金属和分子化合物之间形成的分子界面为未来的光电和自旋电子器件提供了巨大的潜力。这里,结合理论和实验的光谱显微镜方法用于显示在镍四苯基卟啉和铜之间的界面处发生的电荷转移改变了[Ni(II),S=0到[Ni(I),S=1/2]。化学活性Ni(I),即使在埋藏的多层系统中,可以用二氧化氮功能化,允许选择性调谐切换到[Ni(II),S=1]状态。虽然Ni充当可逆自旋开关,发现大环主链的电子结构,前沿轨道主要是局部化的,仍然不受影响。这些发现为使用当前的基于卟啉的系统作为实现多功能设备的平台铺平了道路,其中磁性和光学/传输特性可以通过独立的刺激同时控制。
Molecular interfaces formed between metals and molecular compounds offer a great potential as building blocks for future opto-electronics and spintronics devices. Here, a combined theoretical and experimental spectro-microscopy approach is used to show that the charge transfer occurring at the interface between nickel tetraphenyl porphyrins and copper changes both spin and oxidation states of the Ni ion from [Ni(II), S = 0] to [Ni(I), S = 1/2]. The chemically active Ni(I), even in a buried multilayer system, can be functionalized with nitrogen dioxide, allowing a selective tuning of the electronic properties of the Ni center that is switched to a [Ni(II), S = 1] state. While Ni acts as a reversible spin switch, it is found that the electronic structure of the macrocycle backbone, where the frontier orbitals are mainly localized, remains unaffected. These findings pave the way for using the present porphyrin-based system as a platform for the realization of multifunctional devices where the magnetism and the optical/transport properties can be controlled simultaneously by independent stimuli.