Iron(II) and Zinc(II) Complexes with Tetradentate Bis(pyrazolyl)methane Ligands as Catalysts for the Ring-Opening Polymerisation of rac-Lactide

被引：35

作者：

Herber, Ulrich ^{[1
]}

Hegner, Katharina ^{[1
]}

Wolters, Daniel ^{[1
]}

Siris, Rita ^{[2
]}

Wrobel, Karina

Hoffmann, Alexander ^{[1
]}

Lochenie, Charles ^{[1
,3
]}

Weber, Birgit ^{[3
]}

Kuckling, Dirk ^{[4
]}

Herres-Pawlis, Sonja ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Inorgan Chem, Landoltweg 1, D-52074 Aachen, Germany

[2] Ludwig Maximilians Univ Munchen, Dept Chem & Pharm, Butenandtstr 5-13, D-81377 Munich, Germany

[3] Univ Bayreuth, Inorgan Chem 2, Univ Str 30, D-95440 Bayreuth, Germany

[4] Univ Paderborn, Dept Chem, Warburger Str 100, D-33098 Paderborn, Germany

来源：

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2017年 / 10期

关键词：

N ligands; Iron; Zinc; Ring-opening polymerization; TRANSITION-METAL-COMPLEXES; N; O HETEROSCORPIONATE LIGANDS; DIFFERENT DONOR ABILITIES; PYRIDINE HYBRID LIGANDS; CYCLIC ESTERS; SPECTROSCOPIC PROPERTIES; SCORPIONATE LIGANDS; RUTHENIUM CARBENE; FERRIC ALKOXIDES; POLYLACTONES;

D O I：

10.1002/ejic.201601345

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A new subgroup of bis(pyrazolyl) methane ligands has been developed through the synthesis of the first N, N, N, N-tetradentate bis(pyrazolyl) methane compounds, namely, bis( pyrazolyl) bipyridinylmethane [HC(Pz)(2)Bipy, L1] and bis(3,5methylpyrazolyl) bipyridinylmethane [HC(3,5-MePz)(2)Bipy, L2]. From these ligands, a large variety of new mononuclear Fe-II and Zn-II complexes with counterions ranging from halides to carboxylates and sulfate were synthesised and characterised by X-ray crystallography. The complexes [Fe{HC(Pz)(2)Bipy}X-2] (X = Cl-, CF3CO2-, CF3 SO3-), [Fe{HC(3,5-MePz)(2)Bipy}X-2] (X = Cl-, CF3CO2-) and [Zn{HC(Pz)(2)Bipy}X-2] (X = Cl-, CF3CO2-) were tested in the melt ring-opening polymerisation of sublimed and unsublimed technical-grade rac-lactide at 150 degrees C. The complex [Fe{HC(Pz)(2)Bipy}(CF3CO2)(2)(-)] showed the most promising results and produced a conversion of 87 % after 30 h with molecular weights of M-w approximate to 30000 g mol(-1).

引用

页码：1341 / 1354

页数：14

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