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Issue 12, 2012
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Preparation of a nitrate-coordinated copper(ii) complex of 2-(pyrazol-3-yl)-6-(pyrazolate)pyridine as an efficient catalyst for methyl methacrylate polymerization

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Abstract

Treatment of [CuCl2(bppyH2)] (1, bppyH2 = 2,6-di(1H-pyrazol-3-yl)pyridine) with 2 equiv. of AgNO3 in DMF gave rise to a binuclear Cu(II) complex [Cu2(bppyH)2(NO3)2] (bppyH = 2-(pyrazol-3-yl)-6-(pyrazolate)pyridine) (2). Complex 2 was characterized by elemental analysis, IR and single crystal X-ray diffraction. Complex 2 has a dimeric structure in which the two Cu(II) centers are bridged by a couple of the in situ-generated bppyH anions. Each Cu(II) center is further coordinated by one O atom of a NO3 anion and three N atoms of one bppyH anion. Complex 2 exhibited a higher catalytic activity in the polymerization of methyl methacrylate (MMA) than the precursor complex 1. Even though the ratio of catalyst to MMA was raised up to 1 : 1500, the PDI for 2 (reaction time was fixed at 4 h) is 1.63 and the conversion is up to 72%. The effects of solvent, reaction temperature and the ratio of MMA to catalyst were also investigated.

Graphical abstract: Preparation of a nitrate-coordinated copper(ii) complex of 2-(pyrazol-3-yl)-6-(pyrazolate)pyridine as an efficient catalyst for methyl methacrylate polymerization

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Supplementary files

Article information


Submitted
09 Nov 2011
Accepted
16 Dec 2011
First published
03 Feb 2012

Dalton Trans., 2012,41, 3424-3430
Article type
Paper

Preparation of a nitrate-coordinated copper(II) complex of 2-(pyrazol-3-yl)-6-(pyrazolate)pyridine as an efficient catalyst for methyl methacrylate polymerization

L. Miao, H. Li, M. Yu, W. Zhao, W. Gong, J. Gao, Z. Ren, H. Wang and J. Lang, Dalton Trans., 2012, 41, 3424 DOI: 10.1039/C2DT12145J

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