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 [Formula: see text]-type material whereas the latter is a [Formula: see text]-type material, as deduced from the response of the heterojunctions towards ammonia; showing the unusual key role played by the metal center. While the LuPc[Formula: see text]/Cu(Cl[Formula: see text]Pc) complex exhibits a negative response to ammonia, the LuPc[Formula: see text]/Co(Cl[Formula: see text]Pc) complex exhibits a positive response to ammonia, with a sensitivity of 1.47% ppm[Formula: see text] 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.
A detailed synthetic procedure based on the use of urea, dichlorophthalic acid, respective transition metal halides and [NH4]2[MoO4] as a catalyst in the melt or by using 1,2,4-trichlorobenzene as a high-boiling inert solvent is described to gain 2,3,9,10,16,17,23,24-metallooctachlorophthalocyanines (MPcCl8 compounds with M=Mn, Fe, Co, Ni, Cu). In cases that a first purification by subsequent treatment of the crude materials with HCl, NaOH and HCl would not give rise to analytically pure compounds, a second novel purification by using pyridine is described. The degree of purity, exceeding always 98%, is determined by thermogravimetric analysis. Comparative IR, UV/Vis and PXRD studies of the MPcCl8 compounds are reported.
本文介绍了一种详细的合成方法,该方法基于利用尿素、二氯苯酸、相应的过渡金属卤化物和[NH4]2[MoO4]作为催化剂,在熔融状态下或使用1,2,4-三氯苯作为高沸点惰性溶剂,制备2,3,9,10,16,17,23,24-金属八氯酞菁化合物(M为Mn,Fe,Co,Ni,Cu)。对于粗杂质较多的原料,如果经过HCl、NaOH和HCl的连续处理后不能得到分析纯的化合物,则介绍了一种使用吡啶的新型二次纯化方法。通过热重分析确定了其纯度度数始终超过98%。报告了MPcCl8化合物的比较红外、紫外/可见和X射线衍射研究结果。