Electrical and optical response of phthalocyanine thin films to No2

Second Generation Nanostructured Metal Oxide Matrices to Increase the Thermal Stability of CO and NO2 Sensing Layers Based on Iron(II) Phthalocyanine

“…This mechanism is consistent with previously published results. [26,38] As discussed in Section 1, it has been suggested that the addition of nitrogen-donor ligands such as pyridine, IMD, DBA, DA, and piperidine leads to strong coordination with FePc, which allows it to be dissolved in solution. Moreover, during the sensing process one axial ligand has to be exchanged with either NO 2 or CO.…”

“…[1,20] A sensing mechanism for the recognition of NO 2 by nanostructured films incorporating phthalocyaninato-iron(II) has been proposed by our research group. [20,26] This mechanism is based on the ligand exchange of an electron donor (NR 3 ) by a p-electron acceptor (NO 2 ), which results in a decrease in the absorbance of the Q-band (which is at a wavelength between 655 and 670 nm). The same sensing mechanism is proposed for CO recognition based on the experimental results (Fig.…”

“…The bis(BA)Fe(II)Pc complex has also been structurally characterized by NMR methods. [26] Among the carbon donors, the isocyanide bis adduct has attracted the most attention. The Mössbauer spectra of the bis adducts of FePc with some nitrogen and carbon donors have been studied extensively.…”

“…In addition, we have shown recently via NMR experiments that the FePc(DA) 2 complex in THF solution is involved in a ligand exchange process where one amine ligand is replaced by a CO molecule. [26] Monocarbonyl complexes of Fe(II)Pc, FePc(CO)L, with L being a ligand with an oxygen, sulfur, or nitrogen donor atom (L= THF, H 2 O, CHOD, dimethyl sulfoxide, tetrahydrothiophene, ammonia, n-propylamine, diethylamine, triethylamine, diethylacetamide, pyridine, piperidine, hexamethylphosphoramide, and triphenylphosphine oxide) have been prepared and characterized by elemental analysis and infrared spectroscopy. [37] The dicarbonyl compound FePc(CO) 2 has also been isolated by exposing FePc in a hydrocarbon solvent to CO at high pressure.…”

“…[1,[20][21][22][23][24][25][26][27][28][29][30] The ability of metal(II) Pcs to coordinate additional ligands or solvent molecules containing nitrogen or oxygen donor atoms is well known; in general, the ligands attach above and below the plane of the macrocycle. [31] The six-fold-coordinated complexes formed between FePc and pyridine, [32] 4-methylpyridine, [33] 4-methylpiperidine, [34] and benzylamine (BA) [26] are the only available examples of X-ray structures containing nitrogen donors. The bis(BA)Fe(II)Pc complex has also been structurally characterized by NMR methods.…”