In the present work, we determined the electrical properties of octachlorinated metallophthalocyanines with Co(II) and Cu(II) ions as metal centers. We engaged them in heterojunctions, with lutetium bisphthalocyanine as a partner. Surprisingly, cobalt and copper complexes show opposite behaviors, the first being an n-type material whereas the latter is a p-type material, as deduced from the response of the heterojunctions towards ammonia; showing the unusual key role played by the metal center. While the LuPc2/Cu(Cl8Pc) complex exhibits a negative response to ammonia, the LuPc2/Co(Cl8Pc) complex exhibits a positive response to ammonia, with a sensitivity of 1.47% ppm-1 at concentrations lower than 10 ppm and a limit of detection of 250 ppb. All the devices operate at room temperature and in real atmosphere.

中文翻译：

---

八氯金属酞菁基异质结的 p 型和 n 型电导行为，金属的关键作用

在目前的工作中，我们确定了以 Co(II) 和 Cu(II) 离子为金属中心的八氯化金属酞菁的电学性质。我们将它们用于异质结，并以镥双酞菁作为合作伙伴。令人惊讶的是，钴和铜配合物表现出相反的行为，首先是n型材料，而后者是p-型材料，从异质结对氨的响应推导出来；展示了金属中心所发挥的不同寻常的关键作用。而 LuPc2/Cu(Cl8Pc) 络合物对氨表现出负面反应，LuPc2/Co(Cl8Pc) 络合物对氨有阳性反应，灵敏度为 1.47% ppm-1浓度低于 10 ppm，检测限为 250 ppb。所有设备均在室温和真实大气中运行。