and the fluorescence‐quenching constant confirms the hypothesis that electron‐withdrawing and donating groups are modulating the fluorescing efficiency of the peptide group. Expand
Coordination Polymers with Tetrafluoroterephthalate as Bridging Ligand
Seven nonporous coordination polymers with tetrafluoroterephthalate (tfBDC2–) as a bridging ligand were synthesized and structurally characterized. Homoleptic ∞3[Tl2(tfBDC)] (P1, Z = 1, 1) contain...
Optimized Synthesis of Tetrafluoroterephthalic Acid: A Versatile Linking Ligand for the Construction of New Coordination Polymers and Metal-Organic Frameworks
Pure 2,3,5,6-tetrafluoroterephthalic acid (H2tfBDC) is obtained in high yields (95%) by reacting 1,2,4,5-tenzoic acid with a surplus of n-butyllithium in tetrahydrofuran (THF) and subsequent carbonation with CO2 without any extensive purification procedure. Expand
Bright luminescence in lanthanide coordination polymers with tetrafluoroterephthalate as a bridging ligand.
Ten new coordination polymers of the general compositions show that the replacement of organic ligands with C-H groups by perfluorinated ligands leads to compounds with intense emission, as vibrational quenching is reduced. Expand
Influence of Soluble Polymer Residues in Crosslinked Carboxymethyl Starch on some Physical Properties of its Hydrogels
Crosslinked carboxymethyl starch (CMS) was synthesized from potato starch in a single-step procedure with mono- (MCA) and dichloroacetic acid (DCA), using the well-known Williamson reaction. TheExpand