Clay intercalated Cu(II) amino acid complexes: Synthesis, spectroscopy and catalysis
Clay intercalated Cu(II) amino acid complexes: Synthesis, spectroscopy and catalysis
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DOI：
10.1180/claymin.1996.031.4.06
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发表时间：
1996-12-01
期刊：
影响因子：
1.5
通讯作者：
Schoonheydt, RA
中科院分区：
文献类型：
--
作者：
Fu, L;Weckhuysen, BM;Schoonheydt, RA
通过简单的阳离子交换法，将赖氨酸铜（2）（2+）和组氨酸铜（2）（2+）的配合物插层到皂石粘土层间。成功的固定化获得了氨基酸：铜2+的比例为5，和pH值为10和7.3的赖氨酸和组氨酸，分别。采用电子自旋共振（ESR）、漫反射光谱（DRS）和X射线衍射（XRD）对合成的材料进行了表征。浅蓝色粘土的特征在于具有轴对称的ESR谱，A（平行于）= 192 G，g（平行于）= 2.23和g（垂直于）= 2.07，以及600 nm附近的d-d吸收带，这是由于嵌入的平面Cu 2 +-络合物。氨与这些插层复合物可逆地相互作用，表明存在自由配位位点。合成的新材料在以叔丁基过氧化氢为氧化剂的各种氧化反应中具有活性。
Complexes of Cu(lysine)(2)(2+) and Cu(histidine)(2)(2+) have been intercalated between the layers of saponite clays by a simple cation exchange procedure from aqueous solutions of preformed Cu(amino acid)(2)-complexes. Successful immobilization was obtained with an amino acid:Cu2+ ratio of 5, and a pH of 10 and 7.3 for lysine and histidine, respectively. The synthesized materials were investigated as powders and as thin films by electron spin resonance (ESR), diffuse reflectance spectroscopy (DRS) and X-ray diffraction (XRD). The light blue clays are characterized by an axially symmetric ESR spectrum with A(parallel to) = 192 G, g(parallel to) = 2.23 and g(perpendicular to) = 2.07, and a d-d absorption band around 600 nm, due to the intercalated planar Cu2+-complexes. Ammonia interacts reversibly with these intercalated complexes, suggesting the presence of a free coordination site. The novel synthesized materials are active in various oxidation reactions with t-butyl hydroperoxide as oxidant.