Collaborative Research: Diarylethene-based Crystalline Materials: Design and Function

合作研究：二芳基乙烯基晶体材料：设计和功能

• 批准号: 2003336
• 负责人: Jeffrey Rack
• 金额: $ 13.7万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2023-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2003336&HistoricalAwards=false
• 关键词: Collaborative; Research; Diarylethene; based; Crystalline

Non-technical Abstract:In this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, Associate Professor Jason Benedict of the University at Buffalo, The State University of New York and Professor Jeffrey Rack of the University of New Mexico are developing crystalline porous materials that are activated by UV light. These molecular materials comprise photo-active chemical groups that change shape when exposed to light. The light-driven molecular transformations cause the pores (holes) and channels in the crystals to change shape and dimension. This leads to the development of smart materials capable of selectively absorbing or releasing guest molecules, but only when exposed to the proper wavelength of light. Experiments using ultrafast pulses of light and/or X-rays reveal critical insights into the fundamental photochemistry that occurs in these novel materials. The research establishes much needed design principles to understand and enable the rational design of next-generation photo-responsive materials. The educational projects include the continuation of the U.S. Crystal Growing Competition, and a nation-wide crystal growing competition, that brings concepts of crystals and crystal growth into K-12 classrooms and home schools throughout the country by providing participants a fun and exciting hands-on STEM-based contest.Technical Abstract:Integrating the photo-responsive properties of diarylethenes into hybrid crystalline systems transforms these traditionally passive materials into active materials that change their chemical or electronic properties in response to light stimulus. The PIs' innovative approach - using ring-closed diarylethene building units - ensures the reliable and predictable synthesis of photo-responsive crystalline materials. Given the importance of extending longevity in sustainable materials development, the proposed research also includes an effort to identify and understand the root causes of fatigue in these systems. The photochemical reactions in these materials, both desired and undesired, are precisely monitored through advanced spectroscopic and in situ X-ray diffraction methods. These experiments provide a crucial link between the molecular photochemistry and the photophysics of the proposed hybrid crystalline solids. It is anticipated that the design principles and experimental techniques developed through this collaborative research program can be extended to other photochromic systems. The outreach efforts bring concepts of crystal growth classrooms across the country through the continued growth of the US Crystal Growing Competition.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：在该项目中，由材料研究部的固态和材料化学计划支持，布法罗大学的副教授Jason Benedict，纽约的州立大学和新墨西哥州大学的Jeffrey Rack教授正在开发由UV光激活的结晶多孔材料。这些分子材料包含光活性化学基团，当暴露于光时会改变形状。光驱动的分子转变导致晶体中的孔（洞）和通道改变形状和尺寸。这导致智能材料的发展，能够选择性地吸收或释放客体分子，但只有当暴露在适当波长的光。使用超快光脉冲和/或X射线的实验揭示了这些新型材料中发生的基本光化学的关键见解。该研究建立了急需的设计原则，以理解和实现下一代光响应材料的合理设计。这些教育项目包括美国晶体生长竞赛的延续，以及全国范围的晶体生长竞赛，通过为参与者提供有趣和令人兴奋的动手STEM竞赛，将晶体和晶体生长的概念带入全国各地的K-12教室和家庭学校。技术摘要：整合照片-二芳基乙烯进入混合结晶体系的响应特性将这些传统的被动材料转变为改变其性质的活性材料对光刺激反应的化学或电子性质。PI的创新方法-使用闭环二芳基乙烯结构单元-确保了光响应晶体材料的可靠和可预测的合成。鉴于延长寿命在可持续材料开发中的重要性，拟议的研究还包括努力确定和了解这些系统中疲劳的根本原因。通过先进的光谱和原位X射线衍射方法精确监测这些材料中的光化学反应，无论是期望的还是不期望的。这些实验提供了一个关键的分子光化学和建议的混合晶体固体的光物理之间的联系。预计通过这项合作研究计划开发的设计原理和实验技术可以扩展到其他光致变色系统。通过美国晶体生长竞赛的持续发展，外展工作将晶体生长教室的概念带到了全国各地。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。