Synthesis of Main Group Compounds and Materials with Novel Structures and Optoelectronic Properties

具有新颖结构和光电性能的主族化合物和材料的合成

• 批准号: 2246810
• 负责人: John Protasiewicz
• 金额: $ 59万
• 依托单位: Case Western Reserve University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-06-15 至 2026-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2246810&HistoricalAwards=false
• 关键词: Synthesis; Main; Group; Compounds; Materials

With the support of the Chemical Synthesis program of the Division of Chemistry, Professor John Protasiewicz and his students at the Department of Chemistry at Case Western Reserve University are preparing compounds with P=C-containing extended pi-electron systems. The inclusion of P=C units permits the optical and electronic properties of the material to be tuned in order to maximize the behavior of the material. A motivation for these studies is a need for economical means to manufacture highly efficient lighting and displays. Methods that utilize inexpensive and abundant elements and ones that minimize the formation of wasteful and toxic byproducts are especially attractive. This project envisions the preparation of low cost/lightweight/processable plastics and materials related to light emitting technology. Examples, include polymers, molecular electronics, light emitting diodes, photovoltaics, and flexible electronics. The students trained and educated as part of this research program are being prepared to enter tomorrow's skilled workforce in industry and education. In addition to the technical broader impacts related to advanced manufacturing, Professor Protasiewicz will co-organize and run programs directed at raising awareness of mental health issues among graduate students and faculty.Reactive main group systems will be synthesized and their photophysical properties interrogated to advance and create new paradigms in main group photophysical chemistry. This work explores several interconnected research threads, inspired from previous studies on luminescent 1,3-benzoxaphospholes and 1,3-benzazaphospholes. A new class of photoluminescent compounds (phospha-azulenes) bearing P=C bonds will be prepared to display fluorescence from the S2 (not S1) excited state, thus breaking Kasha's rule. Anti-Kasha compounds are rare and have desirable photophysical properties. Unconventional hydrogen bonding between N-heterocyclic carbenes and fluorescent secondary amines will be exploited to develop the supramolecular chemistry of dicarbenes that can undergo hydrogen bonding to a fluorophores containing two NH functional groups, which will offer new opportunities to develop materials that could act as turn-on fluorescent sensors for select applications. Previous studies also uncovered an unusual reaction that converts ortho-phosphinophenol to benzodioxaphosphole. This process involves removing 6 hydrogen atoms and making new PP and PO bonds. This process will be extended to other types of bonds and and attempts will be made to make the process catalytic. The metal-free systems to be developed in this research move away from previously reported strategies based on expensive and/or toxic transition metals and concentrates on elements that are less toxic and more earth abundant. Combined, these efforts aim to advance and showcase the advantages that main group elements can offer to the greater field of optoelectronic and structural materials.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.

在化学系化学综合计划的支持下，凯斯西部储备大学化学系教授及其学生正在准备含有p = C含C的扩展Pi-Electron Systems的化合物。 P = C单元的包含允许调谐材料的光学和电子性能，以最大程度地提高材料的行为。这些研究的动机是需要经济的手段来制造高效的照明和展示。利用廉价且丰富的元素以及最小化浪费和有毒副产品形成的方法特别有吸引力。该项目设想准备低成本/轻巧/可加工塑料以及与发光技术有关的材料。例如，包括聚合物，分子电子，发光二极管，光伏和柔性电子设备。作为该研究计划的一部分，受过培训和教育的学生正在准备进入明天的工业和教育方面的熟练劳动力。除了与先进制造业相关的技术广泛影响外，Protasiewicz教授还将共同组织和运行计划，旨在提高研究生和教职员工的心理健康问题的认识。反应性主体系统将合成，并将其摄影特性质疑，以促进并在Maint Group fopophysical iphtophysical Chemive中提高和创建新的典型。 这项工作探讨了几个相互联系的研究线程，这是从先前对发光1,3-苯二磷磷和1,3-苯甲酰磷磷的研究灵感的启发。 一类新的光致发光化合物（磷酸化合物）轴承p = c键将准备从S2（而不是S1）激发态显示荧光，从而破坏了Kasha的规则。 抗喀沙化合物很少见，具有理想的光物理特性。 N-杂环碳烯和荧光继发胺之间的非常规的氢键将被利用，以开发Dicarbenes的超分子化学，这些化学可以将氢键结合到包含两个NH功能组的荧光照相上，这将提供新的机会，以开发可作为特定荧光传感器的材料，可作为特定荧光传感器。 先前的研究还发现了一种不寻常的反应，该反应将正磷酸酚转化为苯二氧化磷磷酸。 该过程涉及去除6种氢原子并制造新的PP和PO键。 该过程将扩展到其他类型的债券，并尝试使过程催化。这项研究中要开发的无金属系统脱离了基于昂贵和/或有毒过渡金属的先前报道的策略，并将其集中在毒性较小，地球更丰富的元素上。 这些努力结合起来，旨在提高和展示主要小组要素可以为光电和结构材料提供更大领域的优势。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的审查标准通过评估来获得支持的。