960286-62-8Relevant academic research and scientific papers
Synthesis and characterisation of palladium(II) and platinum(II) complexes with N,N′,N-tridentate ligands based on N, N-di(2-picolyl) cycloalkylamine and polymerisation of methyl methacrylate
Kim, Dongil,Kim, Sunghoon,Kim, Eunhee,Lee, Ha-Jin,Lee, Hyosun
, p. 139 - 146 (2013)
The reaction of Pd(CH3CN)2Cl2 and NaClO4 with the ancillary ligands N, N-di(2-picolyl)cyclopentylamine (L1), N, N-di(2-picolyl)cyclohexylamine (L2) and N, N-di(2-picolyl) cycloheptylamine (L3) in ethanol yielded a new series of [(N,N′,N)-PdCl]ClO4 complexes, i.e., [PdL1]ClO 4, [PdL2]ClO4 and [PdL3]ClO 4, respectively. The reaction of Pt(CH3CN) 2Cl2 and NaClO4 with the ancillary ligands L1-L3 gave only the stable [PtL2]ClO4 complex. The Pd and Pt atoms of all of the complexes had an almost square-planar geometry involving three nitrogen atoms and a chloro ligand. Moreover, the unit cell included a ClO4 anion as the counterion. The bond lengths between the metal and nitrogen atoms are a little affected by the substituted cycloalkyl group, however those between the metal and the chloro ligand are not affected. The catalytic activity of the Pd(II) and Pt(II) complexes toward the polymerisation of methyl methacrylate in the presence of modified methylaluminoxane resulted in a high molecular weight and a narrow polydispersity index; the highest activity was measured for [PdL3]ClO4 at 60 °C.
Synthesis of Co(II) NNN-pyridine based complexes and their activity in the partial oxidation of n-octane
Chanerika, Revana,Friedrich, Holger B.,Shozi, Mzamo L.
, (2019/07/12)
A series of four NNN-pyridine based ligands of the general form: pyCH2N(R)CH2py {R = propyl, tert-butyl, cyclohexyl and phenyl; py = pyridine} were synthesised and characterised. Complexation of each ligand to CoCl2?6H2O afforded new Co(II) complexes [Co{pyCH2N(R)CH2py}Cl2] (R = C3H7 (1), C(CH3)3 (2), C6H11 (3) and C6H5 (4)). Single crystal X-ray diffraction data confirmed that complex 1 crystallised as a mononuclear unit and was characterised by a distorted trigonal bipyramidal arrangement of ligands around Co. As catalysts in the oxidation of n-octane using t-BuOOH as oxidant, 2 (10% product yield) was found to be most efficient and the selectivity over 1–4 was predominantly towards 2-octanol, after reduction of alkylhydroperoxides by PPh3. All catalysts were significantly more active in the activation of n-octane using hydrogen peroxide, with a yield of 45% observed over catalyst 3. Furthermore, with H2O2, all catalysts produced a high concentration of alkylhydroperoxides, with catalyst 4 giving up to 91% alcohols after workup. TONs of up to 1100 were achieved over the Co/H2O2 systems.
Synthesis and structural characterization of [(dpca)MX2] (M = Cu, X = Cl; M = Cd, X = Br and M = Zn, X = NO3) complexes containing N,N-di(2-picolyl)cyclohexylamine (dpca) and their application to methyl methacrylate polymerization
Song, Yujin,Kim, Dongil,Lee, Ha-Jin,Lee, Hyosun
, p. 66 - 70 (2014/05/20)
A novel series of [(dpca)MX2] (M = Cu, X = Cl; M = Cd, X = Br and M = Zn, X = NO3) complexes were synthesized through the reaction of N,N-di(2-picolyl)cyclohexylamine (dpca) with the corresponding metal starting materials. X-ray crystallographic analysis determined that the metal center in complexes [(dpca)CuCl2], [(dpca)CdBr2] and [(dpca)Zn(NO3)2] showed a distorted 5-coordinated square pyramidal, trigonal bipyramidal, and 7-coordinated pentagonal bipyramidal geometry, respectively, involving coordination of the nitrogen atom of the cyclohexylamine moiety with the metal center. Specifically, the catalytic activity of [(dpca)Zn(NO3)2] (1.04 × 105 g PMMA/mol Zn·h) for the polymerization of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) at 60 °C was six-fold higher than the reference complex [ZnCl2] (1.73 × 10 4 g PMMA/mol Zn·h).
