83168-90-5Relevant academic research and scientific papers
One - Pot synthesis, characterization, DNA binding and enzymatic studies of 4-methyl trans -cinnamate zinc(II)-mixed ligand complexes
Hafeez, Syeda Tahira,Tahir, Muhammad Nawaz,Ali, Saqib,Iqbal, Muhammad,Gulab, Hussain,Munawar, Khurram Shahzad
, p. 3636 - 3650 (2015)
Four new zinc(II) complexes formulated as [Zn(L)2] (1), [Zn(L)2(phen)] (2), [Zn(L)2(bipy)H2O] (3), and [Zn(en)2(H2O)2](L)2(H2O)2 (4), where HL =
ZnTPPS-Sensitized Photodebromination of 2,3-Dibromo-3-phenylpropionic Acids. Electron Transfer Initiated Chain Debromination
Takagi, Katsuhiko,Miyake, Nobuhisa,Nakamura, Eiichi,Sawaki, Yasuhiko,Koga, Noboru,Iwamura, Hiizu
, p. 1703 - 1708 (2007/10/02)
Photodebromination of 2,3-dibromo-3-phenylpropionic acids (1) sensitized with zinc tetrasodium tetrakis(sulfonatophenyl)porphyrin (ZnTPPS) has been studied in the presence of triethanolamine (TEOA) as a sacrificial reductant.An efficient debromination took place with ZnTPPS, giving cinnamic acids (or their sodium salts) in aqueous or CH3CN solution.Electron-withdrawing substituents on the phenyl ring of the acids promote the debromination, log Φ being correlated with their reduction potentials.A similar free-energy relationship between 1 and excited metallo tetrasodium tetrakis(sulfonatophenyl)porphyrin (MTPPS; M=Sn, Cd, Zn, and H2) implies that the reaction is initiated by a one-electron transfer from the excited ZnTPPS to dibromide.A laser flash photolysis study shows that the excited triplet porphyrin is reductively quenched by 1 with quenching rate constant kq = (6.5 +/- 0.2) * 105 M-1 s-1, giving ZnTPPS+ and 1 -radical anion.A radical chain propagation is involved in the debromination, thus leading to a quantum efficiency higher than unity with higher concentrations of TEOA or 1.
