scholarly journals Uranyl dication mediated photoswitching of a calix[4]pyrrole-based metal coordination cage

2018 ◽  
Vol 54 (68) ◽  
pp. 9422-9425 ◽  
Author(s):  
Juhoon Lee ◽  
James T. Brewster ◽  
Bo Song ◽  
Vincent M. Lynch ◽  
Inhong Hwang ◽  
...  
Keyword(s):  
Metal Coordination ◽  
Self Assembled

A set of self-assembled tri- and tetrapodal metal coordination cage structures (cage-1 and cage-2, respectively) constructed from the uranyl dication (UO22+) and a dibenzoic acid functionalised cis-calix[4]pyrrole (1) are described.

Self-Assembled Squares and Triangles by Simultaneous Hydrogen Bonding and Metal Coordination

2013 ◽  
Vol 15 (7) ◽  
pp. 1548-1551 ◽  
Author(s):  
Laura J. Marshall ◽  
Javier de Mendoza
Keyword(s):  
Hydrogen Bonding ◽  
Metal Coordination ◽  
Self Assembled

Recent Progress of Synergistic Supramolecular Polymers: Preparation, Properties and Applications

2020 ◽  
Author(s):  
Yufeng Huo ◽  
Zhenfeng He ◽  
Chao Wang ◽  
Lei Zhang ◽  
Qianyu Xuan ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Recent Progress ◽  
Noncovalent Interactions ◽  
The Self ◽  
Metal Coordination ◽  
Supramolecular Polymers ◽  
Π Stacking ◽  
Self Assembled

Supramolecular polymers combine the properties of traditional polymers and supramolecules. They are normally formed by the self-assembled polymerization driven via noncovalent interactions (such as hydrogen bonding, π-π stacking, metal coordination,...

scholarly journals A two-fold approach towards understanding properties of two self-assembled macrocycles: resorcin[4]arene and pyrogallol[4]arene

2015 ◽  
Author(s):  
◽  
Amanda M. Drachnik
Keyword(s):  
Functional Group ◽  
Electronic Structure Calculations ◽  
Industrial Applications ◽  
Molecular Magnetism ◽  
Metal Coordination ◽  
Metal Organic ◽  
Self Assembled ◽  
Synthetic Work ◽  
Structure Calculations

Self-assembled macrocycles, molecular entities that are connected together spontaneously in a cyclic manner, are studied herein. Pyrogallol[4]arene (PgC) and resorcin[4]arene (RsC), self-assembled macrocycles made from four units of pyrogallol and four units of resorcinol, respectively, are be the main focus of this work. The first two topics discussed are metal-coordination of PgC and RsC. PgC forms both dimeric and hexameric metal-organic nanocapsules (MONCs); however, these types of architectures have not yet been observed for RsC. In our attempt to create analogous MONCs involving RsC, manganese and cobalt complexes were encapsulated inside a hydrogen-bonded dimeric capsule of RsC. The investigation into metal-coordinated PgC MONCs led to additional metal-coordination on the exterior of the MONCs, thus creating metal-organic frameworks using MONCs. Both of these systems have potential in the applications of molecular magnetism, gas sorption/separation, and encapsulation of other molecules. PgC and RsC also may be used to encapsulate pharmaceuticals, e.g. Humalog and gabapentin. In this work, cocrystallization of RsC with pregabalin, a pharmaceutical similar to gabapentin in both structure (GABA functional group) and usage, was attempted. Unexpectantly, pregabalin underwent a cyclization to 4-isobutylpyrrolidone-2, a compound known in polymer synthesis. Both pregabalin and 4- isobutylpyrrolidone-2 are linked to important industrial applications. The final chapter discusses the study of the various stereoisomers of RsCs by means of electronic structure calculations, in both the gas and solution phase. Stereoisomers are structures of a molecule for which the atoms are orientated differently in space but the molecule retains its identity. It was found from these calculations that the cone conformer, where the hydroxyl-substituted side (top) of all four resorcinol subunits point up, is most stable when the tail group of the macrocycle is a hydrogen. The chair stereoisomer, where top of one subunit points up, the top of the opposite subunit points down, and tops of the remaining two subunits lie in the plane, is most stable when the tail group of the macrocycle is a phenyl. These studies are of importance to the synthetic work on this macrocycle, which affects all further studies on the macrocycle.

Synthesis and structural characterization of a new self-assembled disulfide linked meso-tetrakis-porphyrin macromolecular array

2008 ◽  
Vol 12 (07) ◽  
pp. 845-848 ◽  
Author(s):  
Abilio J. F. N. Sobral ◽  
Licinia L. G. Justino ◽  
Ana C. C. Santos ◽  
Joana A. Silva ◽  
Cláudia T. Arranja ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Structural Characterization ◽  
Disulfide Bonds ◽  
Metal Coordination ◽  
Intermolecular Hydrogen Bonds ◽  
Coordination Bonding ◽  
Self Assembled

The synthesis of a new self-assembled porphyrin macrostructure based on disulfide bonds, is presented. This constitutes a new way to directly connect porphyrins in macromolecular arrays, to complement the usual methods of intermolecular hydrogen bonds and metal coordination bonding.

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