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Our attempts at targeted design of networks started with the choice of suitable building units and a coupling reaction with an effective catalyst. Figure 1 summarizes general aspects of our design: D4R cages with haloaryl terminal groups are versatile, highly connectable units for formation of inorganic–organic hybrid polymers by means of well-developed cross-coupling reactions, for example, Heck reaction,Suzuki coupling, and Sonogashira coupling. Compound BrPh-D4R was chosen because it can be synthesized on a practical scale with high regio- and stereoselectivity by state-of-the-art cross-metathesis. As D4R cages resemble the secondary building units of several crystalline zeolite frameworks, linker molecules were selected by considering the default three-periodic nets that have practically been used to design crystalline framework materials including COFs. As mentioned above, however, it is nearly impossible to achieve polymer networks with long-range order, since most of them are formed under kinetic control. As a result, the three-periodic nets serve as merely qualitative guides to ideal structures. Three zeolite topologies (ACO,AFY, and LTA) can be built from D4R cages as the sole secondary building units. In their frameworks, the D4R cages are connected through two-coordinate linear linkers;the only difference is the orientation of the D4R cages. Considering the periodic arrangement of the discrete cages in such frameworks, the maximum symmetry of the ACO topology can be constructed from 1808 linear linkers without the need to rotate the D4R cages, and thus ACO appears to be the default topology. Accordingly, one can expect connection of the D4R cages with rigid, linear molecules (e.g.,1 and 2) to lead networks with local ACO-like structure 。 |
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铜虫 (正式写手)
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大四写论文: 金币+25, ★有帮助 2015-03-23 12:06:35
大四写论文: 金币+25, ★有帮助 2015-03-23 12:06:35
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我们试图在网络有针对性的设计开始与合适的建筑单位的选择和一个有效的催化剂的偶联反应。图1总结了我们的设计概况：D4R笼卤代芳基基团可连接单元的多功能，高度发达的交叉偶联反应，形成无机有机杂化聚合物例如–，Heck反应和Sonogashira偶联，铃木偶联。化合物brph-d4r被选中是因为它可以合成 在高区域和立体选择性的实际规模最先进的交叉复分解反应。作为像几个结晶沸石D4R笼框架的次级结构单元，连接分子由默认的三周期的渔网，几乎已经被用来设计结晶骨架材料包括截止频率选择。如上所述，然而，它具有长程有序实现聚合物网络几乎是不可能的，因为他们大多是动力学控制下形成的。作为一个结果，三周期网作为只有定性指导的理想结构。三沸石结构（ACO，斐，LTA）可由D4R笼作为唯一的 次级结构单元。在他们的框架，D4R笼子是通过两坐标线性连接；唯一的区别是D4R笼定位。考虑到这样一个框架的离散周期性排列的笼子，ACO拓扑最大的对称性可以由1808线性连接而不需要转动D4R笼，因此似乎是默认的拓扑算法。因此，人们可以期待的D4R笼刚性连接，线性分子（例如，1和2）导致网络的局部算法结构。 -------来自百度翻译。大四论文要求不高，用翻译软件谷歌或百度翻译初步翻译，然后自己整合用自己的话表达出来就行，注意专业术语的使用！！！ |
2楼2015-03-23 10:04:27
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捐助贵宾 (著名写手)
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Our attempts at targeted design of networks started with the choice of suitable building units and a coupling reaction with an effective catalyst. 我们试图对聚合物网络进行特定设计，首先我们得选择合适的建造单元，以及具有高效催化剂的耦合反应。 Figure 1 summarizes general aspects of our design: D4R cages with haloaryl terminal groups are versatile, highly connectable units for formation of inorganic–organic hybrid polymers by means of well-developed cross-coupling reactions, for example, Heck reaction,Suzuki coupling, and Sonogashira coupling. 图一总结了我们设计的综合面向：以haloaryl基团为终端的D4R笼分子是万能的，它们具有高度可连接单元，通过成熟的耦合反应（例如：赫克反应，铃木耦合反应，和薗头偶合反应 ），合成有机-无机杂化聚合物。 Compound BrPh-D4R was chosen because it can be synthesized on a practical scale with high regio- and stereoselectivity by state-of-the-art cross-metathesis. As D4R cages resemble the secondary building units of several crystalline zeolite frameworks, linker molecules were selected by considering the default three-periodic nets that have practically been used to design crystalline framework materials including COFs. 我们之所以会选择BrPh-D4R，是因为，通过最先进的复分解反应，它可以在高区和高立体选择性的实际条件下被合成。由于D4R笼分子与有些结晶水晶框架结构类似，考虑到默认的三周期聚合物网络在实际中已经被用来制作包括像COFs的水晶框架材料，所以我们选择了连接分子。 As mentioned above, however, it is nearly impossible to achieve polymer networks with long-range order, since most of them are formed under kinetic control. As a result, the three-periodic nets serve as merely qualitative guides to ideal structures. Three zeolite topologies (ACO,AFY, and LTA) can be built from D4R cages as the sole secondary building units. In their frameworks, the D4R cages are connected through two-coordinate linear linkers;the only difference is the orientation of the D4R cages. 然后，如上文所说，要制作长程有序的聚合物网络几乎是不可能的，因为这种长程有序的聚合物网络大多数是在动力学控制形成的。因此，三周期聚合物网络在这里仅仅作为一种定性的向导物质，是合成物结构想理想的方向发展。以D4R笼分子作为唯一的第二等建造单元，可以建立三钟沸石拓扑(ACO,AFY,和 LTA)。在这些拓扑结构中，D4R笼分子是通过二配位线性链接连接起来，它们之间唯一不同的是D4R笼分子朝向不同。 Considering the periodic arrangement of the discrete cages in such frameworks, the maximum symmetry of the ACO topology can be constructed from 1808 linear linkers without the need to rotate the D4R cages, and thus ACO appears to be the default topology. Accordingly, one can expect connection of the D4R cages with rigid, linear molecules (e.g.,1 and 2) to lead networks with local ACO-like structure 鉴于这些结构中，离散的笼分子的周期性排列，我们可通过1808线性连接，无需旋转D4R笼分子的朝向，从而实现ACO拓扑最大对称，因此，ACO拓扑自然成了默认拓扑了。与此对应，我们大可预测，通过精确的线性分子将D4R笼分子连接起来（e.g.,1 and 2），可以合成，具有与ACO类似的局部机构的聚合物网络。 |
3楼2015-03-23 12:35:03