Supramolecular Properties of a Monocarboxylic Acid-Functionalized "Texas-Sized" Molecular Box.

A new carboxylic acid-functionalized "Texas-sized" molecular box TxSB-COH has been prepared by combining two separate building blocks via an iodide-catalyzed macrocyclization reaction. A single-crystal X-ray diffraction analysis revealed a paired "clip-like" dimer in the solid state. Concentration-dependent behavior is seen for samples of TxSB-COH as prepared, as inferred from H NMR spectroscopic studies carried out in DMSO- d.

Physical Removal of Anions from Aqueous Media by Means of a Macrocycle-Containing Polymeric Network.

Reported here is a hydrogel-forming polymer network that contains a water-soluble tetracationic macrocycle. Upon immersion of this polymer network in aqueous solutions containing various inorganic and organic salts, changes in the physical properties are observed that are consistent with absorption of the constituent anions into the polymer network. This absorption is ascribed to host-guest interactions involving the tetracationic macrocyclic receptor.

Encoding, Reading, and Transforming Information Using Multifluorescent Supramolecular Polymeric Hydrogels.

Traditional (1D, 2D, and 3D) codes are widely used to provide convenient readouts of encoded information. However, manipulating and transforming the encoded information is typically difficult to achieve. Here, the preparation of three fluorescent (blue, green, and red) hydrogels containing both tetracationic receptor-anion recognition motifs and gel-specific fluorophores is reported, which may be used as building blocks to construct through physical adhesion fluorescent color 3D codes (Code A, Code B, and Code C) that may be read out by a smartphone.

Design and synthesis of triazolyl coumarins as Hg2+ selective fluorescent chemosensors.

A series of triazolyl coumarin derivatives L1-L4, with and without spacer groups between the coumarin and the triazole groups, were synthesized as fluorescent sensors to study their binding ability and selectivity toward metal ions. Ligand L3, which contains an acetyl linker between the triazole and the coumarin, exhibited a high selectivity toward Hg(2+) in polar protic solvents MeOH-CHCl(3) (9 : 1, v/v) with fluorescent enhancement, furthermore, it was found to bind two Hg(2+) at a high concentration (>12.5 mM) of Hg(ClO(4))(2).

N-1- and N-2-anthryl succinimide derivatives: C-N bond rotational behaviors and fluorescence energy transfer.

New rigid bicyclic N-anthrylsuccinimide 1a, 1b, 2a, and 2b were prepared. The C(aryl)-N(imide) bond rotational barriers, intra/intermolecular arene-arene interactions, and photophysical properties were investigated. The rotational behaviors are more significantly controlled by the position of C(aryl)-N(imide) connection than the sidewall framework.