کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1402625 | 1501753 | 2014 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis, structural features, and methyl methacrylate polymerisation of binuclear zinc(II) complexes with tetradentate pyrazolyl ligands Synthesis, structural features, and methyl methacrylate polymerisation of binuclear zinc(II) complexes with tetradentate pyrazolyl ligands](/preview/png/1402625.png)
• The bispyrazole-containing binuclear and tetrahedral Zn(II) complexes are synthesized.
• The Zn(II) complexes were active toward polymerization of MMA.
• The activity increased by two-fold compared to the monomeric Zn(II) complex.
The reaction of ZnCl2 with ancillary ligands, including 1,4-bis-(N,N-di-(1H-pyrazolyl-1-methyl)amine)benzene (L1) and 4,4′-bis-(N,N-di(1H-pyrazolyl-1-methyl)phenyl)methane (L2), in ethanol yields Zn(II) chloride complexes, i.e., 1,4-bis-(N,N-di-(1H-pyrazolyl-1-methyl)amine)benzene(dichloro)Zn(II) [L1Zn2Cl4] and 4,4′-bis-(N,N-di-(1H-pyrazolyl-1-methyl)phenyl)methane(dichloro)Zn(II) [L2Zn2Cl4]. The X-ray crystal structures of Zn(II) complexes revealed that they are binuclear, and each zinc atom has a distorted tetrahedral geometry which involves a nitrogen atom from two pyrazole groups and two chloro ligands. The catalytic activity of [L1Zn2Cl4] and [L2Zn2Cl4] for the polymerisation of methyl methacrylate (MMA) in the presence of modified methylaluminoxane (MMAO) increased by twofold compared to the corresponding monomeric Zn(II) complex, N,N-bis(1H-pyrazolyl-1-methyl)aniline(dichloro)Zn(II) [LZnCl2], at 60 °C.
The bispyrazole-containing binuclear and tetrahedral zinc (II) complexes, [L1Zn2Cl4] and [L2Zn2Cl4] have been structurally characterised. The catalytic activity of Zn(II) complexes toward the polymerisation of MMA in the presence of MMAO increased by two-fold compared to the corresponding monomeric Zn(II) complex, [LZnCl2] at 60 °C.Figure optionsDownload as PowerPoint slide
Journal: Journal of Molecular Structure - Volume 1063, 24 April 2014, Pages 70–76