Photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was achieved in poly(ethylene glycol)-400 with nanosized a-Fe 2 O 3 as photoinitiator. Well-defined poly(methyl methacrylate) (PMMA) was synthesized in conjunction with ethyl 2-bromoisobutyrate (EBiB) as ATRP initiator and FeCl 3 Á6H 2 O/Triphenylphosphine (PPh 3 ) as complex catalyst. The photo-induced polymerization of MMA proceeded in a controlled/living fashion. The polymerization followed first-order kinetics. The obtained PMMA had moderately controlled number-average molecular weights in accordance with the theoretical number-average molecular weights, as well as narrow molecular weight distributions (M w /M n ). In addition, the polymerization could be well controlled by periodic light-on-off processes. The resulting PMMA was characterized by 1 H nuclear magnetic resonance and gel permeation chromatography. The brominated PMMA was used further as macroinitiator in the chain-extension with MMA to verify the living nature of photo-induced ATRP of MMA.

The photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) was successfully carried out in ionic liquid at ambient temperature with ethyl 2-bromoisobutyrate as initiator and CuBr 2 /N,N,N′,N′,N″-pentamethyldiethylenetriamine as the complex catalyst system. In this system, TiO 2 was used as photocatalyst. The well-controlled poly(methyl methacrylate) (PMMA) was obtained, as evidenced by the controlled molecular weights of the obtained. The prepared PMMA had narrow molecular weight distributions. The polymerizations were manipulated by turning on/off the light. The chemical structure of the obtained PMMA was characterized by 1 H NMR. Chain extension experiment with bromine-atom-ended PMMA as macroinitiator was carried out successfully to verify the living nature of photo-induced ATRP of MMA.Keywords Living polymerization . Atom transfer radical polymerization . MMA . Ionic liquid . Light Since its introduction in 1995 [1], atom transfer radical polymerization (ATRP) has received a great deal of attention in the field of polymer chemistry, due to its mild conditions, its applicability to a large variety of vinyl monomers, and its excellent control over the polymer structure. A dynamic equilibrium is established in ATRP by a reversible redox process between an alkyl halide initiator and different transition metals with different ligands. By now, ATRP has been carried out in some green solvents, for example, water [2], ionic liquid [3], supercritical CO 2 [4]. As a green solvent, ionic liquid replaced some organic solvent as mediums. The major benefits of using ionic liquid are chemical and thermal stability, non-flammability and immeasurably low vapor pressure. Furthermore, ionic liquid was easy to handle and reused [5]. ATRP of MMA in ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]-[PF 6 ]) was investigated by Haddleton and coworkers [6]. The polymerization rate was accelerated and the catalyst was dissolved in ionic liquid and isolated from the obtained polymers. Our group has reported Fe-mediated AGET ATRP of n-butyl acrylate in ionic liquid [7], ICAR ATRP of methyl methacrylate in ionic liquid microemulsions [8], and controlled/living copolymerization of styrene and acrylonitrile in ionic liquid microemulsions [9]. In these studies, Fe catalyst was proved to be an active catalyst. Recently, photoinduced living polymerizations have been attracted much attention in various solvents, which utilizes light energy to initiate chain reactions. Many reports on photo-induced living polymerization have been reported [10][11][12][13][14][15]. In the light of the preliminary of Guan et al. [16], it was found that the amount of catalyst and the energy cost can be decreased.Iron catalysts have been applied in ATRP due to its low cost, low toxicity, and good biocompatibility. Many excellent works about Fe-mediated ATRP have been widely investigated [17][18][19][20]. However, there has been very little research reported on photo-induced Fe-mediated ATRP. Our group has reported...

CuC 24 H 16 N 2 O4, monoclinic, C2/c (no. 15), a = 20.262(7) Å, CCDC no.: 1453443The crystal structure is shown in the gure. Tables 1-3 contain details of the measurement method and a list of the atoms including atomic coordinates and displacement parameters.

C 13 H 9 Cl 2 N, monoclinic, P21/c (no. 14), a = 3.9518 (18) CCDC no.: 1452241The crystal structure is shown in the gure. Tables 1-3 contain details of the measurement method and a list of the atoms including atomic coordinates and displacement parameters. Source of materialThe title compound was synthesized by the reaction of 4-chloro-phenylamine (1 mmol, 127.6 mg) with 2-chlorobenzaldehyde (1 mmol, 140.6 mg) in ethanol (20 mL) under re ux (348 K) for 6 h. The solvent was removed and the solid product was washed with diethyl ether. Colorless blockshaped single crystals with approx. size 0.20 × 0.12 × 0.10 mm were obtained by slow evaporation of a dichloromethane solution at room temperature. Experimental detailsAll H atoms were placed in idealized positions, re ned with distance restraints of C-H = 0.93 Å and re ned as riding atoms with U iso (H) = 1.2 Ueq(C). DiscussionSchi -bases have been of great interest for many years because of their wide application in metal coordination chemistry as important classes of ligands and higher bioactivity [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In order to search for new Schi -bases, the title compound was synthesized and its crystal structure determined. The two aromatic rings form dihedral angles of 5.50(1)°. The C7 = N1 bond length of 1.241(6) Å showing its doublebond character. The C7 = N1-C8 angle is 121.6(4)°.The arene moieties are stacked along the a direction with a face-to-face distance of 3.952 Å.