First stable nitrate-encapsulated sandwich type polyoxometalate: Synthesis, structural characterization, and catalytic performance

被引：11

作者：

Farsani, Mostafa Riahi ^{[1
]}

Yadollahi, Bahram ^{[1
]}

Rudbari, Hadi Amiri ^{[1
]}

Amini, Akbar ^{[1
]}

Caradoc-Davis, Tom ^{[2
]}

Price, Jason R. ^{[2
]}

机构：

[1] Univ Isfahan, Dept Chem, Esfahan 8174673441, Iran

[2] Australian Synchrotron, Clayton, Vic 3168, Australia

来源：

INORGANIC CHEMISTRY COMMUNICATIONS | 2014年 / 43卷

关键词：

Sandwich type polyoxometalates; Nitrate-encapsulated; Catalysis; Epoxidation; Hydrogen peroxide; HYDROGEN-PEROXIDE; DIOXYGEN ACTIVATION; HETEROPOLYANIONS; EPOXIDATION; CLUSTERS; COMPLEX; POLYOXOANIONS; COORDINATION; STABILITY; CHEMISTRY;

D O I：

10.1016/j.inoche.2014.02.008

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A stable sandwich type Keggin polyoxometalate, Na4K5[K3Cu3(NO3)(A-alpha-PW9O34)(2)], has been synthesized and crystallized by a simple reaction method. Elemental analysis, FUR, UV-vis, X-ray single crystal, thermal gravimetry, and cyclic voltammetty were used for the characterization of synthesized POM. The TEA salt of [K3Cu3(PW9O34)(2)](9-) revealed high catalytic activity and 74-99% selectivity in the liquid phase epoxidation of alkenes with aqueous H2O2. The X-ray structure of this complex reveals that three Cu(II) ions are sandwiched between two A-alpha-PW9O34 moieties and that a nitrate monoanion is encapsulated in the same plane as the three Cu(II) atoms. The nitrate is coplanar with the three copper atoms, which are each in a distorted square-pyramidal environment. After recrystallization, the NO3- group in the central belt didn't exit, in which this phenomenon is attributed to the type of counterion in the complex (as a result of mixing Na+ and K+ as counterions). This compound showed excellent stability in different pH and also didn't dissociate with hydrogen peroxide. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：39 / 44

页数：6

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