Supramolecular dendrimers: Unusual mesophases of ionic liquid crystals derived from protonation of DAB dendrimers with facial amphiphilic carboxylic acids
作者:Andrew G. Cook、Ute Baumeister、Carsten Tschierske
DOI:10.1039/b415892j
日期:——
Supramolecular liquid crystalline (LC) dendrimers were prepared by self-assembly of first to fifth generation amino terminated DAB dendrimers with facial amphiphilic carboxylic acids. These carboxylic acids are composed of three distinct incompatible segments, a rigid rod-like terphenyl core, two terminal alkyl chains and a polar lateral carboxylate group. The COOH groups were either directly connected to the terphenyl core or via oligo(oxyethylene) chains of different lengths. Depending upon the length of the polyether chain used, the dendrimer generation, the ratio of dendrimer to carboxylic acid or the temperature, a series of six different LC phases were observed. As well as a smectic phase (SmA), two different square columnar phases (Colsqu), a mesophase combining a layer structure with a hexagonal organisation of columns (channelled layer phase, ChLhex) and two additional mesophases (Colhex and M) with unknown structures were found. The square columnar phases are either composed of square cylinders (plane group p4mm) or a regular arrangement of square and triangular cylinders (plane group p4gm). In these dendrimer–carboxylic acid complexes protons are transferred from the COOH groups to the amino groups of the dendrimer, which gives rise to ionic complexes (dendroelectrolyte–amphiphile complexes). This concept allows the tailoring of the mesomorphic properties in a thermodynamically controlled self assembly process. The T-shaped ternary amphiphilic structure of the acid components and the incompatibility of the ionic species formed during the self assembly process are responsible for the formation of unconventional mesophase structures.
Templating a polymer-scaffolded dynamic combinatorial library
作者:Clare S. Mahon、Alexander W. Jackson、Benjamin S. Murray、David A. Fulton
DOI:10.1039/c1cc11998b
日期:——
A water soluble polymer-scaffolded dynamic combinatoriallibrary whose members can interconvert through acylhydrazone exchange was prepared and shown to re-equilibrate in the presence of macromolecular templates.
The applicability of these monodispersemagneticmicrospheres in biospecific catalysis and bioaffinityseparation is confirmed by coupling with the enzyme trypsin and huIgG. Trypsin‐modified magnetic PGMA‐COOH and PHEMA‐COOH microspheres are investigated in terms of their enzyme activity, operational and storage stability. The presence of IgG molecules on microspheres is confirmed.
The invention relates to compound of the formula (I) or its salt, in which R
1
, R
2
, R
3
and R
4
are as defined in the description, their use of as medicament, the process for their preparation and use for the treatment of PDE-IV or TNF-α mediated diseases.
[EN] TARGETING CHIMERIC COMPOUND, PHARMACEUTICAL COMPOSITION COMPRISING SAME, PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] COMPOSÉ CHIMÈRE DE CIBLAGE, COMPOSITION PHARMACEUTIQUE LE COMPRENANT, SON PROCÉDÉ DE PRÉPARATION ET SON UTILISATION<br/>[ZH] 靶向嵌合化合物、含其的药物组合物及其制备方法和用途