Latini, Alessandro published the artcileA novel water-resistant and thermally stable black lead halide perovskite, phenyl viologen lead iodide C22H18N2(PbI3)2, Safety of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Dalton Transactions (2020), 49(8), 2616-2627, database is CAplus and MEDLINE.
A novel black organoammonium iodoplumbate semiconductor, namely Ph viologen lead iodide C22H18N2(PbI3)2 (PhVPI), was successfully synthesized and characterized. This material showed phys. and chem. properties suitable for photovoltaic applications. Indeed, low direct allowed band gap energy (Eg = 1.32 eV) and high thermal stability (up to at least 300°) compared to methylammonium lead iodide CH3NH3PbI3 (MAPI, Eg = 1.5 eV) render PhVPI potentially attractive for solar cell fabrication. The compound was extensively characterized by x-ray diffraction (performed on both powder and single crystals), UV-visible diffuse reflectance spectroscopy (UV-visible DRS), UV-photoelectron spectroscopy (UPS), FTIR spectroscopy, TG-DTA, and CHNS anal. Reactivity towards water was monitored through x-ray powder diffraction carried out after prolonged immersion of the material in water at room temperature Unlike its Me ammonium counterpart, PhVPI proved to be unaffected by water exposure. The lack of reactivity towards water is to be attributed to the quaternary nature of the nitrogen atoms of the Ph viologen units that prevents the formation of acid-base equilibrium when in contact with water. However, PhVPI’s thermal stability was evaluated by temperature-controlled powder XRD measurements following an hour-long isothermal treatment at 250 and 300°. In both cases no signs of decomposition could be detected. However, the compound melted incongruently at 332° producing, upon cooling, a mostly amorphous material. PhVPI is slightly soluble in DMF (â? mM) and highly soluble in DMSO. Nevertheless, its solubility in DMF can be dramatically increased by adding an equimolar amount of DMSO. Therefore, Ph viologen lead iodide can be amenable for the fabrication of solar devices by spin coating as actually done for MAPI-based cells. The crystal structure, determined by single crystal x-ray diffraction using synchrotron radiation, turned out to be triclinic and consequently differs from the prototypal perovskite structure. In fact, it comprises infinite double chains of corner-sharing PbI6 octahedra along the a-axis direction with Ph viologen cations positioned between the columns. Finally, the present determination of PhVPI’s electronic band structure achieved through UPS and UV-visible DRS is instrumental in using the material for solar cells.
Dalton Transactions published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Safety of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem