Palladium(II) complexes containing N,N′-bidentate N-cycloalkyl 2-iminomethylpyridine and 2-iminomethylquinoline: Synthesis, characterisation and methyl methacrylate polymerisation
摘要:
The reaction of [Pd(CH3CN)(2)Cl-2] with N-cyclopentyl-1-(pyridin-2-yl)methanimine (L-1), N-cyclohexyl-1-(pyridin-2-yl)methanimine (L-2), N-(piperidin-1-yl)-1-(pyridin-2-yl)methanimine (L-3) or N-cyclopentyl-1-(quinolin-2-yl)methanimine (L-4) in ethanol yields the bidentate (NN') PdCl2 complexes [L1PdCl2], [L2PdCl2], [L3PdCl2] and [L4PdCl2), respectively. The X-ray crystal structure of the Pd(II) complexes revealed that the Pd atom in [LnPdCl2] (L-n = L-1, L-2, L-3, L-4) shows a distorted square planar geometry involving two nitrogen atoms and two chloro ligands. The complexes [L1PdCl2] and [L4PdCl2] (of which the ligands are N-cyclopentyl substituted) showed the highest catalytic activity for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) with an activity of 1.45 x 10(5) g PMMA/mol Pd h at 60 degrees C and a PMMA syndiotacticity (characterized using C-13 NMR spectroscopy) of ca. 0.70. (C) 2013 Elsevier Ltd. All rights reserved.
Synthesis, characterization and antimicrobial properties of lipophilic palladium complexes bearing iminopyridine ligands
作者:Patrick T. Gormley、B. Ninh Khuong、Courtney M. Dickie、Ashley M. Taweel、Heather L. Blundon、Josée-Marie E. J. Melanson、Adam F. LeBlanc、Tara S. Murphy、Curran G. Tompkins、Christopher M. Vogels、Andreas Decken、Felix J. Baerlocher、Tyson J. MacCormack、Stephen A. Westcott
DOI:10.1007/s11243-015-9977-3
日期:2015.11
The reaction of [PdCl2(η2-coe)]2 (coe = cis-cyclooctene) with nine lipophilic iminopyridine ligands (NN′, 1a–i) afforded the corresponding metal complexes cis-[PdCl2(NN′)] (2a–i) with concomitant loss of the labile coe ligands. All iminopyridine complexes were characterized by physicochemical and spectroscopic methods. The molecularstructures of two complexes, 2a and 2b, were determined by single