Synthesis of new photosensitive H₂BBQ²⁺[ZnCl₄]²⁻/[(ZnCl)₂(μ-BBH)] complexes, through selective oxidation of H₂O to H₂O₂

Abstract

A new two-electron photosensitizer, HBBQ[ZnCl]/[(ZnCl)(μ-BBH)] (BBQ stands for 2,5-bis[bis(pyridin-2-ylmethyl)amino]-1,4-quinone and BBH stands for 2,5-bis[bis(pyridin-2-ylmethyl)amino]-1,4-hydroquinone), has been synthesized and the oxidation state of the ligand was determined by X-ray crystallography and NMR spectroscopy. Under light illumination the HBBQ[ZnCl] + ZnCl is reduced quantitatively to [(ZnCl)(μ-BBH)] (pH ∼ 5) oxidizing HO to HO as is evident by trap experiments. Electrochemistry gave a reversible two-electron ligand-centered redox wave for [(ZnCl)(μ-BBH)]. UV-Vis, luminescence and EPR spectroscopies reveal the slow formation of a stable quinone diradical, intermediate of the reaction. DFT calculations are in agreement with the proposed mechanism. Based on this property an aqueous {[(ZnCl)(μ-BBH)]||HO} solar rechargeable galvanic cell has been constructed.

Perovskite Solar Cells: From the Laboratory to the Assembly Line

“…The fabrication of cheap and large‐area PSCs in also fundamental for the design of energy conversion/storage integrated devices, especially when PSCs should recharge batteries or supercapacitors . More broadly, photovoltaics is the ideal interface for many current technologies …”

“…[148][149][150][151] More broadly,p hotovoltaics is the ideal interface for many current technologies. [152][153][154][155][156][157][158][159][160][161]…”

Experimental and Theoretical Investigation of the Mechanism of the Reduction of O2 from Air to O22– by VIVO2+–N,N,N-Amidate Compounds and Their Potential Use in Fuel Cells

“…These data show that an inexpensive functional cell can be made by employing Hbpq as an intermediate of V IV OSO 4 ·3.5H 2 O oxidation, which instead of using H 2 O 2 , generates H 2 O 2 in situ from atmospheric O 2 . Another striking feature of the present cell is that it does not require solar light or other source of energy for the production of H 2 O 2 , allowing power production development through this technology to be compact, cost-effective, and durable. ,, …”

“…Another striking feature of the present cell is that it does not require solar light or other source of energy for the production of H 2 O 2 , allowing power production development through this technology to be compact, cost-effective, and durable. 9 , 18 , 114 …”

Crystal structure studies and Hirshfeld surface analysis of 4-(dimethylazaniumyl)-2-hydroxyanilinium dichloride monohydrate at 90 K

“…The further restriction of having two C-bound groups attached to the 4-N nitrogen returned 15 entries (13 unique), but with the Cbound groups both specified as methyl there were no matches. Of the 13 unique structures only one, XAVKAJ [(C 30 H 32 N 6 O 2 ) 4+ •4Cl À •4H 2 O; Stylianou et al, 2017] is a salt or a hydrate, but it has little else in common with I. Two other anilinium salts not returned in the above search but that share similar features to I are POMXUL (Smirani & Rzaigui, 2009), or 2,5-dimethylanilinium chloride monohydrate (C 8 H 12 N + •Cl À •H 2 O) and PAXXIX (Devi et al, 2012), which is 4-[(E)-(hydroxyimino)methyl]-N,N-dimethyl anilinium chloride (C 9 H 13 N 2 O + •Cl À ).…”