7373-27-5Relevant articles and documents
C3-Symmetric, amino acid based organogelators and thickeners: a systematic study of structure-property relations
de Loos, Maaike,van Esch, Jan H.,Kellogg, Richard M.,Feringa, Ben L.
, p. 7285 - 7301 (2007)
A class of C3-symmetric amino acid based organogelators and thickeners featuring a rigid core have been developed. Structural variation yielded a number of compounds, the aggregation behaviour and resulting aggregates and gels of which were studied by FTIR spectroscopy, dropping ball measurements, differential scanning calorimetry and transmission electron microscopy. These studies showed that the nature of the core unit, the type of hydrogen-bonding units and the applied amino acids have a strong influence on the interactions, resulting in large differences in aggregation properties, thermal stability and morphology between the various compounds. The results provide a basis for a better understanding of the relation between aggregate/gel properties and molecular structure. The structural variation available for these compounds allows fine-tuning of the gelators with respect to aggregation behaviour and gel properties.
De Novo Tailoring Pore Morphologies and Sizes for Different Substrates in a Urea-Containing MOFs Catalytic Platform
Ju, Zhanfeng,Yan, Shichen,Yuan, Daqiang
, p. 2000 - 2010 (2016/05/09)
To better understand the structure-catalytic property relationship, a platform of urea-containing MOFs with diverse topologies as hydrogen-bonding (H-bond) catalyst has been well established in the present work. During the construction of MOFs, we proposed a new strategy called the isoreticular functionalization approach in which the desired topological net is first considered as a blueprint, and then two predesigned functionalized polydentate ligands link to four different metal clusters by de novo routes to achieve the MOFs with expected pore structure and catalytic sites. By means of this strategy, we successfully synthesized four programmed MOFs (named as URMOF-1-4) with diverse topologies, pore morphologies, and sizes and distribution of active sites. Subsequently, we systematically investigated the Friedel-Crafts reactions of 1-methylpyrrole or 1-methylindole with nitroalkene derivatives with diverse sizes to assess the catalytic properties of the above-mentioned URMOFs. These four URMOFs can act as reusable H-bond catalysts and show varied catalytic capacities and size-selectivity properties. Most significantly, the open morphologies of pores, large channels in the framework, and effective distribution of active sites on the wall of the channel are proved to facilitate catalysis. This urea-containing MOF catalytic platform provides new insight into the catalytic properties of MOFs with the same kind of active sites but diverse topologies, pore morphologies, and sizes and distributions of catalytic sites.
Synthesis, crystal structure and gas uptake properties of a urea-functionalized rht-type metal-organic framework
Li, Qiu-Yan,Quan, Ying,Wei, Wei,Li, Jian,Lu, Han,Ni, Rui,Wang, Xiao-Jun
, p. 1 - 6 (2015/07/07)
A hexatopic C3-symmetrical 5,5′,5″-(((benzene-1,3,5-triyltris(azanediyl))tris(carbonyl))tris-(azanediyl))triisophthalic acid (H6-1) linker containing tri-urea groups has been designed and synthesized through the reaction between 1,3,
