SynopsisA polymethacrylate derivative containing uracil bases was methylated by using methyl iodide or dimethyl sulfate to give polymers containing 3-methyluracil derivatives. In the case of methylation with dimethyl sulfate, sulfonation at 5-position of the bases occurred in addition to the methylation at N-3 position. The methylated polymers thus obtained were used further for the study of polymer complex formation with polymethacrylate containing adenine base.
The polyacrylic acid derivative, the copolymer (PABAM) of acrylic acid (AA) and p‐benzoic acid acrylamide (BAM) were prepared by polymeric reaction. The coordinate structure of the polymer–Eu3+ complexes was characterized by X‐ray photoelectron spectroscopy. The fluorescence intensity of the PABAM–Eu3+ complex was enhanced because of introduction of a BAM unit in the polyacrylic acid and reached a maximum when the mole ratio of AA to BAM was about 1 : 1.
The ternary complexes of Eu3+–polymer–1,10‐phenanthroline (PRL), or 2,2‐bipyridine (BPD) were synthesized. The polymers used were PABAM and polyacrylic acid (PAA). The fluorescence intensity of the polymer–Eu3+ complexes was increased by 5∼21 times owing to the introduction of PRL and BPD.
In this work, a unique approach is developed to generate photoswitchable and water-soluble fluorescent nano-aggregates. Initially, a new light-controlled diarylethene-dansyl dyad DAE 1 is formed by linking two dansyl fluorophores covalently to a symmetrical dithienylethene backbone, whose photophysical properties can be reversibly switched by optical stimuli. Subsequently, the water insolubility of the molecular switch 1 is overcome by incorporating it into the bilayer of liposome DPPC (1,2-dihexadecanoyl-sn-glycero-3-phosphocholine) in water. This strategy creates stable fluorescent nano-aggregates OF-1@DPPC (≈25 nm diameter) that are soluble in an aqueous medium. The nano-aggregates OF-1@DPPC retain and even improve the photoswitchable fluorescence properties of DAE 1. More importantly, OF-1@DPPC exhibits a remarkable photostability and fatigue resistance after 5 cycles of irradiation with UV and visible light, which is crucial for its practical application.
SynopsisThis report has mentioned a study that includes preparation of a plyionenzyme complex consisting of quaternized polyvinyl dimethylaminobenzal (QPVDAB), potassium polyacrolein bissulfate (KPABS), and g l u c w oxidase (GOD), and evaluation of relationships between prop erties and structure of the complex are discussed.
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