98541-10-7Relevant academic research and scientific papers
Supraphos: A Supramolecular Strategy to Prepare Bidentate Ligands
Slagt, Vincent F.,Roeder, Marc,Kamer, Paul C. J.,Van Leeuwen, Piet W. N. M.,Reek, Joost N. H.
, p. 4056 - 4057 (2004)
We report a new strategy for the preparation of chelating bidentate ligands, which involves just the mixing of two monodentate ligands functionalized with complementary binding sites. In the current example, the assembly process is based on selective metal?ligand interactions, using phosphite zinc(II) porphyrins 1?6 and the nitrogen donor ligands b?i. From only 16 monodentate ligands, a library of 60 palladium catalysts based on 48 bidentate ligand assemblies has been prepared. The relatively small catalyst library gave a large variety in the selectivity of the alkylation of rac-1,3-diphenyl-2-propenyl acetate. Importantly, small variations in the building blocks lead to large differences in the enantioselectivity imposed by the catalyst (up to 97% ee). Copyright
Synthesis and characterization of a binuclear porphyrin complex as a model for heme a3-CuB site of cytochrome c oxidase
Fujii, Hiroshi,Yoshimura, Tetsuhiko,Kamada, Hitoshi
, p. 581 - 582 (1996)
A binuclear complex, 1, involving copper and heme complexes is synthesized and characterized by paramagnetic 1H-NMR, FAB mass, and ESR spectroscopies. These measurements indicate a fairly weak magnetic interaction between iron and copper ions w
Synthesis, characterization and near-infrared photoluminescent studies of diethyl malonate appended mono-porphyrinate lanthanide complexes
He, Hong-Shan,Zhao, Zhi-Xin,Wong, Wai-Kwok,Li, King-Fai,Meng, Jian-Xin,Cheah, Kok-Wai
, p. 980 - 986 (2007/10/03)
A new unsymmetrical diethyl malonate appended porphyrin and its Yb3+, Er3+ and Nd3+ complexes prepared and characterized by elemental analysis, NMR, IR, UV-visible and mass spectral methods. The results revealed that the p
Studies on covalently linked porphyrin-C60 dyads: Stabilization of charge-separated states by axial coordination
D'Souza, Francis,Gadde, Suresh,Zandler, Melvin E.,Arkady, Klykov,El-Khouly, Mohamed E.,Fujitsuka, Mamoru,Ito, Osamu
, p. 12393 - 12404 (2007/10/03)
The effect of axial ligation on the photoinduced charge separation and charge recombination of a series of covalently linked porphyrin-C60 dyads is investigated. Toward this, meso-tetraphenylporphyrin and its zinc(II) derivative are functionali
Intramolecular Electron Transfer in Donor-Acceptor Systems. Porphyrins Bearing Trinitroaryl Acceptor Group
Maiya, G. Bhaskar,Krishnan. V.
, p. 5225 - 5235 (2007/10/02)
Porphyrins bearing picryl group in ortho, meta, and para positions of one of the mesoaryl groups of tetraphenylporphyrin (TPP) have been synthesized in the free-base form.The metal derivatives of the free-base picrylporphyrins (PPc) have been prepared.The broadened Soret absorption, the decreased optical absorbance values of Q bands, and the reduced singlet emission quantun yields of PPc indicate the existence of intramolecular interaction.The extent of this interaction is found to be greater than those observed for the intermolecular systems and varies with the position at which the picryl moiety is attached to the porphyrin as ortho > meta > para.The energies of the redox states, E(CT) of P+Pc-, calculated from the electrochemical redox potentials depend on the nature of the metal ion as free-base PPc > CuPPc > ZnPPc.The nature of intramolecular interaction between the picryl moiety and porphyrin unit is essentially ?-? (CT).Conclusive evidence for light-induced electron transfer in ZnPPc is presented from EPR studies.The decay profiles of the EPR signals vary with the position of the picryl moiety as ortho para meta.Computer simulation of structures substantiated by the 1H NMR results point out the restricted conformational freedom of the picryl moiety in ZnPPc.Arguments based on symmetry considerations of HOMO of the excited singlet state PPc and LUMO of picryl group indicate plane-to-plane orientation of the donor and acceptor in the picrylporphyrins.
