Characterization of the Local Volume Probed by the Side-Chain Ends of Poly(oligo(ethylene glycol) 1-Pyrenemethyl ether methacrylate) Bottle Brushes in Solution Using Pyrene Excimer Fluorescence was written by Thoma, Janine L.;Duhamel, Jean. And the article was included in Macromolecules (Washington, DC, United States) in 2021.Recommanded Product: 111-77-3 This article mentions the following:
Four poly(oligo(ethylene glycol) 1-pyrenemethyl ether methacrylate) [P(PyEGyMA), with y = 3, 5, 8, and 12] samples were synthesized, where each side chain was terminated with a 1-pyrenemethoxy derivative The efficiency of excimer formation between an excited-state pyrene and a ground-state pyrene was used to assess the conformation of the PyEGy side chains in these polymeric bottle brushes by conducting time-resolved fluorescence measurements in THF (THF), N,N-dimethylformamide (DMF), dioxane, and dimethylsulfoxide (DMSO). These experiments took advantage of the dependency of the average rate constant ãkã?of pyrene excimer formation (PEF) on the local pyrene concentration [Py]loc experienced by an excited pyrene bound to the P(PyEGyMA) samples. [Py]loc could be estimated theor. by assuming that the EGy side chains adopted a Gaussian conformation. Linear plots of ãkã?fdiff as a function of [Py]loc, where fdiff is the molar fraction of pyrenyl labels forming excimers by diffusion and was introduced to account for residual pyrene aggregation, were obtained in all four solvents, with slopes that depended on solvent viscosity and the probability of PEF upon the diffusive encounter between two pyrenyl labels. Solvent-induced differences in PEF efficiency could be accounted for by determining the bimol. rate constant kdiff[inter] for intermol. PEF with the model compound 1-pyrenemethyl diethylene glycol Me ether in the four solvents. Except for DMSO, which was too polar and led to the segregation of the pyrenyl labels close to the polymethacrylate backbone, the data obtained for all P(PyEGyMA) samples in THF, DMF, and dioxane collapsed on a master line, similar to the one obtained earlier with a series of pyrene-labeled dendrons, when plotting ãkã?(fdiff x kdiff[inter])-vs-[Py]loc. The ãkã?(fdiff x kdiff[inter])-vs-[Py]loc master line confirmed the direct relationship that exists between the PEF efficiency and [Py]loc, a relationship that could be used to probe the conformation of highly branched macromols. in solution In the experiment, the researchers used many compounds, for example, 2-(2-Methoxyethoxy)ethanol (cas: 111-77-3Recommanded Product: 111-77-3).
2-(2-Methoxyethoxy)ethanol (cas: 111-77-3) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. Ethers can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds. The ability to form hydrogen bonds with other compounds makes ethers particularly good solvents for a wide variety of organic compounds and a surprisingly large number of inorganic compounds.Recommanded Product: 111-77-3
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem