Spectroscopic characterization of the structural properties of quinoxalinophenanthrophenazine thin films

Frątczak, E.Z.; Makowski, Tomasz; Moustafa, Rasha M.; El‐Assaad, Tarek H.; Moneta, Marek; Uznański, Paweł; Kaafarani, Bilal R.

doi:10.1039/c7tc04757f

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…In 2018, thin films of two pyrazaacenes, C15.4c and its dodecyloxy-substituted derivative C15.5 , on silicon/native silica (Si/SiO 2 ) native and fused silica substrates were analyzed with respect to their microstructural and anisotropic optical properties ( Chart 15 ). 302 Because of solubility differences, thin films of C15.4c were obtained by organic molecular beam deposition in ultrahigh vacuum conditions, while C15.5 layers were produced from solution by spin coating. The two films exhibited different textures, each with strongly uniaxial anisotropy.…”

Section: Pyrenoidsmentioning

confidence: 99%

Recent Advances in Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds

et al. 2021

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Section: Pyrenoidsmentioning

confidence: 99%

Recent Advances in Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds

et al. 2021

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“…Equally favourable are its high thermal and chemical stability, absorption in the visible range, and strong fluorescence. QPP derivatives have mainly been studied as organic semiconductors [159][160][161][162][163][164][165] and as an active material in optical sensors. [166,167] In combination with triptycene, QPP has recently been reported as a versatile building block for porous crystalline materials [168][169][170] and for organogelators.…”

Section: Mesomorphic Quinoxalinophenanthrophenazine (Qpp)mentioning

confidence: 99%

Columnar Mesomorphism of Board‐Shaped Perylene, Diketopyrrolopyrrole, Isoindigo, Indigo, and Quinoxalino‐Phenanthrophenazine Dyes

et al. 2021

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The properties of organic dyes depend as much on their intermolecular interactions as on their molecular structure. While it is generally predictable what supramolecular structure would be ideal for a specific application, the generation of specific supramolecular structures by molecular design and suitable processing methods remains to be a challenge. A versatile approach to different supramolecular structures has been the application of mesomorphism in conjunction with alignment techniques and self‐assembly at interfaces. Reviewed here is the columnar mesomorphism of board‐shaped dyes perylene, indigo, isoindigo, diketopyrrolopyrrole, and quinoxalinophenanthrophenazine. They generate a larger number of different supramolecular structures than conventional disc‐shaped (discotic) mesogens because of their non‐circular shape and directional intermolecular interactions. The mesomorphism of all but the perylene derivatives is systematically and comprehensively covered for the first time.

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“…e capacities of electron charging and recharging processes of NOM is related to redox conditions (E h ) [10] and redox-active functional groups (RAFGs). NOM varies greatly in chemical and structural properties and thus change reactivity in the soil environment [11][12][13] that evolves from oxygen reducing to methanogenic (low reducing condition). RAFGs of NOM, including coexistence of electron donor moieties (e.g., phenolic and possibly substituted aromatic carboxylic acid groups) [14][15][16] and electron acceptor moieties (e.g., carbonyl-containing groups) [17][18][19], are responsible for cycling of electron charge-recharge within redox reactions [3,[20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Assessing Redox Properties of Natural Organic Matters with regard to Electron Exchange Capacity and Redox-Active Functional Groups

Yang

Wang

et al. 2020

Journal of Chemistry

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Redox processes in groundwater play an important role in bioavailability, toxicity, and mobility of redox-active elements and contaminants. A recent study has demonstrated that low-molecular-weight fraction (LMWF) of humic substances with great number of redox-active functional groups (RAFGs) exhibits great reducing capacity. However, whether LMWF of natural organic matter (NOM) exhibits high redox capacity still remains unclear. Therefore, this study extracted Pahokee peat NOM (PPNOM) and Leonardite NOM (LNOM) from soils, and then LMWFs in these NOMs were collected using a dialysis method. Electron exchange capacities (EEC) and RAFGs of LMWF NOMs at different Eh were analyzed using a novel electrochemical method and a three-dimensional excitation emission fluorescence (3DEEM) spectroscopy. We found that the reducing capacity in LMWF PPNOM was approximately 5-6 times higher than the bulk NOM, while only 7.8% LMWF PPNOM was accounted for in the bulk NOM. An increasing in EEC (EAC + EDC, where EAC is the electron accepting capacity and EDC is the electron donating capacity) of LMWF PPNOM and LNOM with Eh reduced from −0.49 V to −0.69 V. Additionally, an obvious increase in fluorescent intensities of quinone-like fluorophores before and after being reduced LMWF LNOM is responsible for high EAC of LMWF LNOM. These findings provide a better understanding of relationship between RAFGs Eh in LMWF of NOM, further helping in predicting and protection of groundwater environment and fate of transformation and transport for redox-active contaminants in groundwater.

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Spectroscopic characterization of the structural properties of quinoxalinophenanthrophenazine thin films

Abstract: Thin film structural features of TQPP-Me and TQPP-OC12 as explored by spectroscopic and ellipsometric techniques.

Cited by 5 publications

References 44 publications

Recent Advances in Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds

Recent Advances in Heterocyclic Nanographenes and Other Polycyclic Heteroaromatic Compounds

Columnar Mesomorphism of Board‐Shaped Perylene, Diketopyrrolopyrrole, Isoindigo, Indigo, and Quinoxalino‐Phenanthrophenazine Dyes

Assessing Redox Properties of Natural Organic Matters with regard to Electron Exchange Capacity and Redox-Active Functional Groups

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