(Salen)tin complexes:: Syntheses, characterization, crystal structures, and catalytic activity in the formation of propylene carbonate from CO2 and propylene oxide

被引：111

作者：

Jing, HW ^{[1
]}

Edulji, SK ^{[1
]}

Gibbs, JM ^{[1
]}

Stern, CL ^{[1
]}

Zhou, HY ^{[1
]}

Nguyen, ST ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

来源：

INORGANIC CHEMISTRY | 2004年 / 43卷 / 14期

关键词：

D O I：

10.1021/ic034855z

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A series of (salen)tin(II) and (salen)tin(IV) complexes was synthesized. The (salen)tin(IV) complexes, (salen)SnX2 (X = Br and I), were prepared in good yields via the direct oxidation reaction of (salen)tin(II) complexes with Br-2 or I-2. (Salen)SnX2 successfully underwent the anion-exchange reaction with AgOTf (OTf = trifluoromethanesulfonate) to form (salen)Sn(OTf)(2) and (salen)Sn(X)(OTf) (X = Br). The (salen)Sn(OTf)(2) complex was easily converted to any of the dihalide (salen)SnX2 compounds using halide salts. All complexes were fully characterized by H-1 NMR spectroscopy, mass spectrometry, and elemental analysis, while some were characterized by C-13, F-19, and Sn-119 NMR spectroscopy. Several crystal structures of (salen)tin(li) and (salen)tin(IV) were also determined. Finally, both (salen)tin(II) and (salen)tin(IV) complexes were shown to efficiently catalyze the formation of propylene carbonate from propylene oxide and CO2. Of the series, (3,3',5,5'-Br-4-salen)SnBr2, 3i, was found to be the most effective catalyst (TOF = 524 h(-1)).

引用

页码：4315 / 4327

页数：13

共 39 条

[1] Stable heterocyclic (Schiff base) divalent Group 14 element species M-O-Schiff base-O (M = Ge, Sn, Pb) [J].