6333-34-2Relevant articles and documents
Tuning the Reactivity of Cofacial Porphyrin Prisms for Oxygen Reduction Using Modular Building Blocks
Crawley, Matthew R.,Zhang, Daoyang,Oldacre, Amanda N.,Beavers, Christine M.,Friedman, Alan E.,Cook, Timothy R.
supporting information, p. 1098 - 1106 (2021/02/03)
We assembled eight cofacial porphyrin prisms using MTPyP (M = Co(II) or Zn(II), TPyP = 4-tetrapyridylporphyrin) and functionalized ruthenium-based "molecular clips"using coordination-driven self-assembly. Our approach allows for the rapid synthesis of these architectures in isolated yields as high as 98% for the assembly step. Structural and reactivity studies provided a deeper understanding of the role of the building blocks on the oxygen reduction reaction (ORR). Catalytic efficacy was probed by using cyclic and hydrodynamic voltammetry on heterogeneous catalyst inks in aqueous media. The reported prisms showed outstanding selectivity (>98%) for the kinetically hindered 4e-/4H+ reduction of O2 to H2O over the kinetically more accessible 2e-/2H+ reduction to H2O2. Furthermore, we have demonstrated significant cofacial enhancement in the observed catalytic rate constant ks (μ5 orders of magnitude) over the mononuclear analogue. We conclude that the steric bulk of the clip plays an important role in the structural dynamics of these prisms, which in turn modulates the ORR reactivity with respect to selectivity and kinetics.
N,N′-bis(substituted-phenyl)oxamides and their dinuclear pentacoordinate nickel(II) complexes
Santana, M. Dolores,García, Gabriel,Vicente-Hernández, Consuelo,García, Luís,Pérez, José,Rojo, Teófilo,Lezama, Luís
, p. 2009 - 2016 (2008/09/19)
The preparation, spectroscopic characterization and magnetic study of N,N′-bis(substituted-phenyl)oxamidate-bridged nickel(II) dinuclear complexes of formula {[Ni(N3-mc)]2(μ-CONC6H4-X)}(PF6)2/su
Heterocycles from Heterocycles. 1,3-Diaryl-4,5-imidazolidinediones from 1,3,5-Triarylhexahydro-1,3,5-triazines and Oxalyl Chloride
Verardo, Giancarlo,Giumanini, Angelo G.,Gorassini, Fausto,Tolazzi, Marilena,Strazzolini, Paolo
, p. 10609 - 10628 (2007/10/02)
1,3-Diaryl-4,5-imidazolidinediones (6) are easily synthesized from 1,3,5-triarylhexahydro-1,3,5-triazines (1) and oxalyl chloride (5) in a reaction not likely to involve the zwitterionic intermediate (3) of the N-methylenearylamine dimer, but viewing the sequential pick up of two units of the monomer (2) by oxalyl chloride (5).The essential role of ethyl alcohol added to the reaction mixture is recognized.Reaction conditions have been optimized and some ten imidazolidinediones (6) were prepared in good to excellent yields.Geometric parameters of 6 were obtained by X-ray diffraction analysis: all the nuclei are found almost in one plane except for a small twist of the phenyl rings about the C-N bond.