Formation of a Syndiotactic Organic Polymer Inside a MOF by a [2+2] Photo-Polymerization Reaction

Autor:	Caroline Evania Mulijanto, Jagadese J. Vittal, In-Hyeok Park, Raghavender Medishetty, Hyeong-Hwan Lee, Shim Sung Lee, Hong Sheng Quah
Rok vydání:	2015
Předmět:	chemistry.chemical_classification Materials science Ligand fungi General Medicine General Chemistry Polymer Catalysis Cyclobutane chemistry.chemical_compound Photopolymer chemistry Polymerization Yield (chemistry) Tacticity Polymer chemistry Molecule
Zdroj:	Angewandte Chemie International Edition. 54:7313-7317
ISSN:	1433-7851
DOI:	10.1002/anie.201502179
Popis:	Getting suitable crystals for single-crystal X-ray crystallographic analysis still remains an art. Obtaining single crystals of metal-organic frameworks (MOFs) containing organic polymers poses even greater challenges. Here we demonstrate the formation of a syndiotactic organic polymer ligand inside a MOF by quantitative [2+2] photopolymerization reaction in a single-crystal-to-single-crystal manner. The spacer ligands with trans,trans,trans-conformation in the pillared-layer MOF with guest water molecules in the channels, undergo pedal motion to trans,cis,trans-conformation prior to [2+2] photo-cycloaddition reaction and yield single crystals of MOF containing two-dimensional coordination polymers fused with the organic polymer ligands. We also show that the organic polymer in the single crystals can be depolymerized reversibly by cleaving the cyclobutane rings upon heating. These MOFs also show interesting photoluminescent properties and sensing of small organic molecules.
Databáze:	OpenAIRE
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