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Understanding and Controlling Coupled Molecular Motion on Surfaces

理解和控制表面上的耦合分子运动

基本信息

批准号：
1708397
负责人：
Charles Sykes
金额：
$ 44.83万
依托单位：
Tufts University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-01 至 2020-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1708397&HistoricalAwards=false
关键词：
Understanding Controlling Coupled Molecular Motion

项目摘要

In this project funded by the Macromolecular, Supramolecular, and Nanochemistry Program of the Chemistry Division, Professor Charles Sykes and his students at Tufts University are investigating ways to couple single molecule devices, already pioneered by his research team with prior NSF funding, into molecular machines and molecular-sized devices capable of performing higher tasks. The ultimate goal of the work is the discovery of design principles for the construction of molecular machines and molecular-sized devices that can more easily integrate with existing technologies. A goal is to gain a better understanding of molecular motion. Control of molecular motion is crucial for the design of new approaches for unique new applications, including tiny molecular-sized pumps, sensors, and optoelectronics. To engage broad audiences in this project, the Sykes research team gives presentations about nanoscienceat local high schools with newly developed demonstrations. YouTube videos featuring the project results are produced. The group has developed a Science Fair between Tufts and Medford High which enables ~300 students per year to interact with graduate researchers about their science project presentations.Single molecule devices are capable of performing a number of functions from mechanical motion to simple computation. Their utility is somewhat limited, however, by difficulties associated with coupling them with either each other or with interfaces such as electrodes. This project takes a new approach using molecular self-assembly to produce 2D crystalline arrays of molecular rotors that display emergent properties like correlated rotational switching. The arrays are synthesized by the Ullmann reaction of precursor molecular rotors with a Cu (111) surface, yielding 2D networks of metal-organic complexes in which the rotary units can interact with each other. Scanning tunneling microscopy enables excitation of the individual rotor groups and the ability to study how reorientation of an individual molecular rotor affects its neighbors. By studying the effect of voltage, current, and tunneling gap distance on rotor motion, the mechanism of excitation will be explored. Altering the size and functionality of the precursor molecules enables control over the placement of the rotor units in the 2D molecular crystals and the ability to study the effect of rotor-rotor spacing and angle on correlated rotational switching. By changing the functionality of the rotor itself, both steric and dipolar coupling will be explored. Finally, chiral rotary units will be introduced as a way to induce unidirectional rotation via a flashing temperature ratchet-like mechanism.

在这个由化学系高分子、超分子和纳米化学项目资助的项目中，塔夫茨大学的Charles Sykes教授和他的学生正在研究如何将他的研究团队在NSF之前的资助下开创的单分子设备耦合到能够执行更高任务的分子机器和分子大小的设备中。这项工作的最终目标是发现构建分子机器和分子大小的设备的设计原则，这些设备可以更容易地与现有技术相结合。一个目标是更好地理解分子运动。分子运动的控制对于设计独特的新应用的新方法至关重要，包括微型分子大小的泵、传感器和光电子学。为了让更多的受众参与到这个项目中来，赛克斯研究小组在当地高中进行了纳米科学的演讲，并进行了新的演示。制作了以项目结果为特色的YouTube视频。该小组在塔夫茨和梅德福德高中之间开发了一个科学博览会，每年可以让大约300名学生与研究生互动，讨论他们的科学项目演示。单分子设备能够执行从机械运动到简单计算的一系列功能。然而，由于它们彼此耦合或与电极等接口耦合相关的困难，它们的用途在某种程度上受到限制。这个项目采用了一种新的方法，使用分子自组装来产生分子转子的2D晶体阵列，这些晶体阵列显示出相关的旋转开关等紧急性质。阵列是通过前体分子旋转体与铜(111)表面的乌尔曼反应合成的，产生了金属-有机络合物的2D网络，其中旋转单元可以相互作用。扫描隧道显微镜能够激发单个转子群，并能够研究单个分子转子的重新定向如何影响其邻居。通过研究电压、电流和隧道间距对转子运动的影响，探讨励磁机理。通过改变前体分子的大小和功能，可以控制转子单元在2D分子晶体中的位置，并能够研究转子-转子间距和角度对相关旋转开关的影响。通过改变转子本身的功能，我们将探索立体耦合和偶极耦合。最后，手性旋转单元将作为一种通过闪温棘轮机制诱导单向旋转的方式被引入。

项目成果

期刊论文数量（6）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Towards the directional transport of molecules on surfaces

DOI：
10.1016/j.tet.2017.06.032
发表时间：
2017-08
期刊：
Tetrahedron
影响因子：
2.1
作者：
Natalie A. Wasio;C. J. Murphy;Dipna A. Patel;Daniel S. Wei;D. Sholl;E. Sykes
通讯作者：
Natalie A. Wasio;C. J. Murphy;Dipna A. Patel;Daniel S. Wei;D. Sholl;E. Sykes

Hypothetical Efficiency of Electrical to Mechanical Energy Transfer during Individual Stochastic Molecular Switching Events

单个随机分子切换事件期间电能到机械能转移的假设效率

DOI：
10.1021/acsnano.0c04082
发表时间：
2020
期刊：
ACS Nano
影响因子：
17.1
作者：
Larson, Amanda M.;Balema, Tedros A.;Zahl, Percy;Schilling, Alex C.;Stacchiola, Dario J.;Sykes, E. Charles
通讯作者：
Sykes, E. Charles

Chirality at two-dimensional surfaces: A perspective from small molecule alcohol assembly on Au(111)

二维表面的手性：Au(111) 上小分子醇组装的视角

DOI：
10.1063/1.5035500
发表时间：
2018
期刊：
The Journal of Chemical Physics
影响因子：
0
作者：
Liriano, Melissa L.;Larson, Amanda M.;Gattinoni, Chiara;Carrasco, Javier;Baber, Ashleigh E.;Lewis, Emily A.;Murphy, Colin J.;Lawton, Timothy J.;Marcinkowski, Matthew D.;Therrien, Andrew J.
通讯作者：
Therrien, Andrew J.

Controlling Molecular Switching via Chemical Functionality: Ethyl vs Methoxy Rotors

通过化学官能团控制分子开关：乙基与甲氧基转子

DOI：
10.1021/acs.jpcc.9b06664
发表时间：
2019
期刊：
The Journal of Physical Chemistry C
影响因子：
0
作者：
Balema, Tedros A.;Ulumuddin, Nisa;Murphy, Colin J.;Slough, Diana P.;Smith, Zachary C.;Hannagan, Ryan T.;Wasio, Natalie A.;Larson, Amanda M.;Patel, Dipna A.;Groden, Kyle
通讯作者：
Groden, Kyle

Evidence for biological effects in the radiosensitization of leukemia cell lines by PEGylated gold nanoparticles