The intercalation of n-alkyldiamines into crystalline layered titanate
The intercalation of n-alkyldiamines into crystalline layered titanate
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DOI：
10.1016/s0025-5408(00)00426-8
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发表时间：
2000-10-01
影响因子：
5.4
通讯作者：
de Farias, RF
中科院分区：
文献类型：
--
作者：
Airoldi, C;Nunes, LM;de Farias, RF
合成、表征了N-烷基二胺H2 N（CH 2）（n）NH 2（n = 2，3，4，6，7，8）与层状水合钛酸H2 Ti4 O 9的插层反应。nH（2）O。从元素分析中，提出了插层化合物的下式：（C2H8N2）（0.3）-H2Ti4O9.0.40H（2）O，（C3H10N2）（0.6）H2Ti4O9.0.89H（2）O、（C4H12N2）（0.3）H2Ti4O9.0.40H（2）O、（C6H16N2）（0.6）-H2Ti4O9.0.92H（2）O、（C7H18N2）（0.5）H2Ti4O9.0.50H（2）O和（C8H20N2）（0.6）H2Ti4O9.0.60H（2）O。这些基质的X-射线衍射图显示，对于插入的n-烷基二胺的C-2-C-8序列，原始基质的920 μ m层间距的d-间距值分别增加到1118、1318、1549、1662、1720和1766 μ m。红外数据与位于腔空间中的二胺的质子化氮原子一致。含水基质在热重曲线上表现出两个质量损失步骤，对应于物理吸附和晶格水分子的释放。由于有机部分的释放，观察到插层基质的第三次质量损失。根据这些值，由有机链中的碳数表示的插层基质可以按以下热稳定性顺序排序：C-4 > C-2 > C-3与C-6全等> C-7与C-8全等。插层的n-烷基二胺的最低量给出了最大的混合物的热稳定性。(C)2001爱思唯尔科技有限公司版权所有。
The synthesis, characterization, and intercalation of n-alkyldiamines H2N(CH2)(n)NH2 (n = 2, 3, 4, 6, 7, and 8) into layered hydrous tetratitanic acid H2Ti4O9. nH(2)O are reported. From the elemental analysis, the following formula were proposed for the intercalated compounds: (C2H8N2)(0.3)-H2Ti4O9.0.40H(2)O, (C3H10N2)(0.6)H2Ti4O9.0.89H(2)O, (C4H12N2)(0.3)H2Ti4O9.0.40H(2)O, (C6H16N2)(0.6)-H2Ti4O9.0.92H(2)O, (C7H18N2)(0.5)H2Ti4O9.0.50H(2)O and (C8H20N2)(0.6)H2Ti4O9.0.60H(2)O. X-ray diffraction patterns for these matrices showed that the 920 pm interlayer space of the original matrix has the d-spacing values increased to 1118, 1318, 1549, 1662, 1720, and 1766 pm, respectively, for the C-2-C-8 sequence of intercalated n-alkyldiamine. The infrared data are in agreement with the protonated nitrogen atoms of the diamines located in the cavity space. The hydrous matrix showed two mass loss steps in the thermogravimetric curve, corresponding to the release of physisorbed and lattice water molecules. A third mass loss was observed for the intercalated matrices due to the release of organic moiety. From these values, the intercalated matrices represented by the number of carbons in the organic chains can be ordered in the following sequence of thermal stability: C-4 > C-2 > C-3 congruent to C-6 > C-7 congruent to C-8. The lowest amount of intercalated n-alkyldiamines gave the largest thermal stability of the hybrid. (C) 2001 Elsevier Science Ltd. All rights reserved.