Substituent influence on the fluorescence spectra of 2,3-diphenylbenzo[b]furan derivatives

Cires, Lenuta; Ofenberg, H.; Nicolaescu, T; Craita, Cotinica; Pollet, Alain

doi:10.1016/s0022-2313(98)00023-4

Cited by 5 publications

(8 citation statements)

References 4 publications

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“…The averaged fluorescence lifetimes obtained for derivative 1 ( τ av =0.91 ns) and derivative 2 (τ av =1.93 ns) correlate well with the ratio of the quantum yields at the excitation wavelength of λ =375 nm (Figure S5 b, Table S4 in the Supporting Information). The reason for the observed phenomena is probably electron or energy transfer between the benzofuran moiety and the aromatic rings or an intermolecular proton transfer because in the literature it has been observed that the solvent, pH, and the substitution pattern cause variations in fluorescence spectra with similar structural features 25. 26 More specific studies of the reasons, however, are beyond the scope of this paper.…”

Section: Resultsmentioning

confidence: 90%

“…Mono‐crown derivatives 1 and 2 exhibit the same spectral features: two main absorption bands at λ =284 ( 2 ) and 290 nm ( 1 ) and a shoulder at λ =325 to 350 nm. The slight shift ( λ =6 nm) in the maximum absorption band of 1 is due to a bathochromic shift, that is, a redshift caused by the longer conjugated system 25. In addition, unlike 2,3‐benzofuran and mono‐crown derivative 2 , benzofuran mono‐crown 1 possesses another shoulder at around λ =450 nm.…”

Section: Resultsmentioning

confidence: 99%

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Photo‐Hydrogen‐Evolving Molecular Catalysts Consisting of Polypyridyl Ruthenium(II) Photosensitizers and Platinum(II) Catalysts: Insights into the Reaction Mechanism

Ozawa

Kobayashi

Balan

et al. 2010

Chemistry An Asian Journal

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The mechanism of photoinduced hydrogen evolution from water driven by the first photo-hydrogen-evolving molecular catalyst (1), given by a coupling of [Ru(bpy)(2)(5-amino-phen)](2+) and [PtCl(2)(4,4'-dicarboxy-bpy)] (bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline), was investigated in detail. The H(2) evolution rate was found to obey Michaelis-Menten enzymatic kinetics with regard to the concentration of EDTA (ethylenediamine tetra-acetic acid disodium salt, sacrificial electron donor), which indicates that an ion-pair formation between the dicationic 1 and the dianionic form of EDTA (pH 5) is a key step leading to H(2) formation. A 2:1 coupling product of 1 and ethylenediamine (i.e., a {Ru(II) (2)Pt(II) (2)} complex 2) was found to show significantly higher photo-hydrogen-evolving (PHE) activity than 1, which revealed the validity of the bimolecular activation proposed in our previous study. The PHE activity of 2 was also observed to be linear to the concentration of 2, which indicates that H(2) formation through the intermolecular path competes with the intramolecular path. Molecular orbital diagrams, conformational features, and PtH(water or acetic acid) hydrogen bonds were characterized by DFT calculations.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Photo‐Hydrogen‐Evolving Molecular Catalysts Consisting of Polypyridyl Ruthenium(II) Photosensitizers and Platinum(II) Catalysts: Insights into the Reaction Mechanism

Ozawa

Kobayashi

Balan

et al. 2010

Chemistry An Asian Journal

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“…red shift caused by the longer conjugated system. [25] In addition, unlike 2,3-benzofuran and mono-crown derivative 2, benzofuran mono-crown 1 possesses another shoulder around 450 nm. The absorption coefficients (ε, .…”

Section: Absorption Spectramentioning

confidence: 99%

“…The reason for the observed phenomena is probably electron or energy transfer between the benzofuran moiety and the aromatic rings, or an intermolecular proton transfer since in the literature it has been observed that the solvent, pH, and the substitution pattern cause variations to the fluorescence spectra with similar structural features. [25,26] More specific studies of the reasons, however, are out of the scope of this paper.…”

Section: Absorption Spectramentioning

confidence: 99%

The Structural Diversity of Benzofuran Resorcinarene Leads to Enhanced Fluorescence

Tero

Salorinne

Lehtivuori

et al. 2014

Chemistry An Asian Journal

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An unexpected and previously unknown resorcinarene mono‐crown with a fused benzofuran moiety in its macrocyclic core was obtained as a byproduct from a bridging reaction of tetramethoxy resorcinarene with tetraethylene glycol ditosylate. The formation of the fused benzofuran moiety in the resorcinarene macrocycle resulted in a unique rigid and puckered boat conformation, as shown by XRD studies in the solid state. Modification of the macrocycle was also observed to affect the photophysical properties in solution by enhancing the fluorescence brightness compared with a conventional resorcinarene macrocycle. The fluorescent properties enabled unique detection of structural features, that is, the rigid boat conformation with the conjugated benzofuran system and the more flexible crown bridge part, in solution.

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“…Benzimidazol türevleri korozyon yavaşlatıcısı olarak da kullanılmaktadır [11]. Tüm bunların yanında bazı benzimidazol türevlerinin lüminesans özellikleri de belirlenmiştir [12].…”

Section: Introductionunclassified

[Ni(2-Benzimidazol-il-üre)2(etanol)2][NO3]2 Bileşiğinin Yoğunluk Fonksiyoneli Teorisi Kullanılarak Yapılan Bazı Kuantum Kimyasal Hesaplamaları

Irak

Poyraz

2019

Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi

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Özet: Bu çalışmada, moleküler yapısı tek bir kristal X-ışınım yöntemi ile belirlenen [Ni(2-Benzimidazol-il-üre) 2 (etanol) 2 ][NO 3 ] 2 bileşiğinin teorik hesaplamaları yapılmıştır. Teorik hesaplamalarda elde edilen optimize geometri, dipol moment gibi birçok özellik deneysel değerlere oldukça yakın sonuçlar göstermiştir. Bunların dışında bileşiğin gaz fazında sınır orbitalleri, hesaplanan sınır orbitallerin enerjilerinden elektronik yapı tanımlayıcıları, moleküler elektrostatik potansiyel haritası, doğrusal olmayan optik özellikleri hesaplanmış ve yorumlanmıştır. Çalışmanın birçok organometal kompleksin moleküler özelliğine ışık tutacağı düşünülmektedir. Yoğunluk Fonksiyonel Teorisi (YFT), Gaussian 09W programı kullanılarak hesaplama yöntemi olarak seçilmiştir ve kompleks için B3LYP/LANL2DZ seviyesinde optimize edilmiş gaz faz kuantum mekaniksel verileri elde edilmiştir. Abstract:The theoretical calculations of the [Ni(2-Benzimidazoly-urea) 2 (ethanol) 2 ] [NO 3 ] 2 compound, whose molecular structure was determined with a single crystal X-ray diffraction method, was conducted. Many properties such as optimized geometry and dipole moment obtained in theoretical calculations showed very approximate to experimental values. Apart from these, the frontier orbitals of the compound in the gas phase, the electronic structure parameters from the energies of the calculated frontier orbitals, molecular electrostatic potential map, non-linear optical properties were calculated and interpreted. It is thought that the study will shed light on the molecular property of many organometal complexes. The Density Functional Theory (DFT) was selected as a computational method using the Gaussian 09W program, and the optimized gase phase quantum mechanical data for the complex was obtained in the B3LYP/LANL2DZ level with gen keyword.

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Substituent influence on the fluorescence spectra of 2,3-diphenylbenzo[b]furan derivatives

Cited by 5 publications

References 4 publications

Photo‐Hydrogen‐Evolving Molecular Catalysts Consisting of Polypyridyl Ruthenium(II) Photosensitizers and Platinum(II) Catalysts: Insights into the Reaction Mechanism

Photo‐Hydrogen‐Evolving Molecular Catalysts Consisting of Polypyridyl Ruthenium(II) Photosensitizers and Platinum(II) Catalysts: Insights into the Reaction Mechanism

The Structural Diversity of Benzofuran Resorcinarene Leads to Enhanced Fluorescence

[Ni(2-Benzimidazol-il-üre)2(etanol)2][NO3]2 Bileşiğinin Yoğunluk Fonksiyoneli Teorisi Kullanılarak Yapılan Bazı Kuantum Kimyasal Hesaplamaları

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