基于 XY4 型桥联配体有机-无机杂化化合物介电性质研究

Dielectric transition materials are a type of molecule-based responsive materials with switchable dielectric constant between low- and high-dielectric states. Organic-inorganic hybrid compounds are good candidates to show dielectric transition behaviors. The excellent attributes of organic and inorganic compounds, the diversity of structures and the combination methods, easy processing, fluorescence and phosphorescence, as well as good electromigration rate, thermal stability, tunability, magnetic properties of inorganic compounds, which can be combinated effectively by the family of compounds. Therefore, the type of compounds can design versatile functional molecular-based dielectric materials with optics, electrics, magnetics, etc. This project intends to employ XY4-bridge ligands (XY4 = ClO4、BF4、PO4 or SO4, etc) to coordinate with alkali metal ions in monoatomic and/or diatomic chelation coordination modes. In the meanwhile, the introduction of non-polar organic and polar organic cations as guest molecules is expected to synthesize the class of AB(XY4)3 perovskite compounds. Researches on the systems of organic-inorganic hybrid response dielectrics based on XY4-bridged ligands have been reported in our work. Considering its broad development space and attractive prospects, we have explored response dielectric materials based on the system, in a certain extent, which may promote the theoretical developments and practical applications of molecular-based poly-stable materials.

介电转变材料是一类能发生高、低介电态转变的分子响应材料，在开关、传感等方面具有潜在应用。有机-无机杂化化合物是一类典型的能够表现介电转变的体系。这类能将有机化合物和无机化合物的优良特性有效的进行结合，表现为含有有机化合物结构和结合方式多样性、易于加工、荧光和磷光等特性的同时，又含有无机化合物良好的电迁移率、热稳定性、带系可调性、磁性等特性。因此，该类化合物可能设计出同时具有光、电、磁等其他性质的多功能分子基介电材料。本项目拟采用XY4(XY4 = ClO4、BF4、PO4或SO4等)桥联配体以单原子配位和/或双原子螯合配位模式与碱金属离子配位。引入非极性有机阳离子和极性有机阳离子作为客体分子，预期合成AB(XY4)3型钙钛矿化合物。我们对基于XY4－桥联配体有机-无机杂化响应型介电体系的研究已有报道，考虑到其广阔发展空间和诱人前景，探索出基于该体系的响应型介电材料，将为分子基多稳

分子功能材料以其重量轻，机械灵活，结构可调，易于加工的固有属性，在材料科学和技术应用方面存有诱人的应用前景。动态响应分子功能化合物作为一类潜在的分子功能材料，它可表现出诸多物理和化学性质的产生和转变，如介电转变。具体表现为，在外界刺激下可实现介电常数在高介电态和低介电态之间进行相互转变,它在开关、传感等方面具有潜在应用。本项目基于有机-无机杂化钙钛矿这种有效构建功能特性材料的手段，通过A位、B位和X位离子的有效置换，合成出不同的具有介电开关响应的杂化钙钛矿分子相变化合物。该项目的研究，在扩充了可切换介电常数的杂化钙钛矿型分子相变化合物的同时，在一定程度上也丰富了杂化钙钛矿型分子相变化合物的种类。通过调控这类杂化化合物的有机部分和无机部分以实现其性能的优化，探索微观结构对宏观性质的调控作用，促进刺激响应型杂化钙钛矿型分子相变化合物的研究发展。