1175639-75-4Relevant academic research and scientific papers
Cadmium(II) complexes containing N′-substituted N,N-di(2-picolyl)amine: The formation of monomeric versus dimeric complexes is affected by the N′-substitution group on the amine moiety
Song, Yujin,Nayab, Saira,Jeon, Jongho,Park, Sang Hyun,Lee, Hyosun
, p. 55 - 63 (2015)
The reaction of [CdBr2·4H2O] with N′-substituted N,N-di(2-picolyl)amine ligands such as 1-cyclohexyl-N,N-bis(pyridin-2-ylmethyl)methanamine (LA), N,N-bis(pyridin-2-ylmethyl)aniline (LB), 2-methoxy-N,N-bis(pyridin-2-ylmethyl)ethan-1-amine (LC) and 3-methoxy-N,N-bis(pyridin-2-ylmethyl)propan-1-amine (LD) in ethanol yielded cadmium(II) [Cd(II)] complexes, i.e. [LnCdBr2]m (Ln = LA, m = 2; LB, m = 1; LC, m = 1; LD, m = 2, respectively). The molecular structures of Cd(II) complexes revealed that 6-coordinate dimeric [LACd(μ-Br)Br]2 and [LDCd(μ-Br)Br]2 showed a distorted octahedral geometry through coordination of nitrogen in the N′-substituted amine moiety (cyclohexylmethylamine and 3-methoxypropylamine, respectively) to the Cd metal centre and a bromide bridge ligand. However, the 5-coordinate monomeric [LBCdBr2] was square pyramidal through the coordination of nitrogen in the N′-phenyl-substituted amine residue to the Cd metal centre. The molecular structure of 6-coordinate monomeric [LCCdBr2] had a distorted octahedral geometry achieved through bidentate coordination of nitrogen and oxygen in the N′-methoxyethylamine group to the Cd metal centre. However, for dimeric [LDCd(μ-Br)Br]2, although LD has a bidentate coordination ability in the N′-methoxypropylamine group, it generated a distorted octahedral geometry through coordination of nitrogen and non-coordination of oxygen in the N′-methoxyethylamine moiety to the Cd metal centre. Monomeric complex [LBCdBr2] [6.70 × 104 gPMMA·(molCd·h)-1] showed higher catalytic activity for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) than the rest of Cd(II) complexes in this study. The catalytic activity of dimeric complex [LACd(μ-Br)Br]2 [7.00 × 104 gPMMA·(molCd·h)-1] and [LDCd(μ-Br)Br]2 [7.07 × 104 gPMMA·(molCd·h)-1] increased by twofold due to the presence of two Cd metal centres compared to the corresponding reference complex [CdBr2·4H2O] [2.85 × 104 gPMMA·(molCd·h)-1] or anhydrous [CdCl2] [3.53 × 104 gPMMA·(molCd·h)-1]. All Cd(II) complexes resulted in syndiotactic poly(methylmethacrylate) (PMMA) with ca. 0.70.
Novel Cobalt(II) complexes containing N,N-di(2-picolyl)amine based ligands; Synthesis, characterization and application towards methyl methacrylate polymerisation
Ahn, Seoung Hyun,Choi, Sang-Il,Jung, Maeng Joon,Nayab, Saira,Lee, Hyosun
, p. 24 - 31 (2016/02/23)
The reaction of [CoCl2·6H2O] with N′-substituted N,N-di(2-picolyl)amine ligands such as 1-cyclohexyl-N,N-bis(pyridin-2-ylmethyl)methanamine (LA), 2-methoxy-N,N-bis(pyridin-2-ylmethyl)ethan-1-amine (LB), and 3-methoxy-N,N-bis(pyridin-2-ylmethyl)propan-1-amine (LC), yielded [LnCoCl2] (Ln = LA, LB and LC), respectively. The Co(II) centre in [LnCoCl2] (Ln = LA, and LC) adopted distorted bipyramidal geometries through coordination of nitrogen atoms of di(2-picolyl)amine moiety to the Co(II) centre along with two chloro ligands. The 6-coordinated [LBCoCl2] showed a distorted octahedral geometry, achieved through coordination of the two pyridyl units, two chloro units, and bidentate coordination of nitrogen and oxygen in the N′-methoxyethylamine to the Co(II) centre. [LCCoCl2] (6.70 × 104 gPMMA/molCo h) exhibited higher catalytic activity for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) compared to rest of Co(II) complexes. The catalytic activity was considered as a function of steric properties of ligand architecture and increased steric bulk around the metal centre resulted in the decrease catalytic activity. All Co(II) initiators yielded syndiotactic poly(methylmethacrylate) (PMMA).
Synthesis and structural characterisation of Palladium(ii) complexes with N,N′,N-tridentate N′-substituted N,N-Di(2-picolyl)amines and their application to methyl methacrylate polymerisation
Kim, Sunghoon,Kim, Dongil,Song, Yujin,Lee, Ha-Jin,Lee, Hyosun
, p. 953 - 961 (2014/07/07)
The reaction of [Pd(CH3CN)2Cl2] with N′-substituted N,N-di(2-picolyl)amine-based ancillary ligands, for example N,N-di(2-picolyl)cyclohexylmethylamine (L1), N,N-di(2-picolyl)benzylamine (L2), N,N-di(2-picolyl)aniline (L3), and 1,4-bis[bis(2-pyridylmethyl)aminomethyl] benzene (L4), in the presence of NaClO4 in ethanol yields a new series of [(NN′N)PdCl]X (X≤ClO4, Cl) complexes, i.e. mononuclear [LnPdCl]ClO4 (Ln≤L1, L2, L 3) and binuclear [L4Pd2Cl2]Cl 2. X-Ray crystallographic analysis determined that the Pd atom in complexes [(NN′N)PdCl]X showed a slightly distorted square-planar geometry involving three nitrogen atoms and a chlorido ligand. Moreover, the unit cell included a ClO4-or Cl-anion as the counterion. The complex [L1PdCl]ClO4 showed the highest catalytic activity for the polymerisation of methyl methacrylate in the presence of modified methylaluminoxane at 60°C among the mononuclear PdII complexes. Specifically, the activity of binuclear [L4Pd2Cl 2]Cl2 was 2-fold higher than the corresponding mononuclear [L2PdCl]ClO4 per active palladium metal centre. CSIRO 2014.
