Unknown

Dataset Information

0

Molecular recognition and self-assembly special feature: Supramolecular polymer formed by reversible self-assembly of tetrakisporphyrin.


ABSTRACT: S-shaped tetrakisporphyrin 2 forms supramolecular polymeric assemblies via a complementary affinity of its bisporphyrin units in solution. The self-association constant determined by applying the isodesmic model is >10(6) L mol(-1), which suggests that a sizable polymer forms at millimolar concentrations at room temperature. The electron deficient aromatic guest (TNF) binds within the molecular clefts provided by the bisporphyrin units via a charge-transfer interaction. This guest complexation completely disrupts supramolecular polymeric assembly. The long, fibrous fragments of the polymeric assemblies were characterized by atomic-force microscopy imaging of a film cast on a mica surface. The polymeric assemblies have lengths of >1mum and show a coiled structure with a higher level of organization. The approach discussed in this report concerning the quick preparation of supramolecular polymeric assemblies driven by noncovalent forces sets the stage for the preparation of a previously undescribed class of macromolecular porphyrin architectures.

SUBMITTER: Haino T 

PROVIDER: S-EPMC2705564 | biostudies-other | 2009 Jun

REPOSITORIES: biostudies-other

altmetric image

Publications

Molecular recognition and self-assembly special feature: Supramolecular polymer formed by reversible self-assembly of tetrakisporphyrin.

Haino Takeharu T   Fujii Takashi T   Watanabe Akihide A   Takayanagi Urara U  

Proceedings of the National Academy of Sciences of the United States of America 20090316 26


S-shaped tetrakisporphyrin 2 forms supramolecular polymeric assemblies via a complementary affinity of its bisporphyrin units in solution. The self-association constant determined by applying the isodesmic model is >10(6) L mol(-1), which suggests that a sizable polymer forms at millimolar concentrations at room temperature. The electron deficient aromatic guest (TNF) binds within the molecular clefts provided by the bisporphyrin units via a charge-transfer interaction. This guest complexation c  ...[more]

Similar Datasets

| S-EPMC2705560 | biostudies-literature
| S-EPMC2705539 | biostudies-literature
| S-EPMC2705591 | biostudies-other
| S-EPMC2705570 | biostudies-literature
| S-EPMC2705605 | biostudies-literature
| S-EPMC2705522 | biostudies-literature
| S-EPMC2705525 | biostudies-literature
| S-EPMC2705589 | biostudies-literature
| S-EPMC2705529 | biostudies-literature
| S-EPMC2705557 | biostudies-literature