Synthesis and investigation of mono- and multinuclear molecular coordination compounds with physical and chemical induced electronic multistability

单核和多核分子配位化合物的合成和研究，这些化合物可以被捕获在各种电子状态中（获得前所未有的高自旋跃迁，例如S = 6到S größer gleich 8，或S = 5/2到S = 10/2）。这种电子多稳定性是物理的（光，p，T）或化学的（溶剂化物等）。诱导和物理研究（4 - 400 K;通过T和激光器在UV-维斯和IR区域激发：二极管、Ar+离子、Ti-Al 2 O3），通过穆斯堡尔谱和UV/维斯/NIR电子光谱进行显微监测，并通过SQUID磁力计进行宏观监测。将分子开关（磁开关）结合到分子配位化合物中，期望分子效应与磁响应之间的协同相互作用。使用的化合物类型：（1）硝基金属配合物（金属-配体电荷转移;例如硝普钠，Na 2 [Fe（CN）5 NO] 2 H2O，光在基态和两个长寿命亚稳激发态之间相互转换），（2）具有光诱导异构性的金属络合物（配体异构化与自旋状态的变化;例如顺-反），（3）金属-金属电荷转移（例如钴-铁氰化物），和（4）金属中心激发（例如铁（II）化合物）。这种多稳态化合物正在考虑用于技术应用，如高密度存储、自适应材料、显示器、纳米机器和探索生物过程的模型。

Synthesis and investigation of mono and multinuclear molecular coordination compounds, which can be trapped in various electronic states (accessing unprecedented high-spin transitions, e.g. S = 6 to S größer gleich 8, or S = 5/2 to S = 10/2). This electronic multistability is physically (light, p, T) or chemically (solvates, etc.) induced and physically investigated (4 - 400 K; excited in UV-VIS and IR region via T and lasers: diodes, Ar+-ion, Ti-sapphir) monitored microscopically by Mössbauer spectroscopy and UV/VIS/NIR electron spectra and macroscopically by SQUID magnetometer. Molecular switches (synthons) are combined to molecular coordination compounds expecting synergistic interplays between molecular effects with magnetic responses. Used types of synthons compounds: (1) nitro-metal complex (metal-to-ligand charge transfer; e.g. nitroprussiat, Na2[Fe(CN)5NO]2H2O, light interconverts between ground state and two long lived metastable exited states), (2) metal complex with light induced isomerism (ligand isomerisation with change of spin state; e.g. cis-trans), (3) metal-to-metal charge transfer (e.g. cobalt-iron cyanides), and (4) metal-centered excitation (e.g. iron(II) compounds). Such multistable compounds are under consideration for technical application as high density storage, as adaptive materials, in displays, towards nanoscopic machines and serve as model to explore biological processes.