Chromium Diamino-bis(phenolate) Complexes as Catalysts for the Ring-Opening Copolymerization of Cyclohexene Oxide and Carbon Dioxide

被引：13

作者：

Ambrose, Kenson ^{[1
]}

Murphy, Jennifer N. ^{[1
]}

Kozak, Christopher M. ^{[1
]}

机构：

[1] Mem Univ Newfoundland, Dept Chem, St John, NF A1B 3X7, Canada

来源：

INORGANIC CHEMISTRY | 2020年 / 59卷 / 20期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

TOF MS ANALYSIS; PROPYLENE-OXIDE; AMINO-BIS(PHENOLATE) COMPLEXES; ALTERNATING COPOLYMERIZATION; MECHANISTIC INSIGHT; COUPLING REACTION; SALEN COMPLEXES; CO2; FIXATION; EPOXIDES; BINDING;

D O I：

10.1021/acs.inorgchem.0c02348

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Chromium diamino-bis(phenolate) complexes, CrXL [where L = 6,6'-((1,4-diazepane-1,4-diyl)bis(methylene))bis(2,4-dimethylphenolato) and X = Cl- (1), OH- (2), and N-3(-) (3)], were prepared and characterized by MALDI-TOF MS and single-crystal Xray diffraction. Complex 1 crystallized as two linkage isomers, specifically a green chloride-bridged dimer (1) and a pink asymmetrically bridged isomer exhibiting one chloride bridging atom and one bridging phenolate oxygen (1'). Adventitious moisture during sample handling causes the formation of hydroxide-containing complex 2. The reaction of 1 with PPNN3 (where PPN = bis(triphenylphosphine)iminium) permits the isolation of a crystalline chromium azide complex, 3, which was structurally authenticated. Complex 1 showed good activity toward the ring-opening copolymerization of cyclohexene oxide and carbon dioxide with an added chloride, azide, or 4-(dimethylamino)pyridine (DMAP) cocatalyst to give a completely alternating polycarbonate with a narrow molecular weight dispersity.

引用

页码：15375 / 15383

页数：9

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