284497-48-9Relevant articles and documents
Complexation of N4-tetradentate ligands with Nd(III) and Am(III)
Ogden, Mark D.,Sinkov, Serguei I.,Meier, G. Patrick,Lumetta, Gregg J.,Nash, Kenneth L.
, p. 2138 - 2153 (2012)
To improve understanding of aza-complexants in trivalent actinide-lanthanide separations, a series of tetradentate N-donor ligands have been synthesized and their complexation of americium(III) and neodymium(III) investigated by UV-visible spectrophotometry in methanolic solutions. The six pyridine/alkyl amine/imine ligands are N,N′-bis(2-methylpyridyl)-1,2- diaminoethane, N,N′-bis(2-methylpyridyl)-1,3-diaminopropane, trans-N,N-bis(2-pyridylmethyl)-1,2-diaminocyclohexane (BPMDAC), N,N'-bis(2-pyridylmethyl)piperazine, N,N'-bis-[pyridin-2-ylmethylene]ethane-1,2- diamine, and trans-N,N-bis-([pyridin-2-ylmethylene]-cyclohexane-1,2-diamine. Each ligand has two pyridine groups and two aliphatic amine/imine N-donor atoms arranged with different degrees of preorganization and structural backbone rigidity. Conditional stability constants for the complexes of Am(III) and Nd(III) by these ligands establish the selectivity patterns. The overall selectivity of Am(III) over Nd(III) is similar to that reported for the terdentate bis(dialkyltriazinyl)pyridine molecules. The cyclohexane amine derivative (BPMDAC) is the strongest complexant and shows the highest selectivity for Am(III) over Nd(III) while the imines appear to prefer a bridging arrangement between two cations. These results suggest that this series of ligands could be employed to develop an enhanced actinide(III)- lanthanide(III) separation system.
From Mesocates to Helicates: Structural, Magnetic and Chiro-Optical Studies on Nickel(II) Supramolecular Assemblies Derived from Tetradentate Schiff Bases
Mayans, Júlia,Font-Bardia, Mercè,Di Bari, Lorenzo,Arrico, Lorenzo,Zinna, Francesco,Pescitelli, Gennaro,Escuer, Albert
, p. 7653 - 7663 (2018)
The systematic reactions of a family of tetradentate pyridyl/imine and quinolyl/imine racemic or enantiopure Schiff bases with Ni(NO3)2 or Ni(ClO4)2 in the presence of sodium azide yielded, as a function of the
Rhodium(I) bisaldimine complexes in transfer hydrogenation
Nindakova,Badyrova,Sadykov, E. Kh.,Ushakov,Vanzarakshaeva, S. Ch.
, p. 2537 - 2545 (2017)
The reactions of hydrogen transfer from 2-propanol on acetophenone in the presence of the system [Rh(cod)Cl]2–L] (L is bisaldimine ligands based on (R,R)-1,2-cyclohexanediimine and pyridine-, quinoline-, and thiophenecarboxaldehyde) were studie
Catalytic oxidation of alcohols with novel non-heme N4-tetradentate manganese(ii) complexes
Vermaak, Vincent,Young, Desmond A.,Swarts, Andrew J.
supporting information, p. 16534 - 16542 (2018/12/05)
We report the preparation and characterisation of a series of novel non-heme N4-tetradentate Mn(OTf)2 complexes of the type, [(L)MnOTf2], where L = R,R and S,S enantiomers of BPMCN, its 6-methyl and 6-bromo derivatives as well as the novel ligand BMIMCN (BPMCN = N,N′-dimethyl-N,N′-bis(2-pyridylmethyl)-(R,R/S,S)-1,2-diaminocyclohexane, BMIMCN = N,N′-dimethyl-N,N′-bis(1-methyl-2-imidazolemethyl)-(R,R/S,S)-1,2-diaminocyclohexane). Solid state structural analysis of the BMIMCN-ligated Mn-triflate complexes (R,R-C4 and S,S-C4) revealed opposite helicity but identical metal site accessibility. This feature was exploited in the catalytic oxidation of primary and secondary alcohols, with hydrogen peroxide as oxidant and acetic acid as co-catalyst. Complexes R,R-C4 and S,S-C4 displayed the highest activity in benzyl alcohol oxidation, attributed to the electron-donating property of the BMIMCN ligand. Complex S,S-C4, displayed high activity for a variety of primary alcohol substrates, but the reaction suffered from reduced selectivity and side-reactions due to the presence of acetic acid. In contrast, secondary alcohol substrates could be oxidised to the corresponding ketone products in excellent isolated yields under mild reaction conditions and short reaction times.
